NAS540 First one degraded disk, now volume gone.

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  • Mijzelf
    Mijzelf Posts: 2,044
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    That looks sane. I suppose you removed some USB disks?

    You can try to run e2fsck, to see if it recognizes something. e2fsck is the filesystem repair utility for ext filesystems. On the NAS it's renamed. Let's first run it dry, as in, don't make any changes:

    e2fsck.new -n /dev/md2



  • Kuno
    Kuno Posts: 24
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    Yes, I have removed the USB attached drives.
    Here is the output:
    e2fsck.new -n /dev/md2
    sh: e2fsck.new: not found

  • Mijzelf
    Mijzelf Posts: 2,044
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    Ah, sorry. That .new is only on the NSA series. On a 5xx it's just e2fsck.
  • Kuno
    Kuno Posts: 24
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    Here is the last of the output. The first of it was I not able to copy fra PuTTy.
  • Mijzelf
    Mijzelf Posts: 2,044
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    Right. The bad news is that there are some severe errors, far more than I hoped for. The good news is that e2fsck still recognizes the filesystem, and the errors are not as severe as they could have been.

    I'm not sure which I should recommend now. You can try to actually repair the damage (command 'e2fsck -y /dev/md2') but the problem is that an attempt to repair can make things worse. I will not pretend I'm a filesystem specialist, and I really don't know how bad the situation is. It's clear that you didn't read alone, in that half year.
    In my experience an error list like this might be repairable, but you'll keep damaged files. When this was an OS disk, you probably can't boot from it after repairing. In any case I'd copy away user data, after repairing, and put a new filesystem on it, as I wouldn't trust the filesystem anymore. But I've never tried to repair a filesystem where 33% of the surface is out of sync for half a year.

    So if this data is valuable, and you can afford it, you should go to a professional data recovering business, with all 4 disks (the dead disk might be revive-able, in which case the out of sync problem is gone), and an accurate description of what happened and what you've done. That might cost between €500 and €5000, maybe no cure no pay.

    If the data is not that valuable, or you simply can't afford it, you can try to repair. After all the current situation is that everything is gone, so any change can only be for good.
  • Kuno
    Kuno Posts: 24
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    Thanks, I will try a repair. Do you know how to turn off the beeping? Wifei is not impressed by the sound ;-) 
  • Mijzelf
    Mijzelf Posts: 2,044
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    buzzerc -s



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