I am fairly sure LVM does not currently allow this, but what I would
like to do is create one or more snapshots of an origin, work within the
snapshot(s) and then remove the origin.
Understanding a bit about how LVM works, I can understand some of the
problems with this.
* All snapshot volumes would need to be (expanded to the) same
size as the origin.
* In the case of multiple snapshots, snapshots n+1 would need to
have the blocks it shares with the origin copied to it.
Why would I want to do this you might ask?
Let's say I have a Fedora Core 5 system in /dev/vg00/{root,usr,var}. I
want to upgrade with the safety of having somewhere to very quickly and
easily fall back to if it goes horribly wrong. So I make snapshots of
those root, usr, and var volumes, mount them (or reboot from them even)
and try the upgrade. If and when I'm happy with them I have no use for
the original root, usr and var and would like to collapse them, turning
my snaphots of those volumes into bona fide logical volumes, which I can
then take snapshots of at some time in the future.
Thots?
b.
--
My other computer is your Microsoft Windows server.
Brian J. Murrell
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