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• How to recover from a drive failure in a RAID 5 configuration?

  - by Philip Fourie

  This morning a drive failed on our database server. The drive array (3 disks) is setup in a RAID 5 configuration. While we wait for a drive replacement we are preparing for a recovery strategy. Users are continuing to work on the system, albeit very slowly (don't know why??). How does one install the new drive - will the data for this drive automatically be rebuilt from the parity or is there another process we should follow? Edit: This is a hardware RAID controller. (Thanks for the answers so far, appreciated)

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• Alternative to Windows Home Server (WHS) backups

  - by Adam Tegen

  Since Microsoft announced the end of life for WHS, are there any alternatives? Specifically, I am interested in recovering from a catastrophic disk failure with WHS. For example, this is my ideal scenario when a desktop hard-drive fails (has a bad virus, etc): Install a disk of the same size or greater Boot the desktop with the Recovery Disc Point the recovery application at the WHS Pick the machine, the drive(s) and the date of the backup Have a couple beers Reboot to a working machine as if nothing happened. I would need to slap multiple disks in the machine without raid. It sounds like LVM will work here. It would be nice, but not required to have de-duplication of files when multiple machines are backed up. (Single Instance Storage)

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• RAID10 without write-back cache = horrible write performance?

  - by Harry Mexican

  I have just provisioned a dedicated server on singlehop. I'm running it through some tests to know what to expect performance-wise. On the I/O side (with 4 1TB disks in RAID 10) I get: write-cache disabled 200 MB/s read throughput 30 MB/s write throughput I thought that was really low compared to my desktop HD which gets 150-150 or so. So I had a chat with them and they suggested enabling the write cache. New results: write-cache enabled 280 MB/s read 260 MB/s write which is great and all but means I'd have to add a BBU for an additional monthly cost. Is it normal for the write throughput to be 1/4 of a regular drive on RAID10, if you don't have write cache? It almost feels like its intentionally bad to force you to pony up for the BBU. I'd be happy with normal non-raid performance of 150/150.

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• How to persist changes to instances in the cloud.

  - by Peter NUnn

  Hi folks, I must be missing something here, but can someone clue me in on how to persist changes (such as software installs etc) on machines in the cloud (either EC2 or my own Eucalyptus cloud). I have instances running.. can attach extra disks to them etc., but every time I terminate the instance, all of my changes are lost the next time I run them. Now, this sort of makes sense in that the instances are virtual, but, there must be some way to make these changes persist. I'm just missing how its done. Thanks. Peter.

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• Mac Disk-Utility input/output error

  - by Michelle

  a couple of other people have posted about this but my specific problem has not been addressed. For months I have been backing up DVDs and home movies with no problem then all of a sudden I get an "input/output" error. Yes I have cleaned the disks. Actually I have tried 8 different ones - they are not all bad so its obviously my computer. I have done a scan and cleaned up the HD a bit just in case but nothing is helping. I don't want to download other programs since this one works but seems to be having a problem. Any ideas?

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• What causes "All-in-one USB Card Reader" to create 6 drives that always appear in Disk Management?

  - by tim11g

  I installed a "All-in-one USB Card Reader" to read SD cards and other media. It has caused six new drives to appear in Disk Management with six new drive letter assignments. These drives and letters are always present, even when there are no cards in the reader. When unused, they are labeled "No Media". Why does this multifunction reader cause these phantom Disks to appear and consume drive letters? Every USB port can (and does) allow removable media to be mounted and assigned a drive letter, and the drive letter assignment "disappears" when the USB drive is removed. Why are these card reader's drives and letters staying allocated permanently? Is there anything that can be done to make the slots work like a typical USB drive? (The reader is in fact connected to USB).

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• How can I connect a SAS drive to USB? [closed]

  - by dave

  I have a Dell T710 with Seagate Cheetah 15k.7 SAS disks. If the T710 motherboard dies, I'll need to resort to one of my nightly off-site backups and salvage the journal/logfile from the SAS disk to bring the backup bang up-to-date. I need a way of reading the healthy-but-inaccessible SAS disc that does not depend on the only SAS-capable machine I have to hand. So I bought: SAS to SATA Adapter and: USB 2.0 to SATA Adapter with Power ...so that I could read the SAS drive via USB. I can plug it all together just fine. The chain looks like: USB - SATA - SAS. But the drive does not spin up and the computer doesn't even acknowledge anything being attached by USB. Is there a cheap external enclosure I can buy for SAS drives? I can't believe these USB to SATA adapters are everywhere but the USB to SAS adapters are almost non-existent...

