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• DNS Resolution doesn't work after uninstalling Cisco VPN & Deterministic Network Enhancer in Win 7

  - by Craig M

  I just upgraded my home PC to Windows 7 Ultimate 32 bit. After trying various methods to get the Cisco VPN client to work, I gave up and decided to just run it in XP mode. The last steps I tried were in this article ( http://social.technet.microsoft.com/Forums/en-US/w7itproappcompat/thread/d880dfe5-7f44-4955-8620-2a9355d8ea8b/ ) After that, I uninstalled the Cisco client and rebooted. I uninstalled the Deterministic Network Enhancer and rebooted again. Both uninstalled successfully, but now I'm not able to resolve any DNS. The only way I can resolve DNS is to reinstall the DNE, reboot, and uninstall the DNE. Then I am able to resolve DNS lookups until I reboot again. Once it's rebooted, no more DNS. Any ideas? Edit: I completely forgot I'd asked this question until harrymc posted his answer. I've since found out that to fix this problem, I need to disable my Local Area Connection and re-enable it. Once I do that I have no trouble making network connections until the next time I reboot at which point I repeat the process. It's annoying, but manageable since I reboot very infrequently.

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• Huge or minimal performance hit running game servers on a Virtual Machine? [closed]

  - by Damainman

  I have a two dedicated servers to choose from depending on which one would do a better job. I plan on updating the Hard Drive space and RAM at a later date depending on how I move forward. Server 1: 500GB Hard Drive 8GB RAM 2x 64bit Intel Xeon L5420(Quad Core) @ 2.50Ghz Server2: 500GB Hard Drive 8GB RAM 2x 64bit Intel Xeon E5420(Quad Core) @ 2.50GHz I want to run a virtual machine that will host about 10 game servers, with about 16 active slots per server. It will be a mix and match from: Minecraft Counter Strike( 1.6, Source, Global Offensive) Battlefield Team Fortress I know the general consensus is virtualization is a horrible idea if you plan on running virtual servers on them. The issue is, the discussions I read do not really clearly state whether they are speaking about a virtual server running inside an OS(ie: VMware Player running on Windows with the game server in a VM) or a Hypervisor such as Xen Cloud Platform. I am trying to get a definite answer on how feasible the above would be and how much of a performance hit it might be if the VM running the game servers is on a hypervisor such as Xen Cloud Platform. My initial research lead me to believe that there wouldn't be a performance hit since the virtualization is different than running it via inside of a OS.

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• What keeps you from changing your public IP address and wreak havok?

  - by Whitemage

  An interesting question was asked to me and I did not know what to answer.. So I'll ask here. Let's say I subscribed to an ISP and I'm using cable internet access. ISP gives me a public IP address of 60.61.62.63. What keeps me from changing this IP address to, let's say, 60.61.62.75 and mess with another consumer's internet access? For the sake of this argument, let's say that this other IP address is also owned by the same ISP. Also, let's assume that it's possible for me to go into the cable modem settings and manually change the IP address. Under a business contract where you are allocated static addresses, you are also assigned a default gaetway, a network address and a broadcast address. So that's 3 addresses the ISP "loses" to you. That seems very wastefull for dynamically assigned IP addresses where the majority of customers are.. Could they simply be using static arps? ACLs? Other simple mechanisms? Anyone who worked at an ISP would be willing to explain this a bit?

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• Migrating mysql 4 to mysql 5

  - by Lennart Regebro

  This seems to me to be a common use case, so I'm surprised so little information is about it, so sorry if it's a duplicate, but I have searched. :) I'm migrating a clients website from one CMS to another, and of moving to newer faster machines all at the same time. As a part of this I'm moving a MySQL database from the old server to the new ones. The problem is that the old server runs MySQL 4 and the new MySQL 5. So when i do a mysqldump at the old site and then try to run it on the new site I get syntax errors. ERROR 1064 (42000) at line 178: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'BTREE (`id`), KEY `f_ChangedOnWeb` (`f_ChangedOnWeb`), KEY `f_AddressUpdate`' at line 56 I also tried to use an even older syntax by dumping with --compatible mysql323, but that just resulted in ERROR 1062 (23000) at line 2283: Duplicate entry '??????????' for key 2`... It seems to me this must be a reasonably common use case, yet I can't find any sort of help on this. Possibly all my Google searches just drown in irrelevant answers. Most seem to agree that mysqldump is the right answer, but noone mentions that you can get syntax errors...

