On Jan 22 Theodore Tso wrote:
#!/bin/sh
#
# e2croncheck
VG=closure
VOLUME=root
SNAPSIZE=100m
EMAIL=tytso@xxxxxxx
[snip]
Well, this isn't a complete solution, because a lot of people don't
use LVM
Please forgive my late noticing of this. The idea is good, and will work
fine in 99% of cases.
I'd love to snapshot (for rsync as well as fsck) my large filesystems,
which have external journals which in turn are in a different VG.
I suspect that if I were to naïvely run your script, really interesting
things would be likely to happen ;)
So.. I'd love to atomically make two snapshots, but I guess that is Hard
(or would at least require a very coarse lock). I suppose in the meantime
I could "tune2fs -O ^has_journal" the snapshot volume, but I'm too scared
even to do that.
So.. maybe I could request that you either include a Big Fat Disclaimer,
or code based on the following (untested, you can probably do better)?
if (tune2fs -l /dev/${VG}/${VOLUME}|egrep -q "Journal device")
then
echo "Cowardly refusing to play with external journals."
echo "There be dragons!"
exit 1
fi_______________________________________________
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