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Thread: [SOLVED] Getting RAID back after fresh install (7.10 -> 8.04)

  1. #1
    Join Date
    Aug 2007
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    Question [SOLVED] Getting RAID back after fresh install (7.10 -> 8.04)

    Hi folks

    A few days ago I installed 7.10 from a CD I'd burnt a while back. I built a nicely working RAID-1 with this guide -- http://bfish.xaedalus.net/?p=188.
    I then messed things up a bit with Compiz etc. and decided to do a completely fresh install. I did that, and then did a live update to 8.04.

    OK, now I want to get my RAID back and make sure it's working / synced. I added this line to my fstab, and commented the two below it which were in by default from the fresh install:

    Then mounted md0, and it appears to be working fine, at least, I can see files and folders, open text files etc. and it's working smoothly so I suspect no problems.

    However when I go into gparted I get the little caution icon on both:
    --the two drives that constitute the array (I think this is normal though once you make a RAID with them, i.e. they no longer have valid individual partition tables(?)
    --the RAID itself, md0.

    It's the second one I'm most concerned about. When I get properties on /dev/md0 in gparted it says
    Code:
    warning:
    e2label: No such file or directory while trying to open /dev/md0p1
    Couldn't find valid filesystem superblock.
    
    Couldn't find valid filesystem superblock.
    .
    .
    .
    Unable to read the contents of this filesystem!
    Because of this some operations may be unavailable.
    Any ideas? Am I good to go? Did I just miss something when trying to resurrect the array?

    TIA,

    -Nick
    Last edited by NickZA; August 7th, 2008 at 08:47 AM. Reason: didnt finish first time
    "What does the billboard say? Come and play, come and play; forget about the movement."

    -RATM

  2. #2
    Join Date
    Feb 2008
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    US
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    2,782
    Distro
    Ubuntu 8.04 Hardy Heron

    Re: Getting RAID back after fresh install (7.10 -> 8.04)

    I think you forgot a link. which guide did you use originally?

    Also try this command:
    Code:
    sudo apt-get install mdadm
    sudo mdadm --scan --assemble
    Desktop: Q6600 OC: 343 x 9, 4 GB RAM, 8600 GTS Twinview (22",17"), 1.5 TB RAID 5
    Laptop: Lenovo T61 T7300 @ 2 GHz, 2GB RAM, Nvidia 140M Quadro, 160 GB harddrive
    Remember to mark posts as [SOLVED] when your problem is resolved

  3. #3
    Join Date
    Aug 2007
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    Re: Getting RAID back after fresh install (7.10 -> 8.04)

    Oops, that was http://bfish.xaedalus.net/?p=188

    Thanks for pointing that out!

    I tried
    Code:
    sudo mdadm --scan --assemble
    ..Before I had refreshed my fstab with the md0 line as described above. It came back with complaints, although I can't recall what they were.

    But I sort of assumed one has to put the fstab lines in again before one can do anything else(?), so maybe if I'd done this:

    1. change /etc/fstab
    2. sudo mdadm --scan --assemble
    3. mount the array

    instead of only steps 1 and 3 (as I have done), it might have worked better. Perhaps I can try when I get home. However I already issued a write operation on the disk last night so if anything is going to be messed up it will be after that. (Doesn't seem to be though but I'm not sure how to check thoroughly.)
    "What does the billboard say? Come and play, come and play; forget about the movement."

    -RATM

  4. #4
    Join Date
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    Re: Getting RAID back after fresh install (7.10 -> 8.04)

    bump! Can anyone tell me what those errors mean and if they are anything to be concerned about?
    "What does the billboard say? Come and play, come and play; forget about the movement."

    -RATM

  5. #5
    Join Date
    Aug 2007
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    Talking Re: Getting RAID back after fresh install (7.10 -> 8.04)

    SOLVED: The caution icon and it's associated warnings appear to always display in gparted when you have created a functional soft RAID using mdadm.
    So nothing to worry about. (I tested by deleting the old array completely and creating a new one.)
    "What does the billboard say? Come and play, come and play; forget about the movement."

    -RATM

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