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• Mysql can not resolve hostnames when checking privileges

  - by Fabio

  I'm going crazy to solve this. I have a mysql installation (on machine db.example.org) which doesn't resolve a given hostname. I gave privileges using hostnames i.e. GRANT USAGE ON *.* TO 'user'@'host1.example.org' IDENTIFIED BY PASSWORD 'secret' GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, INDEX ON `my_database`.* TO 'user'@'host1.example.org' However when I try to connect using mysql -u user -p -h db.example.org I obtain ERROR 1045 (28000): Access denied for user 'user'@'192.168.11.244' (using password: YES) I already checked for correct name resolution in the dns system: $ dig -x 192.168.11.244 ;; ANSWER SECTION: 244.11.168.192.in-addr.arpa. 68900 IN PTR host1.example.org. I've also checked for skip-name-resolve option in mysql variables in fact if I can access from another machine on the same subnet using hostname privileges. The only difference is that host1.example.org and db.example.org point the same ip on the same machine i.e. both db.example.org and host1.example.org have ip 192.168.11.244. In this way all the applications using that database can use the name db.example.org and we can move the data on other hosts (if needed) just by changing the dns record, leaving the application code unchanged. What should I do to solve this or at least to understand what's happening?

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• Zabbix Proxy not collecting data

  - by syntaxcollector

  Hi All I have a working Zabbix 1.8.2 server collecting data for our office and our colo facility. However the link between the colo and office is flaky. What I'm trying to do is setup a proxy on the colo side to have a 1 hour cache and relay the data to our primary server at the office. Our zabbix server is compiled from source and uses a mysql database I've followed the instructions found in the zabbix documentation to compile the proxy using a sqlite3 database. I add the proxy to zabbix under Administration-DM-Proxies. The zabbix server "sees" the proxy because the "last seen" field is always under 60s. However when I assign a colo host to the proxy I stop receiving data from it. The colo host's zabbix_agentd.log file says this: 29343:20100622:124847 Timeout while answering request 29343:20100622:124847 Getting list of active checks failed. Will retry after 60 seconds The zabbix_proxy.log says this. 2041:20100622:123131.760 Deleted 0 records from history [0.000994 seconds] 2028:20100622:124131.671 Error while receiving answer from server [ZBX_TCP_READ() failed I also am unable to receive any SNMP data which is more important to me than the zabbix agent data. Has anyone had this problem before? Zabbix Server OS: CentOS5.4 Zabbix Server Build: 1.8.2 from source Zabbix Proxy OS: CentOS5.4 Zabbix Proxy Build: 1.8.2 from source P.S. The SQLite database on the zabbix proxy never gets any data written to it, it is identical to when I created it from the blank schema in zabbix-1.8.2/create/schema. (Yes I've checked the permissions)

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• Import exponetial fixed width format data into Excel

  - by Tom Daniel

  I've received a bunch of text data files consiting of Lots of records (30K/file) of 3 fields each of 5-place numbers in exponential format: s0.nnnnnEsee (where s is +/-, n is a digit and ee is the exponent (always 2 digit). When I open the file in Notepad, the format is perfectly uniform throughout each file, but when I import it to Excel using Data|Import|Fixed Width, many of the data values get messed up, no matter what format (text, exponential, various custom tries) I assign to the cells. Looking at the Notepad version, it appears that leading + signs were replaced with a space in the data file, but the sign of the exponential is always there. This means that some fields begin with a space, and this appears to confuse the Excel import routine. I get the same result in Excel 2003 and 2007. I'm sure there's a straightforward solution (hopefully without a messy VBA routine), but I can't figure out what to try next. :-) To clarify (hopefully), here are some input records and the corresponding text input to Excel: Notepad Excel -0.11311E+01 0.10431E-04 0.27018E-03 -0.11311E 1.0431E-05 2.7018E-04 0.19608E+00-0.81414E-02-0.89553E-02 0.19608E -8.1414E-03 8.9553E-03 etc. Whoopee! Solved my own problem - in the spirit of Jeopardy, now that I've begun the question, here's the answer - Use a different "File Origin" - several other than the default "Unicode UTF..." work fine! What a pain. Hope this helps somebody else avoid a few unpleasant hours! Aloha from Kona, Tom

