Superblock missing, FS corruption after power outage
adilger at sun.com
Tue Apr 21 12:01:30 UTC 2009
On Apr 21, 2009 19:17 +1000, Robert Davidson wrote:
> It is possible in this case that a fair chunk of data could have been lost as
> the RAID card has a 256mb cache with no battery backup for cached data,
At this point, all bets are off - ext3+jbd expects when the disk reports
that data is safe on disk that it really is safe.
> seems somewhat extreme that the superblock went missing (according to mount
> the filesystem didn't exist, according to fsck.ext3 it had to use a backup
> superblock), and that a whole directory disappeared and didn't end up in
Well, if you lost 256MB at the start of the filesystem then that could easily
contain the whole directory, which might only be a few blocks in size.
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
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