[linux-lvm] Snapshot of a Snapshot

Karl Wagner kwagner at zetex.com
Fri Feb 29 11:27:32 UTC 2008


I was just wondering if there was a plan to add 'Snapshot of a Snapshot'
functionality to LVM2? If so, is there any timescale on it?

This would be a very useful feature, especially in a Xen environment.

Also, is there an easy way to backup and restore a snapshot? My scenario
is that I am running several Xen DomU's (Virtual machines, 4 of them to
be precise) from snapshots of a base image. However, if one dies (eg the
snapshot overflows, something which should not happen again but just in
case...) and I recreate the snapshot and restore the backup image I
took, it fills the snapshot up. It doesn't seem to check if the data
being written to the snapshot is the same as on the origin volume, just
adds the data to the snapshot anyway. Is there any way round this (apart
from the very slow script I currently have which checks each sector
before writing)?

Cheers in advance


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