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• how to remove an entry from system tray?

  - by altvali

  I've searched for an answer to this one and I haven't found one yet. How do i remove a single item from Windows' System tray? I'm targeting Windows XP. Edit: This is not about preventing items from starting up. I want the program to keep running, I just need another script/program to remove the first one's entry from system tray. Second Edit: One approach that I can think of is to try to hide the intended app by modifying registry keys. On several test machines I've found some registry entries that match the System tray information at HKEY_USERS\something-that-looks-like S-1-5-21-682003330-1563985344-725345543-1003\Software\Microsoft\Windows\CurrentVersion\Explorer\TrayNotify with BalloonTip, IconStream and PastIconsStream containing systray information. The important one is IconStream. On other machines, these are found at hkey_classes_root/local/setting/software/microsoft/windows/currentversion/TrayNotify I'm quite sure there's no danger in changing those specific registries, but I don't know how to write code for that. Can anyone help me with the code and with confirming if this has the desired effect of hiding the systray icon for an active program?

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• SQL transaction log backups conflicting with full backups?

  - by BradC

  On our SQL servers (2000, 2005, and 2008), we run full backups once a day in the evening, and transaction log backups every 2 hrs. We haven't really worried about these two processes conflicting, but lately we've run into some of the following issues: On one server, the trans log backup occasionally blocks the full backup, and must be manually stopped before the full backup can complete We sometimes end up with a massively-sized trans log backup file (sometimes larger than the full backup!) that seems to occur at the same time the full backup is running. I found a reference that indicate that these are "not allowed" to run at the same time, whatever that means: SQL 2000 Books Online and SQL 2005 Books Online. I'm not sure whether that means that the server will simply prevent them from running simultaneously, or if we ought to be explicitly stopping the log backups while the full backups are running. So are there known conflicts/issues between these? Does the answer differ between SQL versions? Should I have the trans log backup job check to see if the full backup is running before it executes? (and how do I do that...?)

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• PDF to HTML - batch converter - most reliable and accurate free AND paid for software?

  - by therobyouknow

  I'm look for either a free or paid-for (about 50$/40pounds) BATCH PDF to HTML converter to convert several PDF files at once. Needs to be able to handle vectored and bitmap images within the file, outputting both as jpegs referenced by the html pages. I've tried iorigsoft paid-for PDF to HTML - problems it seems to hang or just go idle, and the stuff it actually converts have broken links - the wrong name is used for constituent chapters as html. Also tried application from intrapdf.com but this crashes near the beginning of the conversion, consitently. Update: intrapdf works on my Windows XP machine but not on my Windows 7 machine. The only glitch is with the framed index contents html - the graphics in the page do not display in the page in the frame - but if you open the frame only in a new tab then you can see them. That might be a browser glitch in chrome only. This solution is good enough for me - given that I've already spent the money (I had spent before I asked) but I can't accept my own answer as this does not work on Windows 7. Looked at opensource tools but they look equally flakey or use old PDF versions. Need it on Windows 7 32bit home. Thoughts?

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• VPN with client-to-client direct connectivity?

