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• I2C_SLAVE ioctl in i2c linux driver

  - by zac

  I am supposed to write a simple write and read program for i2c but the problem is that i dont have the device at hand presently to test it so i need my code to be perfect. I am confused about the function of the I2C_SLAVE ioctl.From what i read,this ioctl is used to set the slave address. But we pass the slave address again when performing read/write using ioctl I2C_RDWR via addr in the structure i2c_msg. So then,what is the function of I2C_SLAVE command?Do i need to call it every time i perform a read or write operation? Thank you in advance.

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• ifcfg-eth* on CentOS 6.x, but for IPv6 only?

  - by Ray Hoffman

  Could someone kindly provide a skeleton ifcfg-eth0:[X] for creating an alias with a IPv6 address and no IPv4 address? Or, alternatively, what's the IPv6 equivalent of this: in /etc/sysconfig/network-scripts/ifcfg-eth0:1 DEVICE=eth0:1 ONBOOT=yes BOOTPROTO=static IPADDR=42.69.66.66 NETMASK=255.255.255.0 Or does this not even make sense in IPv6 space? I know that I can use, for example: IPV6INIT=yes IPV6ADDR=2600:4200::6900:6666:dead:beef But then do I need to specify that there is no IPv4 address associated with this alias? If so, how? And do I need to also specify the IPV6_DEFAULTGW? Or can it piggyback on the eth0 (unaliased) gateway, which is specifed, like with IPv4 aliases? EDIT: Answered my own question! The easiest way to accomplish this seems to be not to create an alias as with IPV4, but to specify, for example, IPV6ADDR_SECONDARIES=2600:4200::6900:6666:dead:beef on the script for the base interface, e.g. ifcfg-eth0.

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• Centos Xen resizing DomU partition and volume group

  - by thepearson

  I have a setup like so: Dom0 LV | DomU Physical Disk | | XVDA1 XVDA2 (/boot) (DomU PV) | VolGroup00 (DomU VG) | | LogVol00 LogVol01 (swap) (/) I am trying to resize the DomU root Filesystem. (VolGroup00-LogVol01) I realize that I now need to resize the partition XVDA2, however when I try doing this with parted on Dom0 it just tells me "Error: Could not detect file system." So to resize the root part VolGroup-LogVol00 shouldn't the process be: # Shut down DomU xm shutdown domU #Resize Dom0 Logical volume lvextend -L+2G /dev/volumes/domU-vol # Parted parted /dev/volumes/domU-vol # Resize root partition resize 2 START END (This is where I get an error) "Error: Could not detect file system." # add the vm volume group to Dom0 lvm kpartx -a /dev/volumes/domU-vol # resize the domU PV pvresize /dev/mapper/domU-pl (as listed in pvdisplay) # The domU volume group should automatically adjust # resize the DomU lv lvextend -L+2G /dev/VolGroup/LogVol00 And then obviously increase the fs, remove the device from kpartx etc The problem is I dont know how to resize the partition? How do I resize this partition so I can run pvresize on the DomU? Thanks

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• CheckPoint VPN-1 SecureClient inability to navigate behind a Linksys WAG300N

  - by AndreaTrasatti

  I have a Linksys WAG300N, I'm accessing my LAN with Wifi and everything works fine on my Windows 7 Enterprise laptop. When I try to connect to my company's VPN the connection succeeds, but I cannot access any internet site either within my work network or public site like Yahoo or Google. In my Linksys control panel I already verified all types of VPNs are enable to passthrough. Normal IPSec and Windows VPN worked in the past without any problems. CheckPoint seems to have a solution, but I do not have the ability to change the IP in my client and of course using another NAT device in between is not a solution for me. Edit: adding link to the Checkpoint solution, https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solutionid=sk26189

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• Backup to Synology NAS using rsync or NFS and hardlinks

  - by danilo

  I want to backup data from a Windows (Vista) computer to a Synology NAS (210j). The NAS supports FTP, SMB, NFS and also allows a rsync daemon to be set up. I want to backup different folders to the NAS, but I'd prefer to use the hardlink method to save diskspace (like this script does). With this method, a new folder is created for every backup, but if the file already exists on the target, only a hardlink is created. The filesystem on the Synology device is ext3, so I probably can't use rsyncbackup, as it is made for NTFS. Is there another way to do this backup with hardlink support?

