At least in the case where the snapshot is read-only (LVM1 default, LVM2
by config?), if the snapshot is lost, invalid, not removed from VG prior
to reboot, when LVM comes back up it should see this and immediately
know that it can just vgreduce VG --removemissing for the old snapshot.
In the case of rw (no LVM1, LVM2 default), it should be a user choice
and LVM should prompt the user at boot as to whether to remove this old
snapshot so it can attempt to activate the VG. Unless the user knows
that there were non-backup related lvm mods written during the snapshot
(eg: pvmove) then the user will just answer yes and the system should
boot. This is how LVM should operate in this scenario.
Gerry
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