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• Disk IO causing high load on Xen/CentOS guest

  - by Peter Lindqvist

  I'm having serious issues with a xen based server, this is on the guest partition. It's a paravirtualized CentOS 5.5. The following numbers are taken from top while copying a large file over the network. If i copy the file another time the speed decreases in relation to load average. So the second time it's half the speed of the first time. It needs some time to cool off after this. Load average slowly decreases until it's once again usable. ls / takes about 30 seconds. top - 13:26:44 up 13 days, 21:44, 2 users, load average: 7.03, 5.08, 3.15 Tasks: 134 total, 2 running, 132 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.1%sy, 0.0%ni, 25.3%id, 74.5%wa, 0.0%hi, 0.0%si, 0.1%st Mem: 1048752k total, 1041460k used, 7292k free, 3116k buffers Swap: 2129912k total, 40k used, 2129872k free, 904740k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1506 root 10 -5 0 0 0 S 0.3 0.0 0:03.94 cifsd 1 root 15 0 2172 644 556 S 0.0 0.1 0:00.08 init Meanwhile the host is ~0.5 load avg and steady over time. ~50% wait Server hardware is dual xeon, 3gb ram, 170gb scsi 320 10k rpm, and shouldn't have any problems with copying files over the network. disk = [ "tap:aio:/vm/dev01.img,xvda,w" ] I also get these in the log INFO: task syslogd:1350 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syslogd D 00062E4F 2208 1350 1 1353 1312 (NOTLB) c0ef0ed0 00000286 6e71a411 00062e4f c0ef0f18 00000009 c0f20000 6e738bfd 00062e4f 0001e7ec c0f2010c c181a724 c1abd200 00000000 ffffffff c0ef0ecc c041a180 00000000 c0ef0ed8 c03d6a50 00000000 00000000 c03d6a00 00000000 Call Trace: [<c041a180>] __wake_up+0x2a/0x3d [<ee06a1ea>] log_wait_commit+0x80/0xc7 [jbd] [<c043128b>] autoremove_wake_function+0x0/0x2d [<ee065661>] journal_stop+0x195/0x1ba [jbd] [<c0490a32>] __writeback_single_inode+0x1a3/0x2af [<c04568ea>] do_writepages+0x2b/0x32 [<c045239b>] __filemap_fdatawrite_range+0x66/0x72 [<c04910ce>] sync_inode+0x19/0x24 [<ee09b007>] ext3_sync_file+0xaf/0xc4 [ext3] [<c047426f>] do_fsync+0x41/0x83 [<c04742ce>] __do_fsync+0x1d/0x2b [<c0405413>] syscall_call+0x7/0xb ======================= I have tried disabling irqbalanced as suggested here but it does not seem to make any difference.

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• Why is my new Phenom II 965 BE not significantly faster than my old Athlon 64 X2 4600+?

  - by Software Monkey

  I recently rebuilt my 5 year old computer. I upgraded all core components, in particular from an Athlon 64 X2 4600+ at 2.4 GHz with DDR2 800 to a Phenom II 965 BE (quad core) at 3.6 GHz with DDR3 1333 (actually 1600, but testing consistently detected memory errors at 1600). The motherboard is also much newer and better. The HDD's (x3), DVD writer and card reader are the same. The BIOS memory config is auto-everything except the base timing which I overrode to 1T instead of 2T. The BIOS CPU multiplier is slightly over-clocked to 3.6 GHz from the stock 3.4 GHz. I noticed compiling Java is slower than I expected. As it happens I have some (single-threaded) Java pattern-matching code which is CPU and memory bound and for which I have performance numbers recorded on a number of hardware platforms, including my old system. So I did a test run on the new equipment and was stunned to find that the numbers are only slightly better than my old system, about 25%. The data set it is operating on is a 148,975 character array, which should easily fit in caches, but in any event the new CPU has larger caches all around. The system was, of course, otherwise idle for the test and the test run is a timed 10 seconds to eliminate scheduling anomalies. A long while ago, when I upgraded only memory from DD2 667 to DDR2 800 there was no change in performance of this test, which subjectively supports that the test cycle does not need to (significantly) access main memory, but yes it is creating and garbage collecting a large number of objects in the process of this test (low millions of matches are found for the pattern set). I am about 99.999% certain the code hasn't changed since I last ran it on 2009-03-17 - but I can't easily retest the old hardware, because it is currently in pieces on my work-bench waiting to be built into a new computer for my kids. Note that Windows (XP) reports a CPU speed of 795 MHz unless I have some thing running. With stuff running it seems to jump all over the place each time I use ALT-Pause to display the system properties, everywhere from 795 MHz to 3.4 Ghz. So why might my shiny new hardware under-performing so badly? EDIT: The old memory was Mushkin DDR2 800 with timings set for auto which should have been 5-5-5-12. The new memory is Corsair DDR3 1600, running at 1333 with timings also auto which are 9-9-9-21. In both cases they are a paired set of dual channel DIMMs. I was waiting to ensure my system was stable before tweaking with memory timings.

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• 64-bit linux kernel only seeing 3 of 4GB after upgrade...

  - by Blaine

  Hey everyone. I am running Ubuntu 9.04 64-bit on my macbook. I had 2GB of ram before, and everything ran great. I just upgraded to 2x2GB (4GB), but my system only sees 3GB of it. OS X, which I am dual booting, sees all 4GB. Also, my video performance is incredibly lacking. Before the upgrade my compiz benchmark was full at 80fps, and now it is at 22fps with very choppy window dragging. Has anyone ever heard of this on a 64-bit kernel? I just don't quite understand what could be the issue. 10$ uname -a Linux macbook 2.6.28-15-generic #49-Ubuntu SMP Tue Aug 18 19:25:34 UTC 2009 x86_64 GNU/Linux $ free -m total used free shared buffers cached Mem: 2953 1031 1921 0 114 427 -/+ buffers/cache: 489 2463 Swap: 7812 0 7812 9$ lsmod Module Size Used by i915 77960 2 drm 123232 3 i915 binfmt_misc 18572 1 ppdev 16904 0 btusb 21784 2 bridge 63776 0 stp 11140 1 bridge bnep 22912 2 vboxnetadp 109356 0 vboxnetflt 116972 0 vboxdrv 1721612 1 vboxnetflt uvcvideo 69640 0 compat_ioctl32 18304 1 uvcvideo videodev 45184 2 uvcvideo,compat_ioctl32 v4l1_compat 23940 2 uvcvideo,videodev lp 19588 0 parport 49584 2 ppdev,lp snd_hda_intel 557492 3 snd_pcm_oss 52352 0 snd_mixer_oss 24960 1 snd_pcm_oss snd_pcm 99464 2 snd_hda_intel,snd_pcm_oss arc4 10240 2 snd_seq_dummy 11524 0 ecb 11392 2 snd_seq_oss 41984 0 snd_seq_midi 15744 0 snd_rawmidi 33920 1 snd_seq_midi snd_seq_midi_event 16512 2 snd_seq_oss,snd_seq_midi snd_seq 66272 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event ath9k 310584 0 snd_timer 34064 2 snd_pcm,snd_seq snd_seq_device 16276 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq mac80211 251528 1 ath9k iTCO_wdt 21712 0 iTCO_vendor_support 12420 1 iTCO_wdt joydev 20992 0 video 29204 0 snd 78920 15 snd_hda_intel,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device applesmc 37700 0 output 11648 1 video soundcore 16800 1 snd pcspkr 11136 0 cfg80211 43680 1 mac80211 appletouch 19972 0 isight_firmware 11520 0 input_polldev 12688 1 applesmc intel_agp 39408 1 snd_page_alloc 18704 2 snd_hda_intel,snd_pcm led_class 13064 2 ath9k,applesmc hid_apple 15872 0 usbhid 47040 0 ohci1394 42164 0 ieee1394 108288 1 ohci1394 sky2 63364 0 fbcon 49792 0 tileblit 11264 1 fbcon font 17024 1 fbcon bitblit 14464 1 fbcon softcursor 10368 1 bitblit Some information from dmesg: [ 795.820163] ACPI: EC: GPE storm detected, transactions will use polling mode [ 1762.709516] [drm:i915_getparam] *ERROR* Unknown parameter 6 [ 1763.078130] [drm:i915_getparam] *ERROR* Unknown parameter 6 [ 2362.760889] [drm:i915_getparam] *ERROR* Unknown parameter 6 [ 2416.352084] ACPI: EC: missing confirmations, switch off interrupt mode. [ 3718.721095] [drm:i915_getparam] *ERROR* Unknown parameter 6 [ 3719.108914] [drm:i915_getparam] *ERROR* Unknown parameter 6 [ 4318.773266] [drm:i915_getparam] *ERROR* Unknown parameter 6 [ 9513.813066] CE: hpet increasing min_delta_ns to 15000 nsec [ 9693.815684] npviewer.bin[6736]