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• There are no drives listed during windows 7 system recovery

  - by Kragen

  I'm trying to use the Windows 7 system recovery disk to repair a boot sector, however I'm finding that when I boot the recovery disk, it doesn't list / mount any of my disk partitions, and so I can't perform the recovery. The partitions are all NTFS formatted, and the drivers used to read the disks all seem to be fairly straightforward Microsoft drivers, so I shouldn't need to load any extra drivers to see my partitions (its a Dell Latitude D530) Diskpart correctly lists the partitions (complete with labels) - it just that when I attempt to switch to that partition it gives me the "This partition does not contain a recognised file system" message. Has anyone got any idea how I can work out why my partitions are not visible?

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• Windows 8.1 upgrade created a second recovery partition. Can I remove the original?

  - by Dave S

  Windows 8.1 upgrade created a second recovery partition. Can I remove the original? Prior to this the partitions were Recovery, EFI, OS(C:), Data(D:). After the upgrade partitions are Recovery, EFI, OS(C:), Recovery, Data(D:). The first Recovery partition is 1023MB the second is 350MB The "Create a system image" tool selects the EFI, OS(C:), and the second 350MB Recovery partitions. The first 1023MB Recovery partition is not listed, I have to "assume" it is now redundant. The factory (HP) Recovery Partition was removed using the HP provided tool after creating recovery disks, and the D: partition created months ago.

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• Very slow disk performance on Dell PowerEdge 2950 w/ PERC 6/i running RAID 10

  - by vocoder

  I recently set up a server running Ubuntu 10.04 LTS on a Dell PowerEdge 2950 server - it has 6 500 gb 7200RPM SATA drives setup in a RAID 10 config. I am seeing extremely poor disk performance - the RAID array reports all disks are normal and using MegaCLI, it looks like the BBU is fine. hdparm -tT /dev/sda reports: Timing cached reads: 90 MB in 2.05 seconds = 43.96 MB/sec Timing buffered disk reads: 24 MB in 3.11 seconds = 7.72 MB/sec So as you can see, it takes forever to something as simple as an apt-get upgrade and even logging into the server. How do I go about troubleshooting what is causing this? I upgraded the firmware on the PERC 6i RAID controller to the latest, but didn't see any improvements.

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• differencing disk opinions

  - by troth

  I've read about the performance issues with dfferencing disks but I still think there is a solid place for them and thats the os boot partition. If I'm going to have 20 vms on a csv based volume I don't won't to waste the 20+ gigs per guest just for the os boot. If I get a good base disk with all of the most used applications installed and have the pagefile located somewhere else I don't think the delta's would be that great thus it should not create a performance issue. Also in a SAN based csv volumes does it make any sense in having the pagefile go to a seperate csv volume? Any opinions on this? thanks

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• Time Machine for Windows

  - by Kevin L.

  A simple Google search for "Time Machine for Windows" results in a flurry of different little apps. But instead of relying on forum anecdotes and advertisements, I call on the much wiser Super User beta community for some depth on this one. Having Time Machine running on Leopard is like a warm, fuzzy blanket of comfort that I never got with RAID, rsync, or SyncToy on Windows. I'm not asking the community what the "best" backup software for Windows is, but instead: Is there any true Time Machine clone for Windows, one that includes as many of the following as possible: Completely transparent, "set-it-and-forget-it" backup Incremental backups (changes only) for every hour for a day, every day for a month, and every week until the backup disk is full Ability to rebuild from this backup disk in case of main drive meltdown (the backup doesn't have to be bootable; neither are Time Machine disks) Extremely easy to use UI (target user == wife). Bonus points for a beautiful UI

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• RAID-0 problem with a Sony sporting a new HDD

  - by redrock

  Sony Windows 7 PC. Originally had 2 x 300 Gb HDD. One HDD completely pancaked so have replaced with a new 500 Gb HDD. When both drives are connected the 300GB doesn't appear to be recognized as a 300Gb HDD as a separate entity. BIOS sees it but the operating system only sees a total of 465GB of HD space. When both disks are attached under disk management it shows one 465Gb as RAID 0 and the new drive as STxxxxxx 465Gb. My question I guess is what should I see in total HDD space and is this configured correctly as I thought I would see 2 separate drives 1x500Gb and 1x300Gb. My customer insisted that prior to the HDD crash he saw 2 drives both registering as 300Gb (a c: and d: drive).