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• How to troubleshoot a GPF?

  - by AngryHacker

  I get a GPF dialog box out of the blue fairly often (like about 2 hours after I turn on the computer). It basically says that svchost.exe had a failure... (see the corresponding Event Log entry below). Event Type: Error Event Source: Application Error Event Category: (100) Event ID: 1000 Date: 5/18/2010 Time: 7:41:16 PM User: N/A Computer: DKHA-IPSA Description: Faulting application svchost.exe, version 5.1.2600.5512, faulting module ole32.dll, version 5.1.2600.5512, fault address 0x0004eaa9. Shortly after this error pops up, the computer pretty much grinds to a halt (e.g. some UI elements on the desktop simply do not respond). And I have to do a hard reboot. How do I troubleshoot this type of thing? P.S. The PC has all the latest patches and nothing is missing in the Device Manager.

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• Backup strategy for Windows Server 2008 R2 and Hyper-V

  - by winserveradmin

  I am in the process of planning a Hyper-V deployment with SCVMM 2008 R2. I have several VMs on VMWare Player (temporary solution) for stuff like Sharepoint 2007, 2010, and a couple of other server apps. I want to develop a resilient backup plan for this. On the software side, Data Protection Manager 2010 will support all of the server apps I run (sQL Server 2008 R2, Sharepoint, Exchange, etc). But on the hardware side (storage), what is the best way to go? Drobo seems to have issues with Hyper-V juding by a few threads on here and doesn't support DPM 2010 (which is in beta anyway) but not even the 2007 version (see http://www.drobo.com/support/best_practices.php). What storage device would work well? Do I need a home server or just an external usb drive? Capacity wise, 2tb will probably be best so I can have a small archive and implement a round-robin system. Thanks

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• External Hard-Drive Randomly Ejects; Stays On

  - by Kaleb F.

  My 250GB I/O Magic USB external hard-drive randomly disconnects / ejects from the computer after between 2-30 minutes of use. When this happens, the blinking activity light on the front of the hdd turns off; however, the disks can still be heard spinning. Unplugging & replugging in the USB does not reconnect the device and the activity light remains unlit. The only way to continue using it is to flip off then on the power switch of the hdd. The hard-drive was formatted with MBR partition table and 2 NTFS volumes. I recently tried switching to GUID with two Mac OS Extended (Journaled), but the problem remains. This error occurs with my new Macbook Pro with Snow Leopard as well as with my DELL E520 with Windows 7 Ultimate.

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• Resizing an iscsi LUN on an EMC under Linux RHEL 5

  - by niXar

  I expanded a LUN on my SAN (from 30G to 50G), and tried all kind of voodoo but it looks like the system still believes the device is still small, despite showing me the new size alright. # blockdev --getsize64 /dev/sdl 53687091200 # dd if=/dev/sdl skip=$(( 31*1024*1024*1024/512 )) count=1|hexdump -C dd: reading `/dev/sdl': Input/output error The dd line works for blocks below the 30G original size. If I reboot, the problem goes away, but I don't want to since the machine has a dozen VMs running. I tried various magic, such as: iscsiadm -m node -R -I iface0 ... to no avail. Note: I'm not using multipath.