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• lacp, cicso 3550, 3560, help with configuration

  - by Flamewires

  Hey all this is a repost from a question I asked on the cisco forums but never got a useful reply. Hey I'm trying to convert the FreeBSD servers at work to dual-gig lagg links from regular gigabit links. Our production servers are on a 3560. I have a small test environment on a 3550. I have achieved fail-over, but am having troubles achieving the speed increase. All servers are running gig intel (em) cards. The configs for the servers are: BSDServer: #!/bin/sh #bring up both interfaces ifconfig em0 up media 1000baseTX mediaopt full-duplex ifconfig em1 up media 1000baseTX mediaopt full-duplex #create the lagg interface ifconfig lagg0 create #set lagg0's protocol to lacp, add both cards to the interface, #and assign it em1's ip/netmask ifconfig lagg0 laggproto lacp laggport em0 laggport em1 ***.***.***.*** netmask 255.255.255.0 The switches are configured as follows: #clear out old junk no int Po1 default int range GigabitEthernet 0/15 - 16 # config ports interface range GigabitEthernet 0/15 - 16 description lagg-test switchport duplex full speed 1000 switchport access vlan 192 spanning-tree portfast channel-group 1 mode active channel-protocol lacp **** switchport trunk encapsulation dot1q **** no shutdown exit interface Port-channel 1 description lagginterface switchport access vlan 192 exit port-channel load-balance src-mac end obviously change 1000's to 100's and GigabitEthernet to FastEthernet for the 3550's config, as that switch has 100Mbit speed ports. With this config on the 3550, I get failover and 92Mbits/sec speed on both links, simultaneously, connecting to 2 hosts.(tested with iperf) Success. However this is only with the "switchport trunk encapsulation dot1q" line. First, I do not understand why I need this, I thought it was only for connecting switches. Is there some other setting which this turns on that is actually responsible for the speed increase? Second, This config does not work on the 3560. I get failover, but not the speed increase. Speeds drop from gig/sec to 500Mbit/sec when I make 2 simultaneous connections to the server with or without the encapsulation line. I should mention that both switches are using source-mac load balancing. In my test I am using Iperf. I have the server(lagg box) setup as the server(iperf -s), and the client computers are client(iperf -c server-ip-address), so the source mac(and IP) are different for both connections. Any ideas/corrections/questions would be helpful, as the gig switches are what I actually need the lagg links on. Ask if you need more information.

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• No login prompt displayed after updating Ubuntu 10.04, broken gdm

  - by cliff

  So here's what happens: I updated my system the other day, was prompted for a reboot for the update to complete but was in the middle of working so I delayed it until after I was done. I reboot and it's broken :(. It appears to boot normally, with the following exceptions: The purple Ubuntu load screen no longer displays (though it did for the first couple of times I tried to get in). I hear the login prompt sound, but no login prompt appears. Nor is it simply "invisible" - pressing enter, typing my password, and pressing enter again do nothing. Normally my Bluetooth mouse is functional at this point, but it is not. GRUB displays recovery options for my current kernel, and for an older one (2.6.32-24). Trying to boot into .32-24 gives me an error saying "udevadm can't do something while udev is not configured". So I try solutions listed here: http://superuser.com/questions/195786/ubuntu-update-went-wrong-pc-doesnt-boot-how-can-i-repair-it Nothing I tried seemed to work, and after further Googling my hunch is that it's a problem with gdm. Please correct me if I'm wrong, I don't know all that much about how Linux/Ubuntu systems work just yet. Things I'm able to do: Boot to a live CD Ctrl-Alt-F2 after that login sound plays brings me to a console login, which I can successfully do (it's how I tried the solutions above). This works only under the current kernel. A hack I'd be willing to explore is removing the login prompt from the console, but I'd prefer to "simply" fix what's wrong. Like that guy, I need to repair the system rather than reinstall. System: Dell Inspiron 1525 Core 2 Duo Proprietary Driver for Broadcom 43xx wireless Dual-boot with Windows 7 (which is how I'm posting this, unfortunately I only have this machine and any experimenting requires constant reboots into Windows/brokenbuntu) Last package installed was Moonlight, but it appeared to install properly. Kernel: 2.6.32-25 Edit: After working with Karl's suggestions, it seems that the problem is with gdm. Error exit status 245 when attempting to sudo apt-get install --reinstall gdm, also an error processing gdm when running sudo apt-get -f install. How do I reinstall or repair gdm so that I can get back into my machine?

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• Why might one host be unable to access the Internet, when it can ping the router and when all other hosts can?

