+ Post New Thread
Page 1 of 2 12 LastLast
Results 1 to 15 of 21
Hardware Thread, Recovering from RAID fail in Technical; Ok so I have a server with RAID 5 and the array won't rebuild (1 dead disk replaced but two ...
  1. #1

    sparkeh's Avatar
    Join Date
    May 2007
    Posts
    6,717
    Thank Post
    1,267
    Thanked 1,639 Times in 1,096 Posts
    Blog Entries
    22
    Rep Power
    504

    Recovering from RAID fail

    Ok so I have a server with RAID 5 and the array won't rebuild (1 dead disk replaced but two others with read errors), HP's solution is to replace the disks but of course this means data loss.

    The machine is Server 2008r2 running Hyper-V with three VMs.

    Of course I have backups but I have managed to copy the VHDs over to an external hard drive. So wondering if there is any problem with the following:

    -Replace disks
    -Reinstall Hyper-V
    -Copy VHDs back to server, attach and start up again.

    Thoughts?

  2. #2
    alexsanger's Avatar
    Join Date
    Oct 2009
    Location
    London
    Posts
    117
    Thank Post
    21
    Thanked 23 Times in 21 Posts
    Rep Power
    14
    If the array won't repair/rebuild then whatever you do you'll have to replace the disks. Once you've done that and got the server running it should be fine to do exactly what you said, assuming the VHDs weren't corrupted during the RAID failure and copy process. Either that, or restore from backup. Which ever is quicker/easier/you're happiest doing. I guess thats the beauty of using VMs - it gives you options!

    Personally, I'd probably get the server running, then do a full restore from backup, unless there's a compelling reason to use the copied VHDs instead (which you could always do after the restore).

  3. Thanks to alexsanger from:

    sparkeh (7th January 2011)

  4. #3

    plexer's Avatar
    Join Date
    Dec 2005
    Location
    Norfolk
    Posts
    13,274
    Thank Post
    614
    Thanked 1,567 Times in 1,407 Posts
    Rep Power
    412
    Sounds about right

    Will you continue with it in RAID5 or possibly look at RAID6?

    Ben

  5. Thanks to plexer from:

    sparkeh (7th January 2011)

  6. #4

    sparkeh's Avatar
    Join Date
    May 2007
    Posts
    6,717
    Thank Post
    1,267
    Thanked 1,639 Times in 1,096 Posts
    Blog Entries
    22
    Rep Power
    504
    Thanks for the replies.

    @plexer: You know I hadn't thought of that until you mentioned it. Well we currently have 4 disks + 1 spare in RAID 5 Array. So we could use RAID 6... just need to get it straight in my head whether this would be better or not...

  7. #5

    sparkeh's Avatar
    Join Date
    May 2007
    Posts
    6,717
    Thank Post
    1,267
    Thanked 1,639 Times in 1,096 Posts
    Blog Entries
    22
    Rep Power
    504
    Quote Originally Posted by sparkeh View Post
    So we could use RAID 6... just need to get it straight in my head whether this would be better or not...
    Thinking about it the other errors occurred when trying to rebuild the array using the hot spare. I guess with the double parity of RAID 6 this lessens the chance of a failure during a rebuild.

  8. #6

    plexer's Avatar
    Join Date
    Dec 2005
    Location
    Norfolk
    Posts
    13,274
    Thank Post
    614
    Thanked 1,567 Times in 1,407 Posts
    Rep Power
    412
    Yup that would be the most dangerous time for a raid5 array the rebuild because if anything else goes wrong you are screwed.

    Did you run regular consitency checks on your array?

    Ben

  9. #7

    sparkeh's Avatar
    Join Date
    May 2007
    Posts
    6,717
    Thank Post
    1,267
    Thanked 1,639 Times in 1,096 Posts
    Blog Entries
    22
    Rep Power
    504
    Oh the controller doesn't support RAID 6 anyway.

    And no on the consistency checks, not for while. Will do after this though!

