Alasdair G Kergon wrote: > On Tue, Sep 16, 2003 at 09:12:15AM +1000, Glen Harris wrote: > >>Is it mandatory to sync the filesystem before taking a snapshot? > > > If you want the snapshot to be consistent: that's what the VFS lock patch > attempts to do automatically whenever you take a snapshot: presumably you > haven't applied that patch? > > Alasdair
Yes, I applied linux-2.4.21-VFS-lock.patch as well as the devmapper patch. The behaviour is reproducable, I just did it again:
lvm:~# mount /dev/vg0/lv0 fs [Several files/dirs exist, but not device-mapper.1.00.05.tgz]
lvm:~# lvcreate -s -L 8m --n snap0 /dev/vg0/lv0 lvm:~# mount /dev/vg0/snap0 snap/0 [Not there yet!]
lvm:~# cp /usr/src/device-mapper.1.00.05.tgz fs lvm:~# lvcreate -s -L 8m --n snap1 /dev/vg0/lv0 lvm:~# mount /dev/vg0/snap1 snap/1 [Does *not* exist in the mounted snapshot filesystem]
lvm:~# sync lvm:~# lvcreate -s -L 8m --n snap2 /dev/vg0/lv0 lvm:~# mount /dev/vg0/snap2 snap/2 [Ahhh! Now it exists in *this* mounted snapshot filesystem!]
Oh, and after the file appears in the final snapshot, it doesn't magically appear in the previous one.
glen.
-- | Nine megs for the secretaries fair, | One disk to rule them all, | | Seven megs for the hackers scarce, | One disk to bind them, | | Five megs for the grads in smoky lairs, | One disk to hold the files | | Three megs for system source; | And in the darkness grind 'em. | ----------------------------------------------------------------------------- | Glen Harris | glen@gbrmpa.gov.au | 07 47500893 | http://www.gbrmpa.gov.au | -----------------------------------------------------------------------------
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