Re: BTRFS as image store for KVM?

[Gert Menke <gert@menke.ac>]

On 17.09.2015 at 20:35, Chris Murphy wrote:
> You can use Btrfs in the guest to get at least notification of SDC.
Yes, but I'd rather not depend on all potential guest OSes having btrfs 
or something similar.

> Another way is to put a conventional fs image on e.g. GlusterFS with
> checksumming enabled (and at least distributed+replicated filtering).
This sounds interesting! I'll have a look at this.

> If you do this directly on Btrfs, maybe you can mitigate some of the
> fragmentation issues with bcache or dmcache;
Thanks, I did not know about these. bcache seems to be more or less what 
"zpool add foo cache /dev/ssd" does. Definitely worth a look.

 > and for persistent snapshotting, use qcow2 to do it instead of Btrfs. 
You'd use Btrfs
> snapshots to create a subvolume for doing backups of the images, and
> then get rid of the Btrfs snapshot.
Good idea.

Thanks!