  - by user1444233

  I have a Draytek Vigor 2830n. It's kicking out a 192.168.3.0 LAN. It performs load-balancing across dual-WAN ports, although I've turned off the second WAN to simplify testing. There are many hosts on the LAN. All IPs are allocated through DHCP, most freely allocated from the pool, but one or two are bound to NIC MAC addresses. All hosts can access the Internet, save one. That host (192.168.3.100 or 'dot100' for short) gets allocated an IP address (and the right gateway address, DNS server addresses, subnet etc.) dot100 can ping itself. It can ping the gateway, and access the latter's web interface via port 80. It's responsive and loss-free (sustained ping over a couple of minutes reports no data loss). Yet, for some reason that evades me, dot100 can't ping an external IP address or domain name. I suspect it's never been able to, because it was getting some Internet access from a second adaptor (different subnet), but that's now been turned off, which exposed the problem. In dot100, I've tried: two operating systems (Windows 8 and Knoppix), to rule out anti-virus programs etc. two physical adaptors two cables, on each adaptor two IPs (e.g. .100 and .103 assigned by Mac and .26 from the pool) both dynamic and assigned (MAC-bound) DHCP-allocated IPs but none of this experiments yielded any variation in the result. dot100 is a crucial host. It's a file server for the network, so I need it to be reliably allocated a consistent IP. Can anyone offer a potential solution or a way forward with the analysis please? My guess My analysis so far leads me to believe it's a router issue. I've checked the web interface very carefully. There are no filters setup in Firewall - General Setup or Filter Setup. I suspect it's a corrupted internal routing table, but the web UI shows this as the Routing table: Key: C - connected, S - static, R - RIP, * - default, ~ - private * 0.0.0.0/ 0.0.0.0 via 62.XX.XX.X WAN1 * 62.XX.XX.X/ 255.255.255.255 via 62.XX.XX.X WAN1 S 82.YY.YYY.YYY/ 255.255.255.255 via 82.YY.YYY.YYY WAN1 C 192.168.1.0/ 255.255.255.0 directly connected WAN2 C~ 192.168.3.0/ 255.255.255.0 directly connected LAN2

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• New monitor connected to HDMI adaptor doesn't show output after booting

  - by Paul

  Hello out there in the multiple monitors’ world. I am a very old newbie in your world and need help. I just purchased a new Asus VH236H monitor and hooked it up the HDMI port of an ATI Radeon HD4300 / 4500 Series display adaptor. I left the old Princeton LCD19 (TMDS) hooked up to the DVI port of the same display adaptor. Both monitors displayed the boot sequence, after I fired good old Sarastro2 (Asus P5Q Pro Turbo – Dual Core E5300 – 2.60 GHz) up. The Asus lacked one half of a second behind the Princeton until the Windows 7 Ultimate SP 1 boot up was complete. Then the Asus displayed “HDMI NO SIGNAL” and went into hibernation. The Princeton stayed lit up as before. Both monitors are displayed on the “Screen Resolution Setup Display” and I plaid around with them for a while. The only thing I accomplished was to shove the desktop icons from the Princeton to the still hibernating Asus. The “Multiple displays:” is set to “Extend these displays”, the Orientation is “Landscape” and the Resolutions are set on both to the “recommended” one. Both monitors show that they work properly in the advanced Properties display. What am I doing wrong, what am I missing? Never mind the opinions about the different resolutions of the two monitors. I always can unhook the Princeton and give it to a Goodwill Store if I do not like the setup. I just would like to make it work. Any constructive help is very much appreciated, Thank you. Thank you Anees Bakrain Only the ATI Radeon HD 4300/4500 Series adapter is displayed in the Device Manager, for that reason I have to assume that the onboard display adaptor is not active. All 40 drivers of Sarastro2 are up to date and the HDMI cable can not be the problem because both monitors displayed the boot sequence up to the moment when Windows 7 was loaded completely. This was the moment, when the Asus monitor lost its signal. Both connectors, HDMI and DVI are connected and removing the DVI connector would not solve my problem of running both monitors simultaneously. However, your suggestions shifted my seventy one year old brain into the next gear. The only question remaining is; “Why the signals to the Asus monitor stop after the sequence is complete”. The ATI Radeon HD 4300/4500 Series adapter seems to be capable of sending simultaneous HDMI and DVI signals, what is done during the boot sequence. Why do the signals change after the boot sequence is complete is the key question or der springende Punkt? Is this a correct assumption slhck?

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• JNDI Datasource definition in Tomcat 6.0

  - by romaintaz

  I want to define a DataSource to an Oracle database on my Tomcat 6.0. So, in conf/server.xml (yes, I know that this DataSource will be available for all the webapps in Tomcat, but it's not a problem here), I've set this Resource: <GlobalNamingResources> <Resource name="hibernate/HibernateDS" auth="Container" type="javax.sql.DataSource" url="jdbc:oracle:thin:@myserver:1542:foo" username="foo" password="bar" driverClassName="oracle.jdbc.OracleDriver" maxActive="50" maxIdle="10" validationQuery="select 1 from dual"/> Then, in the web.xml of my application, I set a resource-ref element: <resource-ref> <description>Hibernate Datasource</description> <res-ref-name>hibernate/HibernateDS</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref> Finally, as Hibernate is used to manage the database connection, I have a webapps/mywebapp/WEB-INF/classes/hibernate.cfg.xml that creates a session-factory using the JNDI DataSource: <hibernate-configuration> <session-factory> <property name="connection.datasource">java:comp/env/hibernate/HibernateDS</property> ... However, when I start my Tomcat server, I get an error that says it could not create the INFO [net.sf.hibernate.util.NamingHelper] JNDI InitialContext properties:{} INFO [net.sf.hibernate.connection.DatasourceConnectionProvider] Using datasource: java:comp/env/hibernate/HibernateDS INFO [net.sf.hibernate.transaction.TransactionFactoryFactory] Transaction strategy: net.sf.hibernate.transaction.JDBCTransactionFactory INFO [net.sf.hibernate.transaction.TransactionManagerLookupFactory] No TransactionManagerLookup configured (in JTA environment, use of process level read-write cache is not recommended) WARN [net.sf.hibernate.cfg.SettingsFactory] Could not obtain connection metadata org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null' at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1150) at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880) at net.sf.hibernate.connection.DatasourceConnectionProvider.getConnection(DatasourceConnectionProvider.java:59) at net.sf.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:84) at net.sf.hibernate.cfg.Configuration.buildSettings(Configuration.java:1172) ... Caused by: java.lang.NullPointerException at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(JdbcOdbcDriver.java:507) at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(JdbcOdbcDriver.java:476) at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(JdbcOdbcDriver.java:307) at java.sql.DriverManager.getDriver(DriverManager.java:253) at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1143) ... 11 more Do you have any idea why Hibernate is not able to construct the session-factory? What is wrong in my configuration?

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• Different files on shared partition?

