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Thread: Ubuntu 12.04: System freeze; mdadm issue?

  1. #1
    Join Date
    Oct 2006
    Beans
    17

    Question Ubuntu 12.04: System freeze; mdadm issue?

    So I've been having this wonky issue lately; it seems that my new Ubuntu 12.04 install freezes and it may be mdadm related.

    My install is as follows:
    4x750 GB drives, each partitioned the same: ext2 partition, swap partition, ext4 partition; the ext2 and ext4 are then RAID5'd together to have a single ext2 and ext4 partition, mounted on /boot and / respectively.

    This usually works fine and dandy, but randomly freezes the entire system. I then reboot to usually find 2 drives randomly out of the array and have to force them back in and let it resync which is a huge pain.

    I've looked around for a bit and noticed a few others have reported issues with mdadm freezes in 12.04 and many commented that using a new kernel fixed their issue... so I upgraded my kernel to 3.5.4, which did reduce the number of freezes, but they still occur regardless.

    Was curious if anyone happened to know what may be going on and know of any good solutions?

    Thanks!

    Edit:
    Here's my uname -a:
    Code:
    Linux cyrus 3.5.4-030504-generic #201209142010 SMP Sat Sep 15 00:11:50 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
    and my mdadm status:
    Code:
    Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
    md1 : active raid5 sdg2[3] sdf2[2] sde2[1] sdd2[0]
          11002368 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4] [UUUU]
    
    md2 : active raid5 sdg3[3] sdf3[2] sde3[1] sdd3[4]
          2185873920 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4] [UUUU]
          [>....................]  resync =  1.4% (10771688/728624640) finish=154.4min speed=77486K/sec
    
    md0 : active raid5 sdg1[3] sdf1[2] sde1[1] sdd1[0]
          437760 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4] [UUUU]
    
    unused devices: <none>
    Last edited by codemaster; September 25th, 2012 at 07:37 PM.

  2. #2
    Join Date
    Sep 2008
    Location
    Netherlands
    Beans
    369
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Ubuntu 12.04: System freeze; mdadm issue?

    Start by checking S.M.A.R.T. of the drives.

    E.g.
    Code:
    smartctl -a /dev/sd[d-g]
    One more thing:
    It's said to be that it's better to not have /boot at a RAID5 array. RAID1 is preferred.
    Last edited by SaturnusDJ; September 26th, 2012 at 11:54 AM.

  3. #3
    Join Date
    Oct 2006
    Beans
    17

    Re: Ubuntu 12.04: System freeze; mdadm issue?

    I checked the SMART status of each of my disks and that actually helped immensely! It seems the SMART status passed for each one, but commented about overheating. Confused, I took a look inside my case and, sure enough, it looks like the case fan near the drives died out.

    I've placed an order for a new fan and I think this will fix my issue. My belief is that my drives were getting way too hot, shutting down for safety, and thus degrading the array

    Thanks for your help!

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