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Hardware Thread, Recovering from RAID fail in Technical; Originally Posted by sparkeh HP Smart Array... um can't remember the exact model but its an HP ML350 G5. Also ...
  1. #16
    zag
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    Quote Originally Posted by sparkeh View Post
    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...
    Far more likely its a generic RAID 5 error and the other 2 drives are absolutely fine.

    I had this happen to me a few times and eventually got rid of Raid 5 on all servers other than my file server.

    Not had a failure since (remember the fact that you have a 3 times more likely chance of a drive failing when using raid 5 simply because of the amount of drives required).

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    Ok to move this on a bit:

    After a reboot the HP RAID utility that comes up during boot informed me that the rebuild had failed and asked if I wanted to attempt another rebuild. I said yes and the array rebuilt fine.
    The server is still intermittently crashing with disk/RAID errors.

    So I was wondering if it was a good idea to try replacing the disks with read errors with the new ones from HP one at a time , and attempt to rebuild the array each time?
    Or is better to just to swap the disks and recreate the array and reattach the VHDs as originally planned?

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    Are the VHDs mission critical, i.e. they're constantly in use? If not, my personal preference would be to offload the VHDs and rebuild the entire array by replacing all faulty disks, and see how it goes with that.

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    I had a to make a decision so am trying the swap one disk at a time and rebuild option (I have the VHDs stored in case I need a full recreation of array).

    Interestingly, the original set of disks that came with the server were WD which have all failed with the same kind of error, the replacements HP now ship are Seagate, possibly tells me that they were having issues with these disks?

    edit: quick Google confirms I am not the only one experiencing this.
    Last edited by sparkeh; 13th January 2011 at 11:23 AM.

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    Don't blame you. The current set of spare SAS drives I have are all Seagate. But the older servers (2-3 years) have WD in them. :|

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    Yea the WD drives from a few years back had a definite lifespan issue, replaced 40% of them inside two years, these were desktop drives though.

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