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  • Large file copy from NFS to local disk performance drop

    - by Bernhard
    I'm trying to copy a 200GB file from an NFS mount to a local disk. The local disk is an XFS filesystem on a LVM on top of a RAID 5 system (hardware RAID controler). I'm using rsync to monitor the transfer speed. At the beginning the IO speed is about 200MB/s, stable for the first 18GB. But then the performance drops by a factor of 10-20 and never recovers to the initial rate. Sometimes it reaches about 50-100MB/s but just for a few seconds and then the process seems to hang for a bit. At the same time all file-stat operations on the target filesystem are blocking for a long time (minutes). Also interrupting the copy process blocks for several minutes, a sub-sequent delete of the partly copied file takes also several minutes. Any ideas what could be causing this?

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  • Media disconnected Acer Aspire Win 7 Starter

    - by RoadGlide
    Problem setting up wireless connection on my new ACER Netbook using Win 7 Starter. Works fine with LAN cable from NETGEAR WGT624V3 router with updated firmware. The NETGEAR does not see the ACER, but does see my XP Laptop. I'm also running a wireless, BlueRay DVD. When I run getmac I get hardware not pesent, my mac address, Hardware not present. Is there a switch that needs to be set?

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  • Setup VPN network for PS3

    - by L Franco
    Getting informed on setting up a home network so i can use VPN on my PS3, i live in Mexico but want the programming available in the US. Getting a little confused as every sites gives you different options, both in hardware and software. specially on subjects like dd-wrt, dns or vpn options... i know there is no "best" setup, but are there any tried and true?? Options in hardware and software would be apreciated...

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  • Windows 8.1 and fingerprint readers

    - by Sevenate
    Is there any build in UI for that kind of hardware like it exist in Modern UI for WiFi, Bluetooth, Broadband mobile and other common settings or I'm forced to use separate software (besides the obvious drivers for hardware)? The thing is that I have build-in fingerprint reader in my laptop and I have installed all necessary official drivers for it (and it looks like they are working fine, btw). But I did not find any UI settings where I could change Sign-in option from password/picture password/pin to fingerprint.

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  • Vista stuck at "Shutting down..." screen. Any way to get verbose logging?

    - by CapBBeard
    Hi all, My home machine has been running fine for about 3 years, no problems at all. Within the last couple of weeks it's had real trouble trying to shut down. It'll get so far and then just sit there at the "Shutting down..." screen for hours. I've left it overnight, I've tried in safe mode, all to no avail. These days, I just wait for the disk activity to finish up and then hold the power button to turn it off. Feels dirty as, especially because there's a RAID involved! The hardware itself is in pretty good shape and of decent spec; Core 2 Quad, 4GB RAM, 1TB RAID 1+0, so it's not quite like a 7 year old PC coming to end of life! In the last month, hardware hasn't changed except for a new monitor. Admittedly I haven't tried unplugging the monitor but I've never heard of that preventing a shutdown. I might give it a whirl later I guess, as a last resort. I've uninstalled old apps, done updates, checked the event log, looked in device manager, uninstalled all non-present devices, disabled various non-critical devices (imaging, audio etc), unplugged peripherals, stopped non-essential services, unplugged the network, disabled the network adapter entirely, ran chkdsk, verified my RAID, the list goes on. But not a single lead. I'm pretty stumped. It could be hardware, but I have no other evidence to suggest so; when the PC is running, it runs fine. Temperatures are good, gaming is smooth as always, disk performance is fine. Event log even makes it look like the shutdown was completed (gets to the point where the event log service stops). In fact, the PC doesn't appear to realise that I cut the power to it. So my question is, does anyone know if there is a way I can get some verbose output (or a log) from shutdown to give me some idea of what is causing the issue? I'm guessing it's stuck unloading some app/driver but it would be good to get some specifics! Unless anyone has any other ideas? I suspect a reinstall would resolve the issue, however I'm looking to get a new PC built in the next month or so, and the reinstall is going to be quite a big job so I'd rather just wait until then if it comes to that. Would still be nice to get this sorted in the mean time though. Cheers!

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  • fdisk -l only displays boot partition

    - by Franklin
    I have a SAN, and it's able to read and write to the 50TB RAID just fine, but when I run fdisk -l it only lists the boot partition of the SAN server, and doesn't display anything about the other partitions on the RAID. I've also tried using parted -l with the same result. Now when I type mount it shows that the partitions are mounted just fine. I've never seen this happen. The box is running Openfiler 2.3 (I know it's old, we're in the process of upgrading all our old equipment). We have another SAN that's configured almost identically, and it's able to display the partition info with either of the two commands I mentioned above.

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  • What would cause the Graphic Equalizer in Windows Media Player 10 to be disabled/not available?

    - by creamcheese
    On XP, Windows Media Player 10 contains a Graphic Equalizer but I can't find any way to activate it. Could this be a codec issue or a hardware issue? I'm also not getting any sound at all from this computer but there are no apparent hardware device issues marked in Device Manager, nothing is muted, all volume levels are turned fully up (Windows Media Player and the Windows Volume Controller). Stumped!

