[linux-lvm] Offline fsck (checking snapshots)

David Coulson david at davidcoulson.net
Sat May 10 01:07:44 UTC 2008

I've been playing with this script today - Is there a more current 
version, or someone who maintains it? There are a bunch of things that 
seem to be broken that I ended up cleaning up on my own (e.g. it 
calculates the snapshot size in M, then creates it in extents...).

I imagine there are other users who are frustrated with it, as it does 
not run cleanly as it is.


Bryan Kadzban wrote:
> Hash: RIPEMD160
> There was some discussion on the ext3-users list a few months ago, about
> how e2fsck took a long time to run, and it was getting forced because it
> keeps track of a couple of counters that can force it (the counters are
> days since the last full fsck, and mounts since the last full fsck).
> (The thread starts at [1], the script development started at [2], and
> the most recent version is at [3].  The one extra thing I've added is
> skipping ext2/3 FSes that have an external journal.)
> The suggestion was made that if the user is using LVM, a temporary
> snapshot could be taken, and then fsck could be run on that.  If it
> succeeds, then it's possible to set the last-fsck-time and mount-count
> while the real FS is mounted.
> I've gotten a script that I think is reasonable, that handles this.
> With some help from others, it now works with XFS as well as ext2/3, and
> it's supposed to also work with JFS.  Since it requires LVM, I think it
> might make sense to put something like it into the LVM userspace tools.
> (There is one issue: it also requires blkid and logsave from e2fsprogs.
> I could work around the requirement for logsave (using tee -a), but
> blkid would be harder.)
> The idea behind the script is, you run it at night from cron; it will
> check each LV on the system and mail a user if there are any problems.
> It also logs to syslog.
> I've attached the script and its configuration file to this message.
> Comments?
> [1] https://www.redhat.com/archives/ext3-users/2008-January/msg00027.html
> [2] https://www.redhat.com/archives/ext3-users/2008-January/msg00032.html
> [3]
> https://www.redhat.com/archives/ext3-users/2008-February/msg00004.html
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