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• SBS 2003 R2 install errors

  - by piagetblix

  I just installed sbs2003 R2 as a learning lab box on my home network. The install seemed to take quit a while with a bit of shuffling between disks 4 and 5. The continue setup checklist showed the red x besides the exchange install and finally gave me an error about the "schema needing extending run, forest /adprep" and told me at the end that the install did not succeed. After a longer than normal reboot it comes up and seems to be OK. What logs do i need to check to see what went wrong? Should i reinstall and try burning the iso's to new media? cheers

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• Hardware upgrade: Windows 7 bluescreens, Vista loads

  - by Daniel Schaffer

  I just did a fairly significant hardware upgrade while keeping my hard disks. The old system was a dell Optiplex 745 with an Intel Core 2 duo, LGA 775. The new system is custom built, Intel i5 750. I know you're supposed to do a clean install with a hardware upgrade like this, but I'd had success in the past doing the stealth hardware upgrade like this, so I figured I'd give it a shot. Windows 7 Ultimate 64 bit gets through the loading screen and immediately blue screens and reboots. Windows Vista Home Premium 32-bit, which I have on an old hard drive from an AMD box (!!) loads up fine. I ran through the windows memory checker just to be sure, and my memory is fine. So, is the BSOD the result of some sort of protection mechanism specific to Windows 7? Is there any hope of salvaging that install?

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• FreeBSD: Samba performance over GBit-Ethernet

  - by Axel Gneiting

  I'm using a FreeBSD NAS with RAID-Z. I can read ~300MB/s from the ZFS disks to /dev/null on the box, but only get about 50MB/s over GBit-Ethernet with SMB to Windows 7 (Samba 3.5.6). Both systems have Intel-PCIe-NICs and are connected directly. Samba is configured to use AIO and I already tried to tune TCP/IP: kern.ipc.maxsockbuf=16777216 net.inet.tcp.sendspace=1048576 net.inet.tcp.recvspace=1048576 net.inet.tcp.sendbuf_max=8388608 net.inet.tcp.recvbuf_max=8388608 net.inet.tcp.delayed_ack=0 Any ideas what's causing the bottleneck? I think the link should handle 100 MB/s easily.

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• Home server - HP Proliant Microserver - Software and setup - OS on USB stick?

  - by Lloyd Watkin

  I've just purchased a HP ProLiant Microserver for home use. I want to set up with web server, samba shares, the usual stuff. My question is really about system setup. It has an internal USB socket so I've attempted to install a copy of Fedora 14 onto it. I turned off X/Gnome, but it still ran like a pig. I've now put the OS on one of the internal disks (250Gb, 7200rpm), but I was wondering if there was a way to utilise the internal USB to give me better power-saving allowing the hard drives to be shut down when not in use. How would you set this server up? I'd rather not go to the extra cost of an SSD right now, but if that's the best way then so be it.

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• Resize Ubuntu Linux system to smaller disk inside VMware ESXi

  - by mlambie

  I have several Ubuntu Linux virtual machines running on VMware ESXi hosts that have all been allocated disks much larger than their required capacity. As space is now becoming an issue on our SAN, I'd like to investigate downsizing the allocated disk space on these machines. All systems will be completely backed up imaged before I begin making changes, and I will always retain a pristine backup in case the partition resizing does not work. Is there an easier way than the following procedure, or is their a better solution entirely? Shutdown and assign a second disk to the virtual machine Boot using the SystemRescueCD Use GParted to resize the original (source) partition, making it smaller Clone the new, smaller partition to the second disk Shutdown and remove initial disk from the virtual machine Reboot and force fsck to check the filesystem

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• Supermicro SmartOS setup issue with HDDs

  - by Andrew B.

  I'm trying to setup SmartOS on my new Supermicro server (SYS-6027R-N3RF4+). I have 8 HDDs + 2 SSDs installed in the hot-swappable drive bays. I have not configured the Intel RAID controller on the machine (it shows no RAID configured, and lists all 8 HDDs). When I boot SmartOS from my USB key for the first time and get to the initial zpool creation I only see 2 disks listed. How can I tell which two drives are being referenced? How can I get SmartOS to recognize all 8+2 drives? Is there a BIOS setting I need to adjust?