  - by Matt Robertson

  I am dual-booting Windows 8 and Ubuntu 12.04. My partition scheme looks like this: /dev/sda1 - Windows 8 (nfts) /dev/sda2 - Ubuntu / (ext4) /dev/sda3 - Ubuntu home (ext4) /dev/sda5 - swap /dev/sda6 - Shared data partition (exfat) (First off, yes I do have exfat libraries installed on Ubuntu) I created some PNG images in Windows and saved them on my shared partition. From Ubuntu, I edited the images in GIMP and saved them (replacing the ones on the shared partition). When I boot into Windows, the files appear unchanged - exactly like they did before I edited them from Ubuntu. I even added a folder and deleted some other files, but none of these changes exist in Windows. When I boot into Ubuntu, all of the changes are still there. It is as if Windows is caching the old file structure... How is this possible? Thanks in advance. Edit -- commands output ~~ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 465.8G 0 disk +-sda1 8:1 0 165.1G 0 part +-sda2 8:2 0 21.3G 0 part / +-sda3 8:3 0 98.9G 0 part /home +-sda4 8:4 0 1K 0 part +-sda5 8:5 0 7.8G 0 part [SWAP] +-sda6 8:6 0 172.7G 0 part /mnt/shared_data ~~ /etc/fstab # <file system> <mount point> <type> <options> <dump> <pass> proc /proc proc nodev,noexec,nosuid 0 0 # /dev/sda2 UUID=8f700f65-b5c7-4afc-a6fb-8f9271e0fb5e / ext4 errors=remount-ro 0 1 # /dev/sda3 UUID=f0d688b7-22bd-4fa7-bc1b-a594af2933fa /home ext4 defaults 0 2 # /dev/sda5 UUID=3bc2399b-5deb-4f04-924b-d4fc77491997 none swap sw 0 0 # /dev/sda6 UUID=F2DE-BC47 /mnt/shared_data exfat defaults 0 3 ~~ /etc/mtab /dev/sda2 / ext4 rw,errors=remount-ro 0 0 proc /proc proc rw,noexec,nosuid,nodev 0 0 sysfs /sys sysfs rw,noexec,nosuid,nodev 0 0 none /sys/fs/fuse/connections fusectl rw 0 0 none /sys/kernel/debug debugfs rw 0 0 none /sys/kernel/security securityfs rw 0 0 udev /dev devtmpfs rw,mode=0755 0 0 devpts /dev/pts devpts rw,noexec,nosuid,gid=5,mode=0620 0 0 tmpfs /run tmpfs rw,noexec,nosuid,size=10%,mode=0755 0 0 none /run/lock tmpfs rw,noexec,nosuid,nodev,size=5242880 0 0 none /run/shm tmpfs rw,nosuid,nodev 0 0 /dev/sda3 /home ext4 rw 0 0 /dev/sda6 /mnt/shared_data fuseblk rw,nosuid,nodev,allow_other,blksize=4096 0 0 binfmt_misc /proc/sys/fs/binfmt_misc binfmt_misc rw,noexec,nosuid,nodev 0 0 gvfs-fuse-daemon /home/matt/.gvfs fuse.gvfs-fuse-daemon rw,nosuid,nodev,user=matt 0 0

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• Why is the server performance so poor? What can be done to improve the speed of the server?

  - by fslsyed

  Very slow processing using Windows Server2008 R2 Standard with Service Pack One. Situation: Read a text file using the text data to populate a series of MS Sql tables. The converted data is used to generate monthly PDF invoice files; the PDF files are saved directly to the hard drive. The application is multi-threading with one thread used for the text conversion and three threads for PDF invoice generation. The text conversion is occurring concurrently with the invoice generation. Application Software: C# using Microsoft Visual Studio 2010 Ultimate. Crystal Report Writer 2011 with runtime 13_0_3 64 bit version. Targeted platform is x64; also tested as x86, and Any CPU with similar results. Microsoft .NET Framework 4.0. Microsoft Sql 2008 Issue: The software is running very slowly. The conversion of the text file is approximately six hundred fifty records per second and generation of the PDF files is approximately twelve invoices per minute. The text file to be converted is six hundred Meg with seven thousand invoices to be generated. The software was installed on three different machines from the same distribution files. The same text file was converted on each machine. The user executing the application was an administrator on each machine. The only variances were the machine and operating system. The configurations are as follows: Server: Operating System: Windows Server2008 R2 Standard 64-bit (6.1, Build7601) SP1 Service Pack: System Manufacturer: IBM System Model: System x3550 M3-[7944AC1]- BIOS: Default System BIOS Processor: Intel® Xeon® CPU E5620@ 2.4GHz (16 CPUs) Memory: 16384MB Notebook: Operating System: Windows 7 Home Premium Standard 64-bit (6.1, Build7601) System Manufacturer: Hewlett-Packard System Model: HP Pavilion dv7 Notebook PC BIOS: Default System BIOS Processor: AMD Phenom II N640 Dual-Core Processor 2.9GHz (2 CPUs) Memory: 6144MB Desktop: Operating System: Windows 7 Professional 64-bit (6.1, Build7601) SP1 System Manufacturer: Dell Inc. System Model: OptiPlex 960 BIOS: Phoenix ROM BIOS PLUS Version 1.10 A11 Processor: Intel Core™2 Quad CPU Q9650 @3.00GHZ (4 CPUs) Memory: 16384MB Processing results per machine: The applications were executed seven times with the averages being displayed below. Machine Text Records Invoices Generated Converted Per Minute Per Minute Server (1) 650 12 Notebook 980 17 Desktop 2,100 45 (1) The server is dedicated to execution of this application; no additional applications are being executed. Question: Why is the server performance so poor? What can be done to improve the speed of the server?

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• JNDI Datasource definition in Tomcat 6.0

  - by romaintaz

  Hi all, I want to define a DataSource to an Oracle database on my Tomcat 6.0. So, in conf/server.xml (yes, I know that this DataSource will be available for all the webapps in Tomcat, but it's not a problem here), I've set this Resource: <GlobalNamingResources> <Resource name="hibernate/HibernateDS" auth="Container" type="javax.sql.DataSource" url="jdbc:oracle:thin:@myserver:1542:foo" username="foo" password="bar" driverClassName="oracle.jdbc.OracleDriver" maxActive="50" maxIdle="10" validationQuery="select 1 from dual"/> Then, in the web.xml of my application, I set a resource-ref element: <resource-ref> <description>Hibernate Datasource</description> <res-ref-name>hibernate/HibernateDS</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref> Finally, as Hibernate is used to manage the database connection, I have a webapps/mywebapp/WEB-INF/classes/hibernate.cfg.xml that creates a session-factory using the JNDI DataSource: <hibernate-configuration> <session-factory> <property name="connection.datasource">java:comp/env/hibernate/HibernateDS</property> ... However, when I start my Tomcat server, I get an error that says it could not create the INFO [net.sf.hibernate.util.NamingHelper] JNDI InitialContext properties:{} INFO [net.sf.hibernate.connection.DatasourceConnectionProvider] Using datasource: java:comp/env/hibernate/HibernateDS INFO [net.sf.hibernate.transaction.TransactionFactoryFactory] Transaction strategy: net.sf.hibernate.transaction.JDBCTransactionFactory INFO [net.sf.hibernate.transaction.TransactionManagerLookupFactory] No TransactionManagerLookup configured (in JTA environment, use of process level read-write cache is not recommended) WARN [net.sf.hibernate.cfg.SettingsFactory] Could not obtain connection metadata org.apache.tomcat.dbcp.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null' at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1150) at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880) at net.sf.hibernate.connection.DatasourceConnectionProvider.getConnection(DatasourceConnectionProvider.java:59) at net.sf.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:84) at net.sf.hibernate.cfg.Configuration.buildSettings(Configuration.java:1172) ... Caused by: java.lang.NullPointerException at sun.jdbc.odbc.JdbcOdbcDriver.getProtocol(JdbcOdbcDriver.java:507) at sun.jdbc.odbc.JdbcOdbcDriver.knownURL(JdbcOdbcDriver.java:476) at sun.jdbc.odbc.JdbcOdbcDriver.acceptsURL(JdbcOdbcDriver.java:307) at java.sql.DriverManager.getDriver(DriverManager.java:253) at org.apache.tomcat.dbcp.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1143) ... 11 more Do you have any idea why Hibernate is not able to construct the session-factory? What is wrong in my configuration?