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  • hybrid cable for QSFP to CX4 convertion

    - by John-ZFS
    here is a hybrid cable for QSFP to CX4. Will this fit SFP+ ports? Deeply confused by standards and struck in a situation with wrong hardware selection!Personally have not seen the ports/hardware and hence the obviously stupid question! thanks for stopping by and bearing with me. http://www.cablesondemand.com/pcategory/72/category/QSFP+-+CX4/URvars/Catalog/Library/InfoManage/QSFP_TO_CX4_COPPER_CABLES.htm

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  • SATA controller installed but not working? (No drives show up/Don't see card's BIOS)

    - by johnnycakes
    Hi, I have an old Promise FastTrak S150 TX4 SATA controller card. I put it in an old machine running Windows Server 2003. I booted the machine. The new hardware was detected. I installed the drivers. So now in Device Manager under "SCSI and RAID Controllers" I see "Win Server 2003 Promise FastTrak S150 TX4 Controller" and "Win Server 2003 Promise RAID Console SCSI Processor Device" I previously had the card in a machine that is now dead. When I booted that machine, during the boot process I would see the card info displayed and the drives that were attached. Boot would finish and my drives would be available. When I boot this new machine I never see that screen/text. No hard drives are available/visible. What am I missing? Thanks.

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  • How to use 3T SAS HDDs which aren't supported by Dell PERC 6i

    - by Sunry
    We bought several 3T SAS hard disks want to use with our Dell R710 server. But we found our R710 can't recognize the 3T hd, and then we dig out the raid card is PERC 6i which doesn't support it. Contacted with Dell that H700 and H800 support 3T hd, thought we can buy a H700 , but the SAS cable is not available in the market right now. And it seems very hard for us to change the raid card, also no suitable tools to tease the special screws. So I want to know if any other method to use these 3T hds instead of putting them in the warehouse? Can I low formatting it to 2TB, and plug it into Dell R710 to use? Or a SAS to USB adapter to use it as USB external disk? I just want to use them by Dell R710 even external.

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  • How can I combine non-identical disks efficiently?

    - by Odys
    There are some not-identical disk of various capacities that I want to combine (somehow). Since there are no duplicate models, I can't use raid between none of them. Is there a way to use them efficiently while being safe? What I have in mind is a software that will use them as if it were Raid-5 or something. I really don't care about max speed. I want in the end to have as less logical drives as possible. Also, I don't mind spending some money on hardware, if needed.

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  • Can someone explain what causes extra heat in a CPU

    - by BlueTrin
    I have a hardware question about CPU and chips in general: what is causing the extra heat when CPUs are busy doing computations ? I thought that the CPUs would have a way to throttle themselves when they are not busy but it seems that only applies to some mobile CPUs, so my question is how do CPUs manage to generate less heats when performing less computations and what causes the heat in the hardware when the workload increases ?

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  • Can I get redundancy with a JBOD storage subsystem

    - by Dat Chu
    I have a Promise Technology J610S. This is a JBOD subsystem. Is it possible for me to buy a SAS hardware RAID controller and provide some type of redundancy for these drives? I am unsure whether I will use Linux or Windows yet so an answer with enumeration for both would be highly appreciated. One solution that I thought of was: if my J610s can export each drive as a target, my server will simply see 16 drives. The RAID controller can then perform the RAID5/RAID6 if I want.

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  • Win7 - Chrome: Accelerated rasterization not enabled/not supported

    - by Wozzie
    Win 7 Pro SP1 x64 EVGA Geforce GTX 670 FTW 2gb Geforce Driver: 320.49, it did happen with the previous version of the driver as well Chrome Version 28.0.1500.52 beta-m DirectX: 11 I was looking in chrome://gpu which told me that "Rasterization: Software only. Hardware acceleration disabled." and further down "Accelerated rasterization has not been enabled or is not supported by the current system." Is there a way to enable hardware acceleration?

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  • What SATA drive should I install FreeBSD onto? i.e. ar0 vs da0 vs ad4/5

    - by Matt
    I'm installing FreeBSD 8.0 on a server that has hardware SATA Raid. I'm just wondering. What is the difference between these devices. i.e. ar0, da0, ad4, ad5 I take it that ad4 & 5 are my two disks. Somehow the OS can see them individually even though it's one logical mirrored drive. Should I be installing it onto ar0 or one of the adX disks. What is da0? it's smaller than the others. ar0 is not some kind of software raid device is it? Just want to make sure I don't mess this up right from the get go.

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  • migrating storage to a different controller

    - by bellocarico
    Hello, I've just purcheased a couple of adaptec controller (2405/5405) for my ESXi 4.0 U1 servers. Currently ESXi and a couple of VMs are hosted on single sata boot disk connected to a nvidia on board non-RAID controller. I know that it's possible to migrate from single disk to RAID 1 with adaptec and I'm pleased with that, but I'm not sure if ESXi has already the right drivers installed/loaded for this controller. Is there any way I can check this? Is ESXi clever enough to recognize the new hardware and load the right module? Thanks

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  • Can I change from BIOS IDE mode to AHCI mode at any time?

