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Thread: RAID Healthcheck - anyone care to offer an opinion on results?

  1. #11
    Join Date
    Oct 2009
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    Ubuntu 12.04 Precise Pangolin

    Re: RAID Healthcheck - anyone care to offer an opinion on results?

    Quote Originally Posted by Chris of Arabia View Post
    Well there were no issues with the connections. And I've identified the problem disk, which I've now disconnected and rebooted back into the remaining good disk.

    I've got a couple of spare 500GB disks lying around, but know that they have old Windows installation data sitting on them. I'm assuming this needs to be wiped/formatted before I put them into the Ubuntu box. I just need to understand the best state to get them into before I fit them - anyone care to advise what that would be?
    Was the disk completely dead, or just not being detected?

    The drive will need to be wiped, so you will have to partition and format it like usual before adding it back to the array.
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  2. #12
    Join Date
    Sep 2008
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    The Magic Kingdom
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    Kubuntu 13.10 Saucy Salamander

    Re: RAID Healthcheck - anyone care to offer an opinion on results?

    Looking at the results of this post - http://ubuntuforums.org/showthread.p...8#post12863208 - it's definitely not being detected. I'm not sure whether I can tell whether the disk is actually dead. I'll have a dig into the BIOS and see if appears to be showing up in there as a functioning disk.
    ...knows just enough to be dangerous

  3. #13
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    Kubuntu 13.10 Saucy Salamander

    Re: RAID Healthcheck - anyone care to offer an opinion on results?

    I've checked in the BIOS and it appears to be seeing both disks. The boot sequence also appears to be showing two disks as being good, though it's shooting through a little quick to pick up every nuance being reported there. One thing I did notice whilst in the BIOS, was that the CD/DVD drive was set as the 1st boot device (there's nothing in the drive), so I changed that to be one of the two HDDs (SATA: PS-WDC WD3). Interestingly, this time it booted, it ended up dropping me into a grub rescue> prompt. Going back into BIOS, I swapped the 1st boot device over to the other HDD (SATA: SS-WDC WD3), but the boot sequence went nowhere and just left me with a blank screen.

    I've just now reversed the HDD boot sequence back, and am now left with the message Read Error_ on the screen. Rebooted again, and this time, I'm back to the grub rescue> prompt

    Edit: Actually, what it says on the screen is as follows...

    error: attempt to read or write outside of disk 'hd0' .
    Entering rescue mode...
    grub rescue>
    Last edited by Chris of Arabia; December 3rd, 2013 at 08:54 PM.
    ...knows just enough to be dangerous

  4. #14
    Join Date
    Sep 2008
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    Kubuntu 13.10 Saucy Salamander

    Re: RAID Healthcheck - anyone care to offer an opinion on results?

    In the end, I put a couple of different disks in it and did a scratch rebuild. Looking at a repeat of the first couple of checks I did, all now seems well and I think we can consider this closed.

    Last login: Mon Dec 16 19:17:21 2013 from eeyore2.local
    chris@PIGLET2:~$ sudo cat /proc/mdstat
    [sudo] password for chris:
    Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
    md0 : active raid1 sdb1[1] sda1[0]
    16006016 blocks super 1.2 [2/2] [UU]
    md1 : active raid1 sdb2[1] sda2[0]
    472238912 blocks super 1.2 [2/2] [UU]
    unused devices: <none>
    chris@PIGLET2:~$ sudo mdadm --detail /dev/md1
    /dev/md1:
    Version : 1.2
    Creation Time : Sat Dec 14 22:36:56 2013
    Raid Level : raid1
    Array Size : 472238912 (450.36 GiB 483.57 GB)
    Used Dev Size : 472238912 (450.36 GiB 483.57 GB)
    Raid Devices : 2
    Total Devices : 2
    Persistence : Superblock is persistent
    Update Time : Mon Dec 16 21:51:25 2013
    State : clean
    Active Devices : 2
    Working Devices : 2
    Failed Devices : 0
    Spare Devices : 0
    Name : PIGLET2:1 (local to host PIGLET2)
    UUID : 6c66e0b5:0ba8efd6:d4249152:3f3512d0
    Events : 44
    Number Major Minor RaidDevice State
    0 8 2 0 active sync /dev/sda2
    1 8 18 1 active sync /dev/sdb2
    ...knows just enough to be dangerous

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