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• Monitoring tools that can take high rate and high volume?

  - by Jon Watte

  We're using Cacti with RRDTool to monitor and graph about 100,000 counters spread across about 1,000 Linux-based nodes. However, our current setup generally only gives us 5-minute graphs (with some data being minute-based); we often make changes where seeing feedback in "near real time" would be of value. I'd like approximately a week of 5- or 10-second data, a year of 1-minute data, and 5 years of 10-minute data. I have SSD disks and a dual-hexa-core server to spare. I tried setting up a Graphite/carbon/whisper server, and had about 15 nodes pipe to it, but it only has "average" for the retention function when promoting to older buckets. This is almost useless -- I'd like min, max, average, standard deviation, and perhaps "total sum" and "number of samples" or perhaps "95th percentile" available. The developer claims there's a new back-end "in beta" that allows you to write your own function, but this appears to still only do 1:1 retention (when saving older data, you really want the statistics calculated into many streams from a single input. Also, "in beta" seems a little risky for this installation. If I'm wrong about this assumption, I'd be happy to be shown my error! I've heard Zabbix recommended, but it puts data into MySQL or some other SQL database. 100,000 counters on a 5 second interval means 20,000 tps, and while I have an SSD, I don't have an 8-way RAID-6 with battery backup cache, which I think I'd need for that to work out :-) Again, if that's actually something that's not a problem, I'd be happy to be shown the error of my ways. Also, can Zabbix do the single data stream - promote with statistics thing? Finally, Munin claims to have a new 2.0 coming out "in beta" right now, and it boasts custom retention plans. However, again, it's that "in beta" part -- has anyone used that for real, and at scale? How did it perform, if so? I'm almost thinking about using a graphing front-end (such as Graphite) and rolling my own retention backend with a simple layer on top of mmap() and some stats. That wouldn't be particularly hard, and would probably perform very well, letting the kernel figure out the balance between frequency of flushing to disk and process operations. Any other suggestions I should look into? Note: it has to have shown itself able to sustain the kinds of data loads I'm suggesting above; if you can point at the specific implementation you're referencing, so much the better!

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• Unable to boot from LiveCD/USB and even Super Grub Disk!

  - by Reuben L.

  Hi all, I'm in a fix. Basically this morning, I decided to format my Win7 as it was getting really slow and I did so with no problems. I also have a Linux Mint OS on dual boot. Since I was springcleaning my windows partition, I decided it was a good idea to do the same to my linux partition. I downloaded the latest version of Linux Mint (Julia) and burned the LiveCD. Now here is where the problem lies, when I restarted Windows and chose to boot from the LiveCD, it didn't work. No joke. There was just a little underscore blinking for a long time before it went back to GRUB which prompted me to select an OS to boot. However, when I went into my old Linux Mint OS and restarted the machine, the LiveCD worked... to a certain extent. It would load and look as though it was ready to install Linux Mint 10 but the moment it got to the option screen, the whole screen turned into a checkered and jumbled mess. At this point I thought it was the LiveCD or the .iso file. I had an Ubuntu LiveUSB for recovery purposes and I tried that. The exact same thing happened. Can't boot the LiveUSB if I restarted from Windows, but works when I reboot from Linux. BUT still the same checkered screen that doesnt respond. Did a bit of googling and reckoned it might be something wrong with my GRUB. Did some updating and didnt make a difference. Then I tried the Super Grub Disk and STUPIDLY uninstalled GRUB. (Note that booting to SGD had the exact same problem - can't be done if I rebooted from Windows). Now I can't access my Linux Mint 9 cos the the bootup screen (mbr) only has Windows 7 as an option. Remember me mentioning that I can't boot from any CD/USB/recovery CD when I reboot from Windows? And now that I can't access Linux, there's no way for me to do any form of recovery! I've tried using the command prompt utility at startup recovery but to no avail. Anyone can help me with this?

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• How to temporary disable a mirror video driver in windows xp registry

  - by happy clicker

  Because its a lot of text, I will ask first my question and then explain what the base problem is. Perhaps someone can give me a solution to the base problem: Is there is a way to temporary disable mirror video drivers (through registry or so), without uninstalling the corresponding software. I tested changing the enumeration in LocalMachine\Hardware\DeviceMap\Video but after reboot always the old configuration is restored. Explanation of the base problem We are working on a wpf-project for a department of a big company. There we have the problem that WPF renders only in software mode, although the hardware they have, must support hardware rendering (Tier 2). After searching for a solution to the problem, we found out that direct 3d does not work properly and we think thats why WPF can only use SW-rendering. In dxdiag.exe the direct3d-acceleration is enabled, but if we start the test-routine it always fails saying that it has not enough memory (it says memory, not video memory!). I have seen there 3 different types of pc’s (they have some hundreds of each type) and every type shows the exactly same behavior. We tried to update all the drivers, also dx (Version 9.0c) and we searched a lot in the web but could not find a solution. All the pcs have Intel Dual-Core processors or better, one type has an Intel gma 9000 graphics card the other two types have actual ATI and NVidia graphic-cards with 256MB onboard memory. Also the system memory is at least 2GB. Windows is XPSP3. The pc’s are of two different manufacturers. Because we see the exactly same behavior on every computer of this three very different computer-types, we don’t think that this is a driver or a direct x problem. What we’ve found in other newsgroups is, that direct x could be disturbed through mirror-video drivers such as NetMeeting, VNC and other remote desktop-installations. In the registry, we see under LocalMachine\Hardware\DeviceMap\Video a lot of such mirror-entries and we find also the definitions in the CurrentControlSet\Control\Video-Section (However this drivers are not shown in the hardware panel of the os). We can have admin-rights to one of these computers to test if disabling these drivers would help, but we must not change the configuration so that some software does not work after the tests. Therefore I cannot uninstall any software because I have not the mediums, licenses or knowhow to reinstall those apps. The support of this company however will only begin to work, if I can tell them what the real problem is. Thats why we search for a way to disable these mirror-drivers (or a hint to solve the dx problem if we are on a false trace)

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• PHP-FPM performing worse than mod_php

