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I've got an Ubuntu server set up that has been running happily for a year or so with no problems to speak of. It's configured in a RAID-1 to keep everything nice and backed up. Yesterday we had a brief power flicker following some lightning. When I went to power everything back up today, I got error: out of disk. Looking around with ls shows me eight volumes. I get various errors trying to ls them:

  • hd0: unknown filesystem
  • hd1: unknown filesystem
  • md/0: unknown filesystem
  • md/1: unknown filesystem
  • hd0,msdos: bad filename
  • hd0,msdos1: unknown filesystem
  • hd1,msdos2: bad filename
  • hd1, msdos1: bad filename

Booting into a GUI with a Live CD shows me two drives that I can't access. The searches I've done so far have suggested that the problem might be a corrupted grub.cfg. 1) How can I fix that, and 2) do I need to take any special steps since I've got a RAID-1 setup?

Thanks!

Tom
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  • Did you check the raid utility to see if you have any damaged disks? – Jakke Jun 17 '14 at 23:16
  • I have not, no. Can I get at that from BIOS? – Tom Jun 17 '14 at 23:17
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    Have you tried these suggestions? – kraxor Jun 17 '14 at 23:21
  • Usually the raid utility comes up after the BIOS messages... depends from system to system to get into it. Sometimes CTRL+I, CTRL+H ... have a look at your boot messages. It will surely say which keys to press to get in the setup. – Jakke Jun 17 '14 at 23:21
  • I remember having the same error; was caused by the fact that grub could not read beyond 128GB on my 160GB-sized drive (a BIOS flaw). Problem disappeared after replacing grub.cfg by an exact copy of the file (probably just dumb luck that the replacement file was located in 'lower' disk blocks). Back then, I didn't know you're not supposed to edit grub.cfg yourself; maybe I should have tried sudo update-grub instead. If it happened today, I'd try @kraxor's suggestion; good chance this 'ATA disk support' repair option will do the same relocation of grub.cfg, but in a more controlled manner. – Ruud Helderman Jun 17 '14 at 23:50
  • Sweet, boot-disk-repair did the trick! Thanks, kraxor. I'll mark this as a duplicate. Cheers all! – Tom Jun 18 '14 at 01:14

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