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I have a configuration of 4 HDD's as Raid1 2 pairs of 2 HDD's. First Raid1 pair is for system, so I just made an 40GB space for swap, and the rest of it for the root, the second pair of Raid1 is for logical use. So, in final I have:

First pair:

  1. Disk:

    • 40GB swap
    • 960GB / ext4 raid

  2. Disk:

    • 40GB swap
    • 960GB / ext4 raid

    Second pair:

  3. Disk:

    • 1.0 TB ext4 raid

  4. Disk:

    • 1.0 TB ext4 raid

After the system installed, at boot up I see a strange error for about 5-6 seconds:

error: no such device: c3b8763c-4623-4fe1-9096-3aadef5cc116
Press any key to continue...

So the question is, what I did wrong?

The output of ls -l /dev/disk/by-uuid is:

total 0
lrwxrwxrwx 1 root root 9 2012-04-24 15:38 c3b8763c-4623-4fe1-9096-    3aadef5cc116 -> ../../md0

The output of fstab:

fstab

The output of mdadm:

mdadm

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When you execute 'ls -l /dev/disk/by-uuid/' do you see a disk with UUID c3b8763c-4623-4fe1-9096-3aadef5cc116? If you go in /etc/fstab, do you see it and if yes for which mount point? – Huygens Apr 24 '12 at 13:09
Ok, I've edited first post with an output of ls -l and fstab :) Thanks – Denis Hoss Apr 24 '12 at 13:19
Perhaps you should ty to see the status of your raid array: 'sudo mdadm -D /dev/md0' In addition during the installation did you follow the instruction given by Ubuntu: help.ubuntu.com/11.10/serverguide/C/advanced-installation.html the 1st chapter is about Software RAID installation. Check the bootable flag hint. – Huygens Apr 24 '12 at 13:45
I checked the flag, I know about it. So the output of mdadm is in first post. Thanks :) – Denis Hoss Apr 24 '12 at 13:49
You might want to check cat /proc/mdstat. Both RAID sets should show up, including rebuilding progress. – jippie Apr 24 '12 at 17:50
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1 Answer

up vote 3 down vote accepted

RAID is resyncing HDD

There are 2 hints:

  1. "State : active, resyncing"
  2. "Rebuild status : 17% complete"

It seems that your system is rebuilding your array (or it did not finished syncing it during installation).

It should be bootable again once the array is finished rebuilding.

For the time being, you could ty to boot in degraded mode at least. You can use 'bootdegraded=true' in grub (press e to edit the boot line and add the option).

Note: I had this as a comment, but I think this is the answer to your question, so I moved it.

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Ok thanks, but I checked degraded mode as Yes at installation time. Ok, I'll try again and will see whats the deal :) thanks – Denis Hoss Apr 24 '12 at 14:23
That's maybe why you can still boot then :) Keep monitoring the Rebuild status. I think /proc/mdadm gives more info on the rebuilding. And once done, it should be all fine (hopefully) – Huygens Apr 24 '12 at 14:26
Ok, I've waited the rebuild and that didn't gave me the success result. So I've decided to reinstall it, and it is ok now, thanks for the help. – Denis Hoss Apr 25 '12 at 12:46

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