  - by Johannes Ernst

  When setting up a VPN, clients (say client1 and client2) usually authenticate to a server, and together the three constitute the VPN. When client1 wishes to send a packet to client2, this packet usually gets routed by way of server. Are there products / configuration blueprints for products where it is possible to send packets directly from client1 to client2 without going though server? (if the underlying network topology permits it, e.g. no firewalls in the way) If not, is there a way by which client1 can send a packet to client2 by way of server, without the server being able to snoop on the content of the packet? (E.g. because the packet is encrypted with the public key of client2) I just asked in the OpenVPN forum, and the answer I got was "not with OpenVPN". So my question is: are there other products with which this is possible? Open-source preferred ... One use case: client1 and client2, typically in separate offices, find themselves both at headquarters. Do they still need to talk to each other via the public internet? Links appreciated. Thank you.

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• Computer won't boot from a bootable DVD

  - by JohnB

  My friend gave me his old computer that used to have WinXP on it. I'm trying to load Win7 on it and I thought there was something wrong because it wouldn't boot off a bootable disc, even though I setup the BIOS boot settings properly (I've done this sort of thing a million times). However, this closely related post helped me realize that I can boot off a bootable CD (WinXP), just not a DVD (Win7) Computer won’t boot from CD/DVD drive That might be the answer to my question, however, this motherboard is still pretty current technology. It's a good quality Gigabyte board, and judging from this product page, it came out in 2004. If I can't figure out a solution to my DVD boot problem, I'll have to try something like this: Boot and Install Windows from a USB thumb drive I guess it's possible that this motherboard doesn't allow booting from a DVD, but I still think that I might be missing something. It wouldn't be the DVD rom drive would it? I did try another drive and had the same results. However, I didn't try booting a DVD in the computer that the other test drive came out of, I'll do that later today. Any other advice? Thanks.

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• Are SATA II and SATA 3.0 Gbps compatible?

  - by Johnny Maelstrom

  I am trying to check that if I buy a new internal HDD it will work in the NAS I am buying. Currently I'm confused about naming schemes and once that is resolved whether there is compatibility. I will gladly author this question to be more general if there is not already an article helping with the confusion of SATA naming and standards. I see similar, but not identical questions and will accept this as a duplicate if thought as such. The specifications on the eCommerce site for the NAS says, "Controller Interface Type Serial ATA-150", the product home page for the manufacturer says, "Compatible with SATA and SATA II HDD". The specifications on the eCommerce site for the hard drives say, "Interface Type Serial ATA-300", the product home page for the manufacturer says, "Interface SATA 3.0 Gbps" Wikipedia says many things about different naming conventions, the closest being, "SATA II 3.0 Gbit/s, which was colloquially referred to as "SATA 3G" [bps] or "SATA 300" [MB/s] since 1.5 Gbit/s SATA I and 1.5 Gbit/s SATA II were referred to as both "SATA 1.5G" [b/s] or "SATA 150" [MB/s]). Therefore, they will operate with negligible differences between them." Are SATA II and SATA 3.0 Gbps the same? I feel I'm tantalisingly close to getting a definitive answer here before I purchase, but really want to clear up these naming schemes.

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• Find out which task is generating a lot of context switches on linux

