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Thread: Raid 6 Failure During Reshape (Among Other Problems)

  1. #11
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    Re: Raid 6 Failure During Reshape (Among Other Problems)!

    If it keeps up the reshape rate, it will complete in 4ish days. That's still a long time for it to sit there with a potentially bad drive. Can you cancel the reshape and just replace the failing drive and have it rebuild it, then reshape it after?
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  2. #12
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    Re: Raid 6 Failure During Reshape (Among Other Problems)!

    Could you point me to the command to cancel the reshape?

    So the steps would be, mark the failing drive as failed, remove it from the array, replace it physically, format new drive, and start the array again. At that point, you're thinking it should rebuild using the new drive, then continue reshaping to the other 2 drives after that?

  3. #13
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    Re: Raid 6 Failure During Reshape (Among Other Problems)!

    Quote Originally Posted by ryydRnF View Post
    Could you point me to the command to cancel the reshape?

    So the steps would be, mark the failing drive as failed, remove it from the array, replace it physically, format new drive, and start the array again. At that point, you're thinking it should rebuild using the new drive, then continue reshaping to the other 2 drives after that?
    I found something mentioning mdadm --stop, but I don't know if that will stop the entire array or what.

    My idea was to stop the reshape and swap the bad drive out - rebuild/resync the array then reshape it again.

    Does that make sense?
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  4. #14
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    Re: Raid 6 Failure During Reshape (Among Other Problems)!

    Yeah, mdadm --S /dev/md0 will stop the array. I didn't know if there was another specific command to simply stop rebuilding. I will have to mark the drive as failed and remove it from the array before I stop the array though. I'll try this all later or tomorrow morning and see how things work out.

  5. #15
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    Re: Raid 6 Failure During Reshape (Among Other Problems)!

    Good luck!
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  6. #16
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    Re: Raid 6 Failure During Reshape (Among Other Problems)!

    Maybe one of the disks (the failing one?) is slowing all others down. The hdparm program might give an indication:
    Code:
    hdparm -tT /dev/sda
    etc.

    What could help in such a case, is copying all data from the failing disk to a new healthy disk and continue from there (I'm not sure what happens when you cancel the reshape/resync/recover.)
    The right tool to do that is ddrescue.

  7. #17
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    Re: Raid 6 Failure During Reshape (Among Other Problems)!

    Thanks for all of your suggestions so far everyone! Funny thing...I woke up this morning, and the array was just about finished reshaping. Go figure, right? The drive 'sdi' is still failing, but I came back from being out all day and the array is now clean, active, and rebuilding to the other two drives:

    Code:
    Every 2.0s: cat /proc/mdstat                                                                      Sun Sep 29 16:56:42 2013
    
    Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
    md0 : active raid6 sdh1[0] sdk1[11] sdl1[12] sdj1[9] sde1[7] sdb1[6] sdf1[5] sdd1[4] sdg1[3] sdc1[2] sdi1[1]
          8790839424 blocks level 6, 64k chunk, algorithm 2 [11/9] [UUUUUUUU_U_]
          [>....................]  recovery =  4.1% (40822148/976759936) finish=1234.2min speed=12638K/sec
    
    
    unused devices: <none>
    Still won't mount though...

  8. #18
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    Re: Raid 6 Failure During Reshape (Among Other Problems)!

    Wait for it to rebuild and see if it will mount.
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  9. #19
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    Re: Raid 6 Failure During Reshape (Among Other Problems)!

    I've changed out the bad drive to a new good one and it recovered! Hooray.

    Same problem still around though, that the drive won't mount (same error). Thoughts?

  10. #20
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    Re: Raid 6 Failure During Reshape (Among Other Problems)!

    Aw crap. Have you run fsck on the md0 device?
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    Tomorrow's an illusion and yesterday's a dream, today is a solution...

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