> > What is the suggested way to backup a running kvm instance 
> which uses 
> > several disk images? Currently I simply use a LVM2 snapshot if all 
> > disk images resides on one lvm volume. But what if it uses 
> several lvm 
> > volumes?
> 
> i'd try to suspend KVM, do all LVM snapshots, unsuspend KVM.
> hopefully it would only mean a few seconds of dead time.  can 

I guess that would work, but I want to avoid any downtime. Also
Making more that one LVM snapshot is clumsy.

> several LVM snapshots be created in parallel? lots of testing ahead...

I thought about using 1 lvm volume, but splitting that into slices
somehow, which can then be used as kvm disks - maybe by implementing a
very simple filesystem (block mapper). The problem with this approach is
that adding/deleting a new disk would mean to grow/shrink an lvm
partition, which is slow. 

What do you think? What would be the best way to implement this?

- Dietmar

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