  - by Gaks

  According to vmstat, my Linux server (2xCore2 Duo 2.5 GHz) is constantly doing around 20k context switches per second. # vmstat 3 procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 2 0 7292 249472 82340 2291972 0 0 0 0 0 0 7 13 79 0 0 0 7292 251808 82344 2291968 0 0 0 184 24 20090 1 1 99 0 0 0 7292 251876 82344 2291968 0 0 0 83 17 20157 1 0 99 0 0 0 7292 251876 82344 2291968 0 0 0 73 12 20116 1 0 99 0 ... but uptime shows small load: load average: 0.01, 0.02, 0.01 and top doesn't show any process with high %CPU usage. How do I find out what exactly is generating those context switches? Which process/thread? I tried to analyze pidstat output: # pidstat -w 10 1 12:39:13 PID cswch/s nvcswch/s Command 12:39:23 1 0.20 0.00 init 12:39:23 4 0.20 0.00 ksoftirqd/0 12:39:23 7 1.60 0.00 events/0 12:39:23 8 1.50 0.00 events/1 12:39:23 89 0.50 0.00 kblockd/0 12:39:23 90 0.30 0.00 kblockd/1 12:39:23 995 0.40 0.00 kirqd 12:39:23 997 0.60 0.00 kjournald 12:39:23 1146 0.20 0.00 svscan 12:39:23 2162 5.00 0.00 kjournald 12:39:23 2526 0.20 2.00 postgres 12:39:23 2530 1.00 0.30 postgres 12:39:23 2534 5.00 3.20 postgres 12:39:23 2536 1.40 1.70 postgres 12:39:23 12061 10.59 0.90 postgres 12:39:23 14442 1.50 2.20 postgres 12:39:23 15416 0.20 0.00 monitor 12:39:23 17289 0.10 0.00 syslogd 12:39:23 21776 0.40 0.30 postgres 12:39:23 23638 0.10 0.00 screen 12:39:23 25153 1.00 0.00 sshd 12:39:23 25185 86.61 0.00 daemon1 12:39:23 25190 12.19 35.86 postgres 12:39:23 25295 2.00 0.00 screen 12:39:23 25743 9.99 0.00 daemon2 12:39:23 25747 1.10 3.00 postgres 12:39:23 26968 5.09 0.80 postgres 12:39:23 26969 5.00 0.00 postgres 12:39:23 26970 1.10 0.20 postgres 12:39:23 26971 17.98 1.80 postgres 12:39:23 27607 0.90 0.40 postgres 12:39:23 29338 4.30 0.00 screen 12:39:23 31247 4.10 23.58 postgres 12:39:23 31249 82.92 34.77 postgres 12:39:23 31484 0.20 0.00 pdflush 12:39:23 32097 0.10 0.00 pidstat Looks like some postgresql tasks are doing 10 context swiches per second, but it doesn't all sum up to 20k anyway. Any idea how to dig a little deeper for an answer?

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• Resize a RAID 1 volume on OSX Snow Leopard - how? (Note: software raid)

  - by Emmel

  I've scoured the Internet in search of an answer to this question, and as usual with OSX-related topics, I often don't find any deep-dive technical explanations sufficient enough to feel confident doing dangerous things. Here is my question: I have a Mac Pro, running OSX 10.6.2. I have, as my main root/boot disk, a RAID 1 volume called "Mirror1". Mirror1 is comprised of two 1 TB disks. Mirror1, however, is fixed at 640 GB. That's because, I originally took a 640GB disk, bought a terabyte disk, mirrored it (using diskutil appleraid enable...), when it synced I removed the 640GB and replaced it with a second 1 TB disk, and synced again. Voila! A single 640 GB replaced by two 1 TB disks in a mirror.. Actually, no. There's still something missing from the equation: Mirror1 needs to be expanded from 640GB to 1 TB to match the partition sizes on each of those disks. How do I do this? Perhaps the diskutil output will help: -> diskutil list /dev/disk0 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk0 1: EFI 209.7 MB disk0s1 2: Apple_RAID 999.9 GB disk0s2 3: Apple_Boot Boot OSX 134.2 MB disk0s3 /dev/disk1 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *1.0 TB disk1 1: EFI 209.7 MB disk1s1 2: Apple_RAID 999.9 GB disk1s2 3: Apple_Boot Boot OSX 134.2 MB disk1s3 /dev/disk2 #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme *640.1 GB disk2 1: EFI 209.7 MB disk2s1 2: Apple_HFS Mac Disk 2 536.7 GB disk2s2 3: Microsoft Basic Data BOOTCAMP 103.1 GB disk2s3 /dev/disk3 #: TYPE NAME SIZE IDENTIFIER 0: Apple_HFS Mirror1 *639.8 GB disk3 -> diskutil appleraid list AppleRAID sets (1 found) =============================================================================== Name: Macintosh HD Unique ID: 1953F864-B474-4EB6-8E69-41834EBD0247 Type: Mirror Status: Online Size: 639.8 GB (639791038464 Bytes) Rebuild: manual Device Node: disk3 ------------------------------------------------------------------------------- # Device Node UUID Status ------------------------------------------------------------------------------- 0 disk1s2 25109BAE-5697-40EA-B612-0217851444F7 Online 1 disk0s2 11B83AB0-8148-4DB6-8761-DEF08C855F8D Online =============================================================================== Thanks in advance.