  - by lordstyx

  Recently the website I maintain has been growing a lot and I saw the point coming where I'd want to switch from apache to nginx, because I kept on reading that it performs way better. Now I've done the switch, and I have to say, nginx is keeping up just fine. However, php-fpm is forming a problem. Where the php pages used to take 0.1 second to generate with the same load they now take around 3 seconds! Furthermore the error.log from nginx is being spammed with errors like: upstream timed out (110: Connection timed out) while connecting to upstream, client: ... I also tried using unix sockets instead, but those would complain about the following: connect() to unix:/tmp/php5-fpm.sock failed (11: Resource temporarily unavailable) while connecting to upstream I've fiddled with settings here and there but nothing seems to work. Changing the amount of pm.max_children doesn't seem to help a lot either, but with it's current amount at 350 it seems to be the lesser of all evil. The server that's being used has 3 GB RAM (not all of it is free due to a MySQL server also running) along with 2 dual-core processors (4 cores in total). Am I doing something majorly wrong with the settings here, or is the server simply not capable enough? EDIT: Here is the nginx server block server { listen 80; listen [::]:80 default ipv6only=on; root /var/www; index index.php index.html index.htm; server_name localhost; location / { try_files $uri $uri/ /index.html; } location /doc/ { alias /usr/share/doc/; autoindex on; allow 127.0.0.1; deny all; } location = /50x.html { root /usr/share/nginx/www; } location ~ \.php$ { fastcgi_split_path_info ^(.+\.php)(/.+)$; # NOTE: You should have "cgi.fix_pathinfo = 0;" in php.ini try_files $uri = 404; # With php5-cgi alone: fastcgi_pass 127.0.0.1:9000; # With php5-fpm: #fastcgi_pass unix:/tmp/php5-fpm.sock; fastcgi_index index.php; include fastcgi_params; } location ~ /\.ht { deny all; } } And the php-fpm pool: [www] user = www-data group = www-data listen = 127.0.0.1:9000 ;listen = /tmp/php5-fpm.sock listen.backlog = -1 pm = dynamic pm.max_children = 350 pm.start_servers = 200 pm.min_spare_servers = 10 pm.max_spare_servers = 350 pm.max_requests = 1536 rlimit_files = 65536 rlimit_core = unlimited chdir = /

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• Complete machine freezes...at a loss

  - by user28818

  Guys, We built around 12 machines a few months ago to run Ubuntu. They each have the following specs: ASUS Z8NA-D6 motherboard Dual quad core Intel(R) Xeon(R) CPU E5520 @ 2.27GHz OCZ Mod Extreme Pro 500W power supply 12 GB Kingston RAM Nvidia GeForce 9800 GT graphics card My machine ran well for awhile. However, it started experiencing random lockups. These lockups are not X lockups, they are complete system freezes. The nic stops responding, the magic sysrq buttons won't work. The machine is dead. I first suspected RAM. Memtest86 didn't find anything, but I replaced the RAM anyway. Still, lockups. So I replaced the graphics card. Still, more lockups. They became more and more frequent and started to happen 2-3 times a day. So I replaced the motherboard and power supply in one fell swoop. Suddenly, no more lockups! Woohoo! Except, a week later, in the morning, the machine wouldn't wake up. I reset it, started it up, and the log files showed the last entry at around 11 pm the evening before. This has started occurring with more frequency...now just about every morning I come in, the machine is locked up, and has been since the night before. Yesterday, in the 3 weeks since I replaced the motherboard and power supply, the machine actually locked up on in in mid-work. This is the first time since replacing the two (MB and PS) that this happened while I was using it. All others occurred while I was away. I'm at a loss. Nothing is in syslog or message that would indicate a problem around the time of the lockup. Temps are good...I use lmsensors to monitor and have a script that writes the output to file every minute. They never get that high. The only thing I haven't replaced at this point is the case and the harddrives. I doubt either could be the cause. What would you do if you were in my shoes? Is there a troubleshooting approach I'm missing? For the record, all of the other machines, all eleven of them, don't have any problems. They're all running the same version of Ubuntu (Lucid) that I am. Thanks!

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• Squid on windows loadbalancing only to one server

  - by Martin L.

  After thousands of googles and trying days i cant get the load balancer/failover in squid on windows to work. Iam using squid 2.7. My webservers are 2 single NIC lighttpd and one dual nic lighttpd. server1 in this example is running squid on port 80 and lighttpd on port 8080 (just to test) Requirements: All 3 webservers running lighttpd should be balanced two option for load balancing: Best would be if server1 is busy server2 takes over, if server2 is busy server3 takes over, etc.. Round robin style evenly distributed load. Eg server1 takes first call, server2 second etc.. All requests should be treated the same way (no url rewriting or so on) Sent host headers have to be redirected to every server as http host header, speaking of "server1", "server1.company.internal" and "10.211.1.1". My approach: acl all src all acl manager proto cache_object http_port 80 accel defaultsite=server1.company.internal vhost #reverse proxy entries cache_peer 10.211.2.1 parent 8080 0 no-query originserver round-robin login=PASS name=server1_nic1 cache_peer 10.211.1.2 parent 80 0 no-query originserver round-robin login=PASS name=server2_nic1 cache_peer 10.211.2.3 parent 8080 0 no-query originserver round-robin login=PASS name=server3_nic1 cache_peer 10.211.2.4 parent 8080 0 no-query originserver round-robin login=PASS name=server3_nic2 #decl of names of squid host acl registered_name_hostdomain dstdomain server1.company.internal acl registered_name_host dstdomain server1 #ip of squid host acl registered_name_ip dstdomain 10.211.2.1 # access: redirects the correct squid hostname http_access allow registered_name_hostdomain http_access allow registered_name_host http_access allow registered_name_ip http_access deny all cache_peer_access server1_nic1 allow registered_name_hostdomain cache_peer_access server1_nic1 allow registered_name_host cache_peer_access server1_nic1 allow registered_name_ip cache_peer_access server2_nic1 allow registered_name_hostdomain cache_peer_access server2_nic1 allow registered_name_host cache_peer_access server2_nic1 allow registered_name_ip cache_peer_access server3_nic1 allow registered_name_hostdomain cache_peer_access server3_nic1 allow registered_name_host cache_peer_access server3_nic1 allow registered_name_ip cache_peer_access server3_nic2 allow registered_name_hostdomain cache_peer_access server3_nic2 allow registered_name_host cache_peer_access server3_nic2 allow registered_name_ip cache_peer_access server1_nic1 deny all cache_peer_access server2_nic1 deny all cache_peer_access server3_nic1 deny all cache_peer_access server3_nic2 deny all never_direct allow all Problems: Load balancer does not load balance other than to first server. Only if the first server is killed in any way the second will take over. I have seen the others working at some point, but definitely not as the intended load balancing described above. If the cache_peer_access is not defined sometimes the wrong hostname is sent to the backend webserver and this always depends on the defaultsite= parameter. Probably because the host header on the request to squid is not set and its replaced by defaultsite. Leaving out defaultsite didnt solve the problem. The only workaround i found for this is the current approach with cache_peer_access. Questions: Does the cache_peer_access influence the round-robin? Is there a better workaround to pass the host header to the backed webservers? Which parameters do increase the speed of load balancing or does anyone have a better approach? -Martin

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• What are the most likely bottlenecks determining the performance of CamStudio screen recording?

