[libvirt-users] Disk backup for live and offline domains

[Daniel Romero]

have you tried to use direct access to block devices using lvm in your vm's
and then do backups with lvm snapshots?

I'm currently migrating all my "images" vm's to "lvm" vm's because taking
live snapshots is very easy this way. In your case live and offline
snapshot script should be the same.


Regards.
Daniel Romero P.



On Tue, Sep 10, 2019 at 5:38 PM Tim Schumacher <tim at timakro.de> wrote:

> Hi,
>
> I followed the instructions on the wiki
> https://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit
> for a live disk backup. Unfortunately this is not working when the
> domain is offline because the active blockcommit throws
>
> error: Requested operation is not valid: domain is not running
>
> For my use case it should be possible for the domain to shut down while
> the backup is in progress. I'm looking for a way to shorten the backing
> chain after the backup finishes and the domain is offline.
>
> Is there a way to let libvirt decide wether to shorten the backing chain
> using blockcommit or some alternative way which works on offline
> domains?
>
> As I'm writing this I might as well ask about the current state of
> "incremental backups". It seems like dirty bitmaps can keep track of
> which blocks changed and just copy those to the backup. Is there some
> libvirt command-line frontend for that or is it planned for the future?
>
> Thanks.
>
> - Tim
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