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• How can I enable PHP5 for a site? Having problems with every single method.

  - by John Stephens

  I'm working on a client site that is hosted on someone's DIY Debian Linux server [Apache/1.3.33 (Debian GNU/Linux)], and I'm trying to install a script that requires PHP5. By default, the server parses .php files with PHP 4.3.10-22, which is configured at /etc/php4/apache/php.ini, according to phpinfo(). On the server I can see a config directory for PHP5 adjacent to the PHP4 directory: /etc/php5.0/apache2/php.ini. I have tried multiple methods to enable PHP5 for the document root where the site's files are hosted, including all available methods mentioned here. By far, the most common suggestion I've found is to add one or both of the following lines to the site's .htaccess file: AddHandler application/x-httpd-php5 .php AddType application/x-httpd-php5 .php Trouble is, when either or both of those lines are present, the site forces my browser to download any .php files requested, without parsing the PHP at all. All of the other methods mentioned in the above article cause a 500 Internal Server Error. There is no hosting control panel I can access in a browser to enable PHP5 for the site, but I do have shell access. When I asked the server administrator about this issue, he encouraged me to search for the answer on Google. Where could I begin to troubleshoot this issue? Are there ways to test or verify the server's specific PHP5 installation and configuration, using the command line or some other method? Do you have other suggestions to enable PHP5?

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• Thunderbird alerts when expected email does not arrive

  - by user871199

  I am on Ubuntu 12.04 using Thunderbird as email client. Both are up to date in terms of updates. I have bunch of nightly jobs that do the work and send a status mail. It gets tedious if you keep getting same/similar mails every day so I ended up writing a mail filter rule which causes emails to end up in their respective folders automatically. If things are going ok, I really don't need to read emails. Failure emails are sent to different alias - if the job runs. We recently discovered that one of the job had not run for few days as someone accidentally disabled it. In order to avoid such problems in future, I would like to setup thunderbird in such a way that if I don't get email from given address within given duration, it should alert me. My dream solution is to set up frequency - some jobs do run every 4 hours. Is this possible? Can I setup Thunderbird (preferred) or other email client for reminding me when expected email does not show up. Based on comments and answer I received, here are the reasons why I would like to use Thunderbird. We are already using Thunderbird. It has calender support via plugin, so I suppose someone is already watching time to remind us about the event. May be this another type of event. Additional job is one more failure point, may complicate life if it has to monitor multiple hosts. Additional tools - same thing, one more failure point. Thunderbird can be run across all the platforms we are using - Windows and Ubuntu. It sort of becomes platform independent solution.

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• sudo make install: permission denied

  - by Wojtek Rzepala

  I have a most annoying question about building from sources. I've searched for an answer for a long while and nowhere can I find one... I've compiled software from sources before and this just baffled me. So I am trying to install python 2.7.2 from sources. I can do a successful ./configure, also make seems to run fine. But when I do sudo make install, I get a variety of errors... First, sudo make install gives me this: make: stat: GNUmakefile: Permission denied make: stat: makefile: Permission denied make: stat: Makefile: Permission denied make: stat: install: Permission denied make: *** No rule to make target `install'. Stop. So I did chmod +rx Makefile*. To no avail. Then, sudo ls . says ls: cannot access .: Permission denied Then ls -d . says the permissions are drwxr-x--- Then, as a desperate measure, chmod +rx .. That gave me: make: stat: Modules/config.c.in: Permission denied make: *** No rule to make target `Modules/config.c.in', needed by `Makefile'. Stop. So some progress... What is happening here? It looks like some sort of permission problem. I presumed that sudo would be the solution but clearly there is something else going on here... I tried sudo -s but I get those permission problems all over again... I am using Ubuntu 10.04LTS.

