© 2004
Canonical Ltd.
•
Terms of use
•
Data privacy
•
Contact Launchpad Support
•
Blog
•
Careers
•
System status
•
e3ace39
(Get the code!)
I was dropped to busybox on my RAID1 Ubuntu 12.04 AMD64 system uptodate. cat /proc/mdstat reported [U_] on all 3 md devices (/, swap & /home), but I was pretty sure the disk (sdb) was functional.
On reset I pressed ESC to get to the grub menu to select rescue, I could see the message "array degraded press Y to boot degraded" but could not, it automaticcally selected N and drop me again into busybox. From there I could resync the array manually with:
mdadm --add /dev/md0 /dev/sdb1
waited for the md0 to resync and checked again with cat /proc/mdstat that md0 was ok. Repeated the operation for md1 and checked, then md3 and checked again that all MD devices were [UU] good. Reset and the system came up OK!
I then checked extensively disk sdb with SMART that reported no errors and no bad sectors. Did a surface test: ok; a fsck, ok.
So, bottom line, array went out of sync for no apparent reason, and could not start degraded...
Any ideas?