Re: dump/restore corrupted filesystems

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.

Roland
--
R.F.Smith http://www.xs4all.nl/~rsmith/
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