  - by Steve314

  When doing screen recording, I can get a frame rate of maybe 15 frames per second for the full screen on my 1080p monitor using the XVID codec. I can increase the speed a bit by recording a region, changing screen modes, and tweaking other settings, but I'm curious what hardware upgrades might give me the biggest bang for my buck. My PC is budget, but modern... Athlon 2 X4 645 (3.1GHz, quad core, limited cache) processor. 4GB single channel DDR3 1066 RAM. ASRock motherboard with NVidia GeForce 7025/nForce 630a Chipset. ATI Radeon HD 5450 graphics card - 512MB on board, not configured to steal system RAM. I dual-boot Windows XP and Windows 7. For the moment, XP is my bigger performance concern as it's still my getting-things-done O/S as opposed to my browser-host O/S. My goal is to make a few programming-related tutorials. For a lot of that I don't need screen recording - I can make up some slides, record audio with the PC switched off, yada yada. When I do need screen recording, I'll mostly be recording Notepad++, Visual Studio or a command prompt. Occasionally, I may be recording some kind of graphics or diagram program and using my pre-Bamboo cheap Wacom tablet - I have the CS2 versions of Photoshop and Illustrator, but I'd much more likely be using Microsoft Paint. Basically, what I'll be recording won't be making huge demands on the machine - but recording a fair number of pixels (720p preferred) will be useful. What's particularly wierd - not so long ago I still had a five-year-old Pentium 4 based PC. And (with the same 1080p monitor) it could record at not far from the same frame rate. So clearly the performance issues are more subtle than just throw-money-at-it. My first guess would be that the main bottleneck is the bandwidth for transferring data to/from the graphics card. Is that likely to be correct? In support of that, see this [Radeon HD 5450 review][1] - the memory bandwidth is only 12.8 GB/s. If you can't get data out of graphics memory quickly, you can't transfer it back to the system memory quickly. Apparently, that's slower than some top-end cards in 2002.

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• All internet requests in Windows time out

  - by Brandon

  So, I've run into a very strange problem with my home wireless network. Previously, at seemingly random times, the router seemed to disconnect all wireless hosts and cause all of the wired hosts to have a "limited connection" according to windows. In order to fix this, I had to unplug all of the wired hosts from the router, unplug the modem from the router, and power cycle the router. This seemed to solve the problem for a while until the exact same thing happened a day later and I had to go through the same process again. That's where I noticed something weird happening. There was one wireless host (a Windows Vista laptop) that seemed to be causing the router to disconnect the other hosts whenever it connected. When this happened, only that laptop was able to use the wireless from the router. When this happened, I disconnected it from the wireless (by disabling the wireless adapter) then reconnected it (by re-enabling it) and now it, like the other hosts, couldn't connect. I've never really seen anything this strange happen on our network before. So, I restored the router to factory settings and the problem seems to have vanished except one crucial problem. There's another host (a Windows 7 laptop) that was perfectly able to connect before all of the router issues and even in between the crashing and power-cycling events but now says its connected and says it's able to reach the Internet, but all requests time out. In any browser I've tried, the tab says connecting to [site]... for a solid minute and then tells me the request timed out. When I try to ping google.com in cmd it also says request timed out. In frustration, I booted into a dual-boot Ubuntu installation on the Windows 7 host and the connection works fine, to my surprise, as ubuntu is where I am now typing this rather long question. I haven't looked through the event log in windows but will post anything I find in an edit I haven't tried connecting (in Windows 7) to any other wireless network, since The fact that it works in Ubuntu suggests its Windows and not the router but I didn't change any wireless settings in windows before it being able to reach the Internet and not. Does anyone have any clue what could have happened. I opened to buying another router as this one is almost a year old :) but I would like to know whats going on here. Thanks in Advance! P.S. Sorry for how long my question is, I'm a little anxious (:

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• Some Memory Slots Not Working on MSI FM2-A85XA-G65 Motherboard

  - by Mike Ciaraldi

  Short version of question: Does anyone have an MSI FM2-A85XA-G65 motherboard, who can confirm that all four memory slots work? Long version: Several months ago I bought an MSI FM2-A85XA-G65 motherboard at Newegg. At that point I installed an AMD A8-5500 processor and two sticks of Corsair Vengeance 8 GB DDR3-1866 memory, and put it into my file server. I installed the RAM in slots 1 and 3, as directed in the manual, to enable dual-channel memory access. It seemed to work fine, so I bought a second identical mobo (which arrived dead, but was quickly replaced by Newegg) and set of RAM, installed an A10-5800K, and put that into my production Linux machine. Again, it seemed to work well. Eventually I happened to notice that on the server only 8 GB of RAM appeared in the BIOS. I tried each of the slots and memory modules individually and in various combinations. I even swapped processors with the production machine. The result was that putting memory in slots 1 and 2 worked (showing a total of 16 GB), but any memory in slots 3 or 4 was not recognized. However, all four memory slots in the production machine worked, and I confirmed this with both processors. I contacted MSI and arranged to ship the defective mobo back to them for replacement under warranty. I did not want my file server to be down in the interim, and I had another machine I wanted to upgrade, so I bought a third identical mobo to use. That one had the same problem -- only memory slots 1 and 2 worked. I tested it thoroughly with multiple processors and memory sticks. I sent the defective mobo back to MSI and they sent me a new one. This has the same memory slot problem. So I sent it back. The replacement arrived the other day and shows the same problem. I contacted MSI yet again and they said that nobody else has reported memory slot problems on this board and it must be my processor. So my score so far is, out of six boards of this model, I have: One where all four slots work. One which was dead on arrival. Four where only memory slots 1 and 2 work. Before I tear my other machines apart and start swapping processors again I thought I would ask if anyone else has this exact model motherboard and could confirm that all four memory slots either do or do not work. According to MSI you should be able to just plug a single memory module into any of the slots and it will work (and it does on the one mobo I have which works correctly). If you have not yet used all four slots, this is a good time to test them so you know if you can expand your memory in the future. Thanks in advance to anyone who can help.

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• Can I use one virtualbox disk for multiple machines?

  - by mxp

  I'm not sure what search term to use and skimming through the VirtualBox manual didn't help me either, so I ask my two questions here... My setup is this: PC with dual boot into Windows 7 and a Debian operating system (both 64bit). I've created a virtual machine (Kubuntu, 64bit) under Windows and put it's VDI file on a SMB share of my NAS. Then I created a VM under linux using the same settings for memory etc and assigned the existing VDI file to it. My idea was that I could use that virtual machine from Windows and Linux as well. (1) Is this generally something that should work without problems? I noticed that snapshots get me into trouble because they appear to be not visible from the other operating system: The snapshots I took after installing the guest system are not visible under Linux. That's why I shut down the VM after usage and not save its state while it's running. My current problem is this: I have used the VM under Windows first, then under Linux. Now it will only start on Linux. When trying this on Windows the guest OS detects some kind of hard disk error and fails to boot because it cannot mount its drive. Obviously the virtual hard disk won't fail so it must have something to do with me using it under Linux. (2) How can I fix that? Update: It also looks like any changes I made in the VM under Linux have been reset by trying to boot it under Windows. Looks like it's back to the latest snapshot. I'm confused... Update The answer to my first question can be found below. In short: It works, as long as you don't use snapshots. The answer to my second question is this: Under Windows set the VM back to the latest snapshot and then discard the snapshot so it gets merged. There should be no snapshots left at the end. If you have multiple snapshots, discard the earliest ones first (Snapshot 1, then 2, 3, ...). I'm not sure what happens if you start at the end (.., 3, 2, 1). This of course leads to some data loss since you revert all changes since the last snapshot. But at least the VM is usable again.

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• Should I choose KVM/XEN over OpenVZ or use them together?