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• Event Tracing for Windows GUI

  - by Ian Boyd

  i want to view tracing events from the Event Tracing for Windows system. As far as i can tell the only client program that exists for connecting to providers is a command line tool that comes with the Microsoft Windows Device Driver Development Kit (DDK), e.g.: tracelog -start "NT Kernel Logger" -f krnl.etl -dpcisr -nodisk -nonet -b 1024 -min 4 -max 16 -ft 10 –UsePerfCounter ... tracelog –stop It then requires a separate command line tool to convert the generated log file into something usable, e.g.: trcerpt krnl.etl -report isrdpc.xml Has nobody come up with a Windows program (ala Performance Monitor, Process Monitor, Event Viewer) that lets me start tracing by pushing a "Go" button, let me see events, and i can stop it with a "Stop" button? Is there GUI for Event Tracing for Windows?

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• USB MFP print server that works with Windows x64?

  - by hangy

  Right now, we are using the Longshine LCS-MFP101-2 to connect to our MFP device (printer/scanner combo) over LAN. However, the required driver (RMVUSB, Remote Virtual USB) cannot be installed on 64 bit Windows operating systems such as Windows XP x64 or Windows 7 x64. Since the distributor lists the product as "phased out", I do not expect any updated 64 bit drivers any time soon. :/ Because of that, I am searching for a relatively cheap SOHO MFP print server (1 USB port should be enough) which can be used with 32 bit and 64 bit versions of Windows. Do you have any ideas or recommendations? Thanks!

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• CORAID using only 1 of the 2 available NICs for AoE traffic

  - by Peter Carrero

  We got 6 CORAID shelves in my workplace. On 2 of them I see AoE traffic on only 1 of the 2 NICs that are attached to the SAN switch. We got jumbo frames enabled on all devices. Both NICs show up when I issue the aoe-interfaces command. This wouldn't bother me too much if the throughput performance observed on the "bad" shelves using bonnie++ wasn't half of the result of the "good" shelves. The "good" shelves are older SR1521 model and they have ReiserFS on their LUNS - not that I think it makes a difference - and the "bad" shelves are newer SR2421 model and have JFS. Any help as to what is going on and how to rectify this would be greatly appreciated. BTW: even the lower performing shelves outperform another iSCSI device we got, but that is another story... Thanks.

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• Can't Install Windows 2008 R2 on Lenovo Laptop With SSD

  - by Ben

  I am trying to install Windows Server 2008 R2 on a new Lenovo X201 or T410 laptop. Setup halts with the following pop-up: A required CD/DVD device driver is missing. If you have a driver floppy disk, CD, DVD, or USB flash drive, please insert it now. Note: If the windows installation media is in the CD/DVD drive you can safely remove it for this step. The CD drive is obviously working, as it's booting from CD to get to this point. The only thing I can think is that it is to do with the fact they have SSD disks in - but that's just a guess. (Edit - One extra thing that may or may not be relevant: it's the 64 bit version of Server 2008 R2)

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• No sound on Debian unstable Intel Corporation 82801JD/DO (ICH10 Family) HD Audio Controller

  - by Dave Roger

  I have no sound on my Debian unstable. # cat /etc/issue Debian GNU/Linux squeeze/sid # lspci |grep -i audio 00:1b.0 Audio device: Intel Corporation 82801JD/DO (ICH10 Family) HD Audio Controller (rev 02) # lsmod | grep -i snd snd_hda_codec_realtek 235506 1 snd_hda_intel 19907 0 snd_hda_codec 54244 2 snd_hda_codec_realtek,snd_hda_intel snd_hwdep 5380 1 snd_hda_codec snd_pcm_oss 32591 0 snd_mixer_oss 12606 1 snd_pcm_oss snd_pcm 60471 3 snd_hda_intel,snd_hda_codec,snd_pcm_oss snd_seq_midi 4400 0 snd_rawmidi 15515 1 snd_seq_midi snd_seq_midi_event 4628 1 snd_seq_midi snd_seq 42881 2 snd_seq_midi,snd_seq_midi_event snd_timer 15582 2 snd_pcm,snd_seq snd_seq_device 4493 3 snd_seq_midi,snd_rawmidi,snd_seq snd 46446 11 snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device soundcore 4598 1 snd snd_page_alloc 6249 2 snd_hda_intel,snd_pcm # cat /proc/asound/version Advanced Linux Sound Architecture Driver Version 1.0.21. # uname -r 2.6.32-5-amd64