  10. #8

    Join Date
    Jun 2008
    Posts
    718
    Thank Post
    119
    Thanked 64 Times in 52 Posts
    Rep Power
    31
    One thing you will find a problem with your VHDs is, is that they will need reactivating again. If you've managed to retain the exact MAC address of each VM and input these into each of them as they were before, then it won't be a problem.

    I'm assuming you simply copied and pasted the VHDs as opposed to doing something fancy.

  11. 2 Thanks to Chuckster:

    sparkeh (7th January 2011), zag (7th January 2011)

  12. #9

    sparkeh's Avatar
    Join Date
    May 2007
    Posts
    6,717
    Thank Post
    1,267
    Thanked 1,639 Times in 1,096 Posts
    Blog Entries
    22
    Rep Power
    504
    @chuckster: Thanks! I hadn't thought about that, the server is still running so I can note these down and make sure they are the same.

  13. #10
    zag
    zag is offline
    zag's Avatar
    Join Date
    Mar 2007
    Posts
    3,738
    Thank Post
    894
    Thanked 414 Times in 348 Posts
    Blog Entries
    12
    Rep Power
    85
    I always keep a spare hyper-v host running with nothing on.

    When something like this happens I'm hoping its just a case of moving the VHD's over.

    You might also want to look at single SSD drives in the future. I've had great success in running a few servers using them. No more mechanical failures

  14. #11

    plexer's Avatar
    Join Date
    Dec 2005
    Location
    Norfolk
    Posts
    13,274
    Thank Post
    614
    Thanked 1,567 Times in 1,407 Posts
    Rep Power
    412
    Quote Originally Posted by sparkeh View Post
    Oh the controller doesn't support RAID 6 anyway.

    And no on the consistency checks, not for while. Will do after this though!
    What controller is it?

    Ben

  15. #12

    sparkeh's Avatar
    Join Date
    May 2007
    Posts
    6,717
    Thank Post
    1,267
    Thanked 1,639 Times in 1,096 Posts
    Blog Entries
    22
    Rep Power
    504
    Quote Originally Posted by plexer View Post
    What controller is it?

    Ben
    HP Smart Array... um can't remember the exact model but its an HP ML350 G5.
    Also regarding checks, I regularly check the HP Array Diagnostic Utility which I presumed would flag up the errors... hmm but perhaps the drives started having issues during the rebuild...

  16. #13

    plexer's Avatar
    Join Date
    Dec 2005
    Location
    Norfolk
    Posts
    13,274
    Thank Post
    614
    Thanked 1,567 Times in 1,407 Posts
    Rep Power
    412
    E200 controller then by the looks of it.

    Ben

  17. #14

    sparkeh's Avatar
    Join Date
    May 2007
    Posts
    6,717
    Thank Post
    1,267
    Thanked 1,639 Times in 1,096 Posts
    Blog Entries
    22
    Rep Power
    504
    Quote Originally Posted by plexer View Post
    E200 controller then by the looks of it.

    Ben
    Yeah just nipped over to the school and it is that one. Won't do RAID 6.

  18. #15

    plexer's Avatar
    Join Date
    Dec 2005
    Location
    Norfolk
    Posts
    13,274
    Thank Post
    614
    Thanked 1,567 Times in 1,407 Posts
    Rep Power
    412
    Nope, the P400 with the battery backup module would do though.

    Ben

SHARE:
+ Post New Thread
Page 1 of 2 12 LastLast

Similar Threads

  1. Replies: 1
    Last Post: 14th December 2010, 09:42 AM
  2. Replies: 2
    Last Post: 23rd June 2010, 01:51 PM
  3. [Video] Another Fail: This Time: Car Wash Fail
    By DaveP in forum Jokes/Interweb Things
    Replies: 1
    Last Post: 7th March 2010, 08:50 PM
  4. [Pics] Fail Blog Post Says It All: Fire Prevention Fail
    By DaveP in forum Jokes/Interweb Things
    Replies: 0
    Last Post: 18th August 2009, 05:57 PM
  5. Recovering data from broken RAID
    By markman in forum Hardware
    Replies: 12
    Last Post: 13th October 2007, 09:24 AM

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •