Need help on KVM and snapshots

[Karl Auer]

On Sat, 2020-05-09 at 23:28 +1000, Karl Auer wrote:
> I'm trying to get my head around snapshots in KVM - specifically the
> variety created using virsh.

Bad form to answer my own question, but I bit the bullet and spent a
few hours experimenting and have (mostly) figured it out, along with
some excellent clues from the article I mentioned in my original post:

https://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit

The article didn't answer all my questions, but experimentation
answered most of them. Except for the --quiesce" question, so I'm
playing it safe by pausing the VM while taking the external snapshot.
It's a very short pause.

So I now have an effective way to back up a VM running a qcow2
(actually qcow3) virtual disk.

If anyone wants more detail or has more hints, get in touch off-list.

Regards, K.

-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Karl Auer (kauer at biplane.com.au)
http://www.biplane.com.au/kauer
http://twitter.com/kauer389

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