2 failed HDDs on a RAID 5

Posted on 2007-10-15
Last Modified: 2010-08-05
I have a RAID 5 array in which 2 HHDs out of 6 failed suddenly. Can I recover my DATA ??
Question by:sevagt
    LVL 12

    Accepted Solution

    probabaly not raid five only has an option to lose one disk at a time.

    If you dont have tape backups then I would recommend runtimes.orgs getbackdata used in conjunction with raid reconstructor.

    Good luck.
    LVL 1

    Expert Comment

    RAID 5: striped set (minimum 3 disks) with distributed parity. Distributed parity requires all but one drive to be present to operate; drive failure requires replacement, but the array is not destroyed by a single drive failure. Upon drive failure, any subsequent reads can be calculated from the distributed parity such that the drive failure is masked from the end user. The array will have data loss in the event of a second drive failure and is vulnerable until the data that was on the failed drive is rebuilt onto a replacement drive.

    Source: Wikipedia

    Try these links...

    Best of luck.
    LVL 9

    Expert Comment

    Ask your local Linux guru to use raidextract --

    If the disks aren't completely dead (just some unreadable sectors), you have good chance of recovery.
    LVL 95

    Expert Comment

    by:Lee W, MVP
    Some dell systems I've worked on can have multiple drives fail - or SEEM to fail.  IT sometimes turns out that a signal on the SCSI bus just knocked the drive(s) off line.  I would suggest trying to force them online and see if they take.  If not, you're only recourse with TWO failed drives is a data recovery service or, what you SHOULD have, especially if the data was important - BACKUPS!
    LVL 12

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