[linux-lvm] Offline fsck (checking snapshots)

[Bryan Kadzban]

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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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