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• win7 amd64 guest in kvm does not have sound

  - by davidshen84

  hi, my host system is gentoo amd64, guest system is win 7 amd64. the guest system can work, except it does not have sound. i start kvm with -soundhw ac97, QEMU_AUDIO_DRV='alsa', and after i get into the guest system, i can see a 'Multimedia Audio Controller' in the device manager. but win7 cannot find the driver for it. i searched the network for a long time, and i cannot find a driver for intel ac97 for win7 amd64. i also tried -soundhw sb16, es1370, none of them work. please help me fix this.

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• LVM2 vs MDADM performance

  - by archer

  I've used MDADM + LVM2 on many boxes for quite a while. MDADM was serving for both RAID0 and RAID1 arrays, while LVM2 where used for logical volumes on top of MDADM. Recently I've found that LVM2 could be used w/o MDADM (thus minus one layer, as the result - less overhead) for both mirroring and stripping. However, some guys claims that READ PERFORMANCE on LVM2 for mirrored array is not that fast as for LVM2 (linear) on top of MDADM (RAID1) as LVM2 does not read from 2+ devices at a time, but use 2nd and higher devices in case of 1st device failure. MDADM reads from 2 devices at a time (even in mirrored mode). Who could confirm that?

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• WD My Passport Essential SmartWare External Hard Drive

  - by Acer

  Hi Ive been gifted a My Passport SmartWare External Hard Drive(500gb). I used it and it works fine and installed WDSmartWare The Second time i used it,still fine,but I took it out without using the "Safely Remove Hardware" So the third time I used it,there's a bubble come out that says: USB Device Not Recognized One of the USB devices attached to this computer has malfunctioned, and Windows does not recognize it.For assistance in solving the problem, click this message. I tried connecting it to other USB Ports but it didn't work I tried Uninstalling WDSmarWare and connect it but it didn't work Please help me I like this hard drive so much and I spoilt it easily XD P.S I think about 13% has been used up in the Hard Drive P.S.S Other USBs can work fine in the computer P.S.S.S I tried connecting it to other computer and works fine OMG

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• Does the Win XP/7 dual boot "missing restore points" problem apply to systems with separate hard disks for each O/S?

  - by Robert Oschler

  I'm in the process of installing Windows 7/64 on a system with Windows XP/32 on it. During my research, I read about a problem that occurs in the dual boot scenario where Windows XP deletes Windows 7's restore points when it accesses the Windows 7 volume: http://support.microsoft.com/kb/926185 I found a workaround but it seems pretty painful since it appears to involve using the registry to make the Windows 7 volume appear invisible or "offline" to Windows XP, making sharing disk data between the two O/S annoying since you have to use something like an external storage device to get it done: http://www.vistax64.com/tutorials/127417-system-restore-points-stop-xp-dual-boot-delete.html I was wondering if this problem only occurs with systems that have both O/S installed on the same physical hard drive (in different partitions)? In my case, I will have each O/S on a completely separate physical hard drive. Any other tips would be appreciated. -- roschler

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• Load balancing and HTTPS strategies

  - by Dan

  I am faced with the following problem: Servers get saturated since current load balancing strategy is based on client IP. Some corporate clients access our servers from behind large proxies so all clients appear with same IP to our load balancer. I think we are using some hardware load balancing device (can investigate further if necessary). We need to maintain session affinity (site is constructed in ASP), so all requests with same IP get routed to the same node. Since all the communication goes over the HTTPS, no request data (like session Id) is available to balancer as a client discriminator. Is there a way to use some other data besides the IP to distinguish between clients and route the clients even when coming from same IP to different nodes? Note: I need to maintain the traffic between the balancer and nodes safe (encrypted).

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• Generate TFTP Content on the fly?