    - by Software Monkey
    Currently my Windows 7 computer is crashing during startup, after loading the AMD achix64s.sys driver, if I enable BIOS AHCI mode for the disks. It boots fine with IDE mode. Since I need my computer working, I am wondering if I can just use IDE mode for now, and later change to AHCI mode, when I figure out what is wrong. Background: I was running RAID mode, which needed additional drivers to install/boot Windows. But the MoBo RAID is flaky so I'm trying to switch to using a Windows mirrored volume instead - for that I expected to use AHCI mode.

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  • Raid5 is off on my Lefthand P4500

    - by Soeren
    I have 1 cluster with serveral p4500. There is HW Raid5 and the Raid5 is split on: first 6 is one raid 5, and the other 6 is one raid 5. There were two disk that came up with a fault. I replaced both disk in same Raid5. Now the storagesystem says that Volumes is unaccessable and the Raid5 of the P4500 is down. How can I get the lefthand up and working again? Ive tried to put the old disk in the P4500 again, but this does not help. I also tryed to restart the disk shelf as well. Do you have any idea? Or something to get it to work again?

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  • How do I stop ubuntu waiting for me to "Press S to skip of C to continue..." when it fails to mount on startup?

    - by Jon Cage
    I've been having some issues with my RAID setup recently on my headless Ubuntu 10.04 server which means one of my mount requests is failing on bootup. Clearly I need to fix the RAID issue, but this machine is in my loft and having to crawl up there with a keyboard just so I can hit S a few times is extremely irritating. The exact message is as follows: The disk drive for /drv/photos is not ready yet or not present Continue to wait; or Press S to skip mounting or M for manual recovery I'd still like Ubuntu to try and mount it, but is there any way to tell it not to wait for the device?

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  • DD-WRT - Where's the best place to get a LinkSys WRT54G V1.0?

    - by Giffyguy
    Looking for the initial release of the LinkSys WRT54G, not V1.1 or V2.0 or anything like that. If it comes with DD-WRT pre-installed, even better. That being said, I suppose a side question would be whether SU recommends different hardware. After all, DD-WRT may have been originally built for the WRT54G and the WRT54Gv1.0 may have better hardware than any of the successive models, but it's still fairly dated. Are there newer routers that are more stable or performant with DD-WRT?

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  • Error while mounting home directory on different logical volume

    - by RCola
    I created RAID 5 form 3 hard drives. Formatted as ext4 this raid array. Created VG0 group and lv_home logical volume in LVM. Then I tried to mount default /home directory on lv_home, while trying to mount logical volume lv_home to folder containing user profiles /home, getting error: mount: wrong fs type, bad option, bad superblock on /dev/mapper/VG0-lv_home next is seems to be symbolic link: # file -s /dev/VG0/lv_home /dev/VG0/lv_home: symbolic link to `../mapper/VG0-lv_home' then # file -s /dev/mapper/VG0-lv_home /dev/mapper/VG0-lv_home: data and lvm> pvs PV VG Fmt Attr PSize PFree /dev/md0 VG0 lvm2 a- 2.02g 68.00m lvm> lvdisplay --- Logical volume --- LV Name /dev/VG0/lv_home VG Name VG0 LV UUID WzJus7-2yV8-yhog-Ju1b-TpWH-IIAI-LIutwe LV Write Access read/write LV Status available # open 0 LV Size 1.17 GiB Current LE 300 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 251:0

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  • Status: 0xc00000e9

    - by Ryan Galloza
    When I start up windows normally it just freezes , I click "Launch Startup Repair" I get this: "Windows has encountered a problem communicating with a device connected to your computer. This error can be caused by unplugging a removable storage device such as an external USB drive while the device is in use, or by faulty hardware such as a hard drive or CD-ROM drive that is failing. Make sure any removable is properly connected and then restart your computer If you continue to receive this error message, contact the hardware manufacturer" How do I fix this problem?

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  • Duplication of Windows 7 Backup

    - by Steven Pickles
    I use the built in backup utility for Windows 7 because it's automated and flexible enough to allow me to schedule a daily shadow copy backup of particular files and folders directly to a separate internal RAID 0 array (2 x 1TB). It's also lightweight and stays out of the way. For off-site backup purposes, each week I copy the contents of the internal backup from the RAID 0 array to an external 1 TB drive. I then store move this drive to a different building. The copy from the internal backup to the external backup typically works like this: mount and erase contents of external drive highlight "file" on internal drive, hit CTRL+C CTRL+V on root directory of external drive Is there a better way to synchronize? Microsoft's SyncToy application does a pitiful job, and often leaves the folders not truly synchronized... which completely defeats the ability to use the backup's restore feature.

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  • How can virtualization be efficient?

    - by pestaa
    As I understand, the virtual machine and the guest OS doubles the amount of abstraction layers (that are computationally relevant) between the user interface and the pure power of the hardware. Some of the said abstraction layers are (emulated) hardware, drivers, IO interfaces, etc. Top-notch virtualization solutions like Xen probably eliminate a few of these complexities, but I still wonder how efficiency is achieved in these environments; and whether manageable cloud servers are really worth the performance price.

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