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• DNS server not working?

  - by Behrooz A

  I just set up a DNS Server on my windows 7, called SimpleDNS I added a zone for example sag.com and defined www.sag.com and sag.com to 192.168.1.2 (my Network IP Address) . the problem is when I try to ping sag.com the SimpleDNS logs says that it answered the request with 192.168.1.2 , but the ping doesn't resolve anything . SimpleDNS logs: > 14:00:43 Request from 192.168.1.2 for A-record for www.sag.com > 14:00:43 Sending reply to 192.168.1.2 about A-record for > www.sag.com: 14:00:43 -> Answer: A-record for www.sag.com = > 192.168.1.2 14:00:43 -> Authority: NS-record for www.sag.com = mehr-pc nslookup : > C:\Users\Mehr\Desktop>nslookup www.sag.com DNS request timed out. > timeout was 2 seconds. Server: UnKnown Address: 192.168.1.1 > > DNS request timed out. > timeout was 2 seconds. DNS request timed out. > timeout was 2 seconds. DNS request timed out. > timeout was 2 seconds. DNS request timed out. > timeout was 2 seconds. > *** Request to UnKnown timed-out the DNS server IP is 192.168.1.2 , and Access point address : 192.168.1.1 what should I do?

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• How expensive to run PC 24/7 or how to figure out how to determine it?

  - by jasondavis

  I realize this question is difficult to answer as it would be different based on users location, what there PC is doing and what hardware it consist of, along with other factors but I am hoping someone could give me a very rough estimate. I have always ran many PC's in my home 24/7 and I am just now looking at it from a money/cost of electric point of view. 1) I live in Central Florida. Can anyone guesstomate/estimate the avaerage monthly or daily cost of running your average PC? Intel quad core processor, 1 SSD drive for OS and programs and 4-5 1-2 TB hard drives in a RAID setup for data. 750watt PSU. What would your guess be? 2) Also is there an accurate way to figure this out (non-super technical and confusing to a non-math person please) Also I have seen those kill-a-watt devices, do they figure this kind of stuff out for you? 3) Does a larger PSU make your PC consume more power? Thanks for any help, you can most likely tell I am somewhat lost about this!

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• scp No such file or directory

  - by Joe

  I've a confusing question for which superuser doesn't seem to have a good answer, and neither google. I'm trying to scp a file from a remote server to my local machine. The command is this scp user@server:/path/to/source/file.gz /path/to/destination The error I get is: scp: /path/to/source/file.gz: No such file or directory user is my username on the server. The command syntax appears fine to me. ssh works fine and I can cd to the file and it doesn't seem to be an access control issue? Thanks; Edit: Thank you John. I spotted the issue. ls returned this: -r--r--r-- 1 nobody users 168967171 Mar 10 2009 /path/to/source/file.gz So, the file was on a read-only file system and user is able to read it but not scp. I just copied the file to a different directory and chown it and worked fine. It would be good if someone can explain why this is the case though.

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• java max heap size, how much is too much

  - by brad

  I'm having issues with a JRuby (rails) app running in tomcat. Occasionally page requests can take up to a minute to return (even though the rails logs processed the request in seconds so it's obviously a tomcat issue). I'm wondering what settings are optimal for the java heap size. I know there's no definitive answer, but I thought maybe someone could comment on my setup. I'm on a small EC2 instance which has 1.7g ram. I have the following JAVA_OPTS: -Xmx1536m -Xms256m -XX:MaxPermSize=256m -XX:+CMSClassUnloadingEnabled My first thought is that Xmx is too high. If I only have 1.7gb and I allocated 1.5gb to java, i feel like I'll get a lot of paging. Typically my java process shows (in top) 1.1g res memory and 2g virtual. I also read somewhere that setting the Xms and Xmx to the same size will help as it eliminates time spend on memory allocation. I'm not a java person but I've been tasked with figuring out this problem and I'm trying to find out where to start. Any tips are greatly appreciated!! update I've started analyzing the garbage collection dumps using -XX:+PrintGCDetails When i notice these occasional long load times, the gc logs go nuts. the last one I did (which took 25s to complete) I had gc log lines such as: 1720.267: [GC 1720.267: [DefNew: 27712K->16K(31104K), 0.0068020 secs] 281792K->254096K(444112K), 0.0069440 secs] 1720.294: [GC 1720.294: [DefNew: 27728K->0K(31104K), 0.0343340 secs] 281808K->254080K(444112K), 0.0344910 secs] about 300 of them on a single request!!! Now, I don't totally understand why it's always GC'ng from ~28m down to 0 over and over.