  - by andyortlieb

  I know this isn't the purpose of TFTP, but I'm working in an environment where a lot of different types of devices pull provisioning info from a TFTP server. What I'm developing is a provisioning system that tracks and maintains device configurations, and I would like to have the requested files generated on the fly, much like you could do with any web application. Yes some of these devices can support HTTP for provisioning, but not all of them do, and we want things to be consistent. Are there any TFTP daemons that can provide something analogous to CGI?

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• Recovering Pictures & Movies from Formatted Memory Card

  - by Donotalo

  I thought I've copied all of the pictures and videos that I've taken using my digital camera Canon Digital IXUS 860 IS to my computer. Then I format the memory card. Then I found I didn't take all of the files! I don't have any other means of connecting the memory card to computer except via the camera. But the camera doesn't show it as a removable device directly in my computer so programs like Glary Utilities and PC Inspector didn't find the drive. I didn't take any picture after I formatted it. Is there any free software that can help me to get the pictures and videos? My memory card is an 4 GB SDHC card. Thanks.

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• Scanner Installation: Epson Perfection 3170 Photo, Windows 7 & Adobe Acrobat

  - by Galaxy5727

  I installed the Driver v3.04A from Epson's Web site -- epson12180.exe that is supposedly for Windows 7. Now, the scanner works by itself, i.e. if I hit the scan button I get a dialog menu and can scan with one of the options there but not with Adobe Acrobat. What I need is to have it working from Adobe Acrobat when I go File - Create PDF - From Scanner - Custom Scan... The current state is that I see Scanner: "Please select a device" and no other available devices. I remember I used to see at least 2 other like "WIA Epson Perfection" and smth like "Epson Perfection". "WIA Epson Perfection" is the option that I am hoping to see to move on. Scanner: Epson Perfection 3170 Photo System: Windows 7, 64-bit Software: Adobe Acrobat 9 Pro

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• How could two processes bind onto the same port?

  - by Matt Ball

  I just ran into an issue where a request made to localhost:8080 from curl was hitting a different server than the same request made from inside Node. lsof -i :8080 revealed that two processes were both binding onto the same port: COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME node 51961 mball 14u IPv4 0xd980e0df7f175e13 0t0 TCP *:http-alt (LISTEN) java 62704 mball 320u IPv6 0xd980e0df7fe08643 0t0 TCP *:http-alt (LISTEN) How is this possible? Were they binding onto different interfaces? Or was it the IPv4 vs 6? If you're curious, node was hitting the other node process, curl was hitting the java process. The java process was started after the node process.

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• Do Seagate Momentus XT SSD Hybrid drives perform better than a good hard drive + flash on ReadyBoost

  - by Chris W. Rea

  Seagate has released a product called the Momentus XT Solid State Hybrid Drive. At a glance, this looks exactly like what Windows ReadyBoost attempts to do with software at the OS level: Pairing the benefits of a large hard drive together with the performance of solid-state flash memory. Does the Momentus XT out-perform a similar ad-hoc pairing of a decent hard drive with similar flash memory storage under Windows ReadyBoost? Other than the obvious "a hardware implementation ought to be faster than a software implementation", why would ReadyBoost not be able to perform as well as such a hybrid device?

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• Gateway time out connecting to tethered server from Android

  - by BentFX

  I've got an Android device running android-wifi-tether. It works as advertised. I connect to it from my Ubuntu 12.04 laptop running Apache 2.2.22. The laptop is manually configured to IP 192.168.2.100 in the hosts file. It can ping itself and access it's own web server through that address. The WiFi tether hotspot gives the laptop the same 192.168.2.100 address(Laptop was configured to match the hotspot address as a troubleshooting step, and could be wrong.) Using ping I can ping the laptop from the phone using the 192.168.2.100 address. Using portscan the phone shows port 80 open on the 192.168.2.100 address. So, everything looks like it's in place, but any attempt to browse to http://192.168.2.100 fails after a few moments with a 504(Gateway time out) Any help would certainly be help.

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