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• How to create Raid 10 with megacli

  - by Henno

  I have OpenFiler storage server. Without installing Windows and MSM, I want to create raid10 array from disks 2 to 21. I have already successfully installed MegaCli to OpenFiler but I'm stuck in figuring out the correct command line for creating a raid 10 array. The documentations says that the syntax for creating a raid 10 is: MegaCli -CfgSpanAdd -r10 -Array0[E:S,E:S] -Array1[E:S,E:S] -aN My enclosure ID is 25, so: [root@linux-h5ut ~]# MegaCli -CfgSpanAdd -r10 -Array0[E25:S02,E25:S21] -Array1[E25:S02,E25:S21] WB Cached NoCachedBadBBU -a0 Invalid input at or near token E I have googled high and low but there doesn't seem to be any example doing raid10 with megaraid (only the syntax). Can anyone explain what is wrong?

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• aligning truecrypt partition on 1.5TB 4kB sector drive

  - by pQd

  hi, aligning partitions to start at real physical sector of ssds / stripped raids / 4kB drives is a 'good thing to do'. but i've run into a problems when trying to do it for a truecrypt partition that will contain ext3 on it. or so it seems. when drive is question is partitioned properly and formatted with ext3 i get very reasonable write speeds around 70-80MB/s, but when i put truecrypt and ext3 on the top of it write performance becomes very unstable and goes between 1-25MB/s with very high io-wait. on the same server i dont have any performance issues with ext3 on the top of truecrypt on regular 512B-sector 500GB sata disks. so my best guess is that iowaits are caused by misalignment but i cannot really find reliable information on how to calculate optimal partition beginning. i've tried to start it at 128 logical sector, i've also tried 8132 sector as suggested here but both gave me very bad and unstable performance. do you have any experience with similar setup? thanks!

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• RAID0 PROBLEM WITH A SONY SPORTING A NEW HDD

  - by redrock

  Sony Windows 7 PC. Originally had 2 x 300Gb HDD. One HDD completely pancaked so have replaced with a new 500Gb HDD. When both drives are connected the 300GB doesn't appear to be recognised as a 300Gb HDD as a seperate entity. BIOS sees it but the operating system only sees a total of 465GB of HD space. When both disks are attached unde disk management it shows one 465Gb as RAID 0 and the new drive as STxxxxxx 465Gb. My question I guess is what should I see in total HDD space and is this configured correctly as I thought I would see 2 seperate drives 1x500Gb and 1x300Gb. My customer insisted that prior to the HDD crash he saw 2 drives both registering as 300Gb (a c: and d: drive).

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• Where can I legally download Windows 7 OEM ISOs?

  - by Iszi

  I have a friend who has gotten a serious virus infection and needs her computer rebuilt. However, the computer did not come with any re-installation disks from the OEM and she doesn't have any good backups. I have a TechNet subscription, but I understand that the OEM product key attached to her computer should not work with the Retail or Volume License images I can get from TechNet. Is there anywhere I can legally download a copy of Windows 7 that will work with an OEM key, directly from Microsoft? I'd rather avoid having to work with the OEM's technical support and possibly have to pay for them to ship a disc that (IMHO) the system should have come with in the first place.

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• Preparing a new physical system with VMWare

  - by Max

  I need to create a new installation of Windows, but at the same time I need this computer. So I decided to create a new physical disk from within VMWare, install windows/drivers/software and then just replace the HDD in the computer. I've bought a new HDD, split it into two partions and installed Windows 7 using the VMWare's ability to use phusical disks. I can see the windows files and directories that have been created on this partition, but when I'm replacing the HDD in the host machine it cannot boot from it. Why is that? Is it at all possible to create a bootable physical disk with VMWare or I should create a virtual disk and then use some HDD imaging tool to copy the HDD image to a physical disk? Maybe there's a better way of installing a new system and working on the computer at the same time?

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• Kernel panic error

  - by cioby23

  We have a dedicated server with software RAID1 and one of the disk failed recently. The disk was replaced but after rebuilding the array and rebooting the server freezes with a Kernel Panic message No filesystem could mount root, tried: reiserfs ext3 ext2 cramfs msdos vfat iso9660 romfs fuseblk xfs Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(9,1) The filesystem on both disks is ext4. It seems the kernel can't load ext4 support. Is there any way to add ext4 support or do I need to recompile a new kernel again ? Interesting point that before disk replacement all was fine. The kernel is a stock kernel bzImage-2.6.34.6-xxxx-grs-ipv6-64 from our provider OVH Kind regards,

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