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• Symantec Endpoint Protection Virus Definitions

  - by Gus Denton

  I have done some Googling but I cannot get a definitive answer certainly not from the Symantec KB. I have a Virtualised Win 2003R2 server 32bit. It has been provisioned to me with Symantec Endpoint Protection 11.0.62xxx CLIENT (not a definitions server) the directory C:\Program Files\Common Files\Symantec Shared\VirusDefs is 750MB IT doesn't contain .tmp directories so it is NOT a corrupt definitions server. IT does contain directories named with a date pattern YYYYMMDD.xxx Some of these folders are 12 months old and I would like to recover the space. The sysmantect forums are full of this stuff but a lot of the postings contain links back to documents that are not specific to End Point Protection Client. It appears that I should be able to delete the older folders and all will be OK. with a service restart however there is a warning about having Live Update Administrator Installed Firstly I have no idea if I have this installed how to I check and secondly can I just ditch these old files and restart ? Regards Gus Denton Learning and Teaching Uni of New South Wales Sydney Australia For those trying to assist me I thankyou. I have followed some instructions found on the Symantec site and assumed that the response from Nixphoe would resolve my issue. It appears that as I am on a provisioned VM from a central IT unit I cannot run the Symantec commands from the Run prompt as my admin creds to get me in. (smc -stop) Basically I need to claw back some Diskspace from the c: drive which is being filed up with WSUS patches and Symantec files. I have managed to delete one symantec cache through the live update control panel and recovered 470Mb I suppose my last question for those more experienced than myself is, can I simply remove say the two oldest virus definition folders without completely foobaring the End Point protection and the server ? Regards Gus

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• Understanding mail failure notices, 554

  - by goran

  I'd like to confirm the meaining of a mail failure notice. Here's the message Hi. This is the qmail-send program at mydomain.com I'm afraid I wasn't able to deliver your message to the following addresses. This is a permanent error; I've given up. Sorry it didn't work out. <[email protected]>: 1.2.3.4 does not like recipient. Remote host said: 554 <[email protected]>: Relay access denied Giving up on 1.2.3.4 The way I understand this is, that 1.2.3.4 is not setup to receive mail for this domain. dig domain.com MX shows ;; ANSWER SECTION: domain.com. 6245 IN MX 10 mail.domain.com. domain.com. 6245 IN MX 20 mx.anotherdomain.com. (1.2.3.4 is mx.anotherdomain.com.). The puzzling part is that I have reports that messages sent from gmail get delivered to this address. P.S. Is this a proper question for serverfault?

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• Curios: What makes CPUs better than others? [closed]

  - by Zizma

  I have been wondering about this for a long while now and was hoping someone here could answer it pretty easily. If I was looking for the most powerful CPU what should I really be looking at? There are so many different parameters of a CPU and I am wanting to know what each thing does and what really matters. Basically this: What is the deal with cores? If I take using optimized applications out of the mix would it theoretically better to get quad core 1.0GHz CPU or a 1 core 4 GHz CPU? Also, what is the difference between maybe an Sandy Bridge CPU versus an Ivy Bridge CPU? If they both were had the same clock speed and number of cores would the Ivy Bridge perform better? Does an older Xeon with an equal clock speed and number of cores to a new i7 really perform worse/slower? Does size matter? Why would I go with a 22nm CPU over a 32nm when the size difference is so trivial? What about the cache? When does the cache come into play with performance?

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