dump/restore corrupted filesystems
rsmith at xs4all.nl
Mon Apr 16 17:08:31 UTC 2007
On Mon, Apr 16, 2007 at 09:11:48AM -0500, CyberLeo Kitsana wrote:
> I have a 1.2TB UFS2 filesystem with irrecoverable corruption. As such, I
> must move all 500GB or so of data off of it and re-newfs it.
If the corruption is due to hardware failure, your data is probably lost.
Ditto if the corruption is so bad that fsck_ffs can't handle it. You can
e.g. tell fsck_ffs(8) to use a backup superblock, with the -b option.
> Does anybody know whether dump/restore can gracefully handle filesystem
> corruption, or will it happily back up and restore said damage to the
> pristine filesystem?
Dump examines the filesystem to see which files need to be backed up. So
dumping a corrupted FS will probably not produce the desired results. If
it did, we wouldn't need backups.
What you could do is use dd(1) with nc(1) to send a copy of the raw
device data to another machine, and try if you can pry your data from that.
[plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated]
pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725)
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 187 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-questions/attachments/20070416/6efd2e92/attachment.pgp
More information about the freebsd-questions