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xen-users
Re: [Xen-users] A simple backup
> > IMHO, even the best commercial SAN-based backup solution uses that
> > assumption, so for practical purposes, atomic backup for domU's storage
> > should be sufficient.
>
> So are local logical volume snapshots atomic? I could see a network
> block device not being quite atomic with lv snapshot, but it seems that
> local storage on lv should be atomic. I keep reading conflicting data
> about weather it is or is not atomic.
Local LVM snapshots are atomic, I think. It's just that atomicity of a
snapshot is not sufficient to guarantee that the snapshot is *consistent*,
due to caching in the guest. Yanking the power cord out of the machine
creates a consistent snapshot of its current disk state (by atomically
preventing the machine updating its disk ;-)) but that will also need a
filesystem recovery before the FS is actually readable.
Cheers,
Mark
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