removing an origin from under snapshots
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.
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My other computer is your Microsoft Windows server. Brian J. Murrell