  - by Krystian

  I've got a dual xeon e5504 server, with [for now] only 8GB of ram. Storage is'n impressive either: 3x 146GB sas in raid5 + 500GB sata drives. Currently it works as a development server, but it's over speced for our needs and since our development methods changed through last 2 years we decided it will work as a production system for some of our applications + we would like to have a separate system for testing/research. Our apps are mainly web apps deployed on tomcats [plural as some of the apps require older versions] and connected to Postgres. I would like to have a production system, where only httpd+tomcat+db are setup and nothing else runs there. Sterile system. Apart from that, I would like a test system, where I can play with different JVM settings, deploy my test apps, play with tomcat/httpd settings and restart them without interfering with the production system. Apart from that, I would like to be able to play with different linux flavors, with newer kernels to test how they work etc. I know, this is not possible with OpenVZ and I would have to choose KVM for that. I am thinking about merging the two, and setting up a KVM to be able to work with different systems [linux only to be frank] + use openVZ to setup separate machines for my development needs. I would simply go with that, but reading here and there about the performance impact full virtualization has over containers and looking at the specs of my server makes me think twice about it. I don't want to loose too much performance, especially because of the nature of my apps [few JVMs running at the same time]. It will be my first time with virtualization, apart from using desktop virtualbox/vmserver. Although I am a fast learner I don't want to mess with the main system so much that it will break the production apps or make them crawl. Although they are more or less internal apps and they don't produce much load, they need to be stable. I've read, that KVM host is a normal linux installation and it allows to run normal processes on it. If that is so, does it allow to run openVZ as well? I mean... can I have KVM and OpenVZ running on the same system/kernel? Or do I have to setup another system to run OpenVZ containers? How much performance impact can this have for me? Will my hardware suffice? oh and one more thing... unfortunately I'm quite limited with the funds... I'm looking for a free solution only :/

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• How to stretch the image from one screen to two screens

  - by wxiiir

  I want to be able to stretch the image from one monitor to a second monitor even if i have to use some software to do it. For example i want the top half of the image that is now shown on my first monitor to occupy the whole second monitor and i want the bottom half to occupy the whole first monitor, or the other way around i don't really care as long as it works. I would be cool to know how to do the same stuff but to the left half and right half. I know that image pixels would have twice the lenght or height this way but i don't really care about it as long as it works so basically i want the stuff to show on both monitors but with the same pixels as before. I have a hd4870 and windows7 and hd4000 family doesnt support having two monitors behaving like a large one, only hd5000 upwards, this would solve my problems without any of the drawbacks but it just can't be done (or maybe it can via software but i'm just too tired of searching). A solution to make almost any graphic card have two monitors behaving like a large one is matrox dualhead2go but that's just as expensive as a good hd5000 card so it's not worth it. thanks in advance EDIT I guess that nobody so far was able to fully comprehend my problem that was very explicitly written but i will elaborate some more. My hd4870 can have 2 monitors working with it but some stuff like games won't run on both monitors, which sucks. There are some ways to circumvent this problem and two of them are perfect or almost perfect but expensive and the third would be a software solution that would make it possible. The first one is to have and hd5000 family video card which will work just fine with both monitors. The second is to have a matrox dualhead2go that will make my hd4870 detect my two monitors as a large monitor. The third is to have a software that makes my two displays be detected as a large display and then captures the output of the video card, splits the images and renders them as 2d images to both monitors OR a simpler one but that would make outputted pixels double the width or height would be to capture the output of the graphics card to one screen, split it in two and enlarge it to fit both monitors and then output it to the monitors. p.s. By capturing the output of the video card i mean just make the video card process the stuff in a certain way. Making the video card detect two monitors as a large one via software may be a bit impossible or impracticable but stretching the output as a 2d image from one to both monitors for some coders should be a walk in the park so it would be likely that such program would exist or that some widespread softwares for dual monitor would have such function in them.

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• Computer randomly reboots during "intensive activity".

  - by Reznor

  My friend has been playing games on his new build for some time now. However, lately, his computer will randomly reboot out of nowhere, so far only happening in game, and presumably only to happen in game as it happens nowhere else. This can happen in game during play or even in the options. Note, it isn't a crash or blue screen. It's just a normal reboot. This started today, I believe, and has only occured in two games: Dead Space and Stalker: Shadow of Chernobyl. He has played a handful of games before these, for about a week or so, without this problem. We theorized on two possibilities: Maybe something is overheating? Maybe the power supply is inadequate? These two were quickly dismissed, as all his components were operating at normal temperatures when he got back to his desktop from the reboot, and we all know these parts don't exactly cool down quickly, especially if they get hot enough to trigger a reboot. Besides, I know at-least my motherboard reports processor overheating at start-up, and requests I press f1 to continue into boot. The PSU one was dismissed too. He has an 850w power supply on a rig that was estimated to take only 720 some watts, that's with some overcompensating to be safe. He opened up his case to make sure nothing was seated wrong or in the way. All was fine, but he did notice a sticker on his video card. It had a giant barcode on it and some numbers. Now, I'm used to seeing these stickers, they're the warranty stickers, right, and removal voids the warranty? Yeah, well, we find it odd because this sticker is slapped right over the circuits of the video card, not on a block or anything. Is this normal? Should he remove it? Right now, I am concerned with the memory. Could that be at fault? Here are his specs: Windows 7 Home Premium, 64-Bit Intel i7 950 EVGA GeForce 570 GTX 4 GB DDR3 PC10666 dual-channel Corsair RAM Corsair 850w PSU Gigabyte GA-X58A-UD3R Western Digital 1 TB WD1001FALS

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• Wireless Network suddenly cant connect after Windows update

  - by vinir

  UPDATE: As my patience started to end, the laptop started to display symptoms of other malfunctions, so I ended up returning it to Asus and actually had the price of the laptop back in store credit. I did not solve the problem per se, but as I don't have the notebook and the screen, the keyboard, the touchpad and other parts were malfunctioning, I can safely assume that it was put to rest. I don't know how to behave when my question isn't actually answered, but was "solved", so I placed this over here. Anyone that knows how to end this topic, I would appreciate the heads up. Thanks for everything, everyone, it's nice to see that this topic in the community was active even when all this time had passed. vinir So I bought an ASUS K43E notebook earlier this year and built a wireless conection to link it to. It worked great for the first weeks, but then I updated my Windows 7 Home Basic with the daily updates; After that my home network couldn't be reached no matter what I did. I have linux on dual boot on the same notebook and it can connect to my home wireless network flawlessly. I have a hunch that it's somehow related to the Network Profile settings. I have noticed my network was set as "Home network", but after the system updates I got changed to "Public". Now I can't connect to it to change the profile settings. My Atheros Network adapter is updated to the latest driver (march 2012), and I still can't connect. The funny thing is that the same thing happened to my mother's notebook, as it has the same Network Adapter, Atheros AR9285, as I recall it. I managed to fix it on my mother's computer by using an specific network LSP and profiling reset that was available through her notebook's antivirus program, avast! Internet Security. I can't get that to work on my notebook, but I suspect that some related tool might just make it work too. So the question is: how to modify a network's profile and settings that were stored in my notebook? I can't connect to the specific network on Windows, as stated before.

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