From owner-freebsd-questions  Wed Jun 20 10:24:59 2001
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Date: Wed, 20 Jun 2001 21:24:52 +0400 (MSD)
From: Alexey Koptsevich <kopts@astro.ioffe.rssi.ru>
To: questions@freebsd.org
Subject: reviving vinum striped disc
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Hello,

Bad block occurred on one of two subdisks of a vinum volume (which
consists of one striped plex). This subdisk is now marked 'stale' in vinum
config. Before reboot and bad blocks reassignment only a part of disc
hierarchy was out of the operation. Based on that, as well as on that only
one block turned out to be bad I hope there is a chance to restore
significant part of the information. The filesystem is now marked dirty
and, since fsck gives errors immediately after starting, I afraid fsck may
corrupt the filesystem completely if I reply 'yes' to its
questions. Fsck output starts with

** /dev/vinum/data
** Last Mounted on /data
** Phase 1 - Check Blocks and Sizes
CANNOT READ: BLK 512

Thus I have three questions:
- how can I forcibly mark filesystem clean (in order to mount it read-only
and then backup its uncorrupted part somewhere)?
- can I run fsck in 'dummy' mode in order to evaluate is it possible to
restore the filesystem without making actual corrections?
- can I do something which gives higher possibility to restore the data 
than two things I mentioned above?

I run FreeBSD 4.2.

Thanks a lot,
Alex


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