[Cinder][nova] queens backup
ignaziocassano at gmail.com
Wed Jan 23 14:45:54 UTC 2019
our backend is netapp fas8040 via nfs and our instances have often more
than one disk.
Il giorno mer 23 gen 2019 alle ore 15:19 Matthew Booth <mbooth at redhat.com>
> On Tue, 22 Jan 2019 at 18:51, Sean McGinnis <sean.mcginnis at gmx.com> wrote:
> > On Tue, Jan 22, 2019 at 07:04:05PM +0100, Ignazio Cassano wrote:
> > > Hi All,
> > > Please, I' d like to know if cinder backup and/or cinder snapshot
> > > qemu guest agent for fsfreezing.
> > > If Yes, does it freeze file systems in the volume?
> > > Regards
> > > Ignazio
> > Unfortunately no, initiating a snapshot or backup from Cinder does not
> call out
> > to Nova to do any guest quiescing. There would need to be something else
> > coordinating the calls between the guest OS and initiating the Cinder
> > to do that.
> Although it wouldn't help making a consistent snapshot of an instance
> with multiple disks, for a single disk it shouldn't matter if the
> guest is quiesced as long as the backend can make an instantaneous
> snapshot. I'm pretty sure many (most?) backends would support that;
> certainly plain old LVM does. Does cinder use this functionality where
> it's available, and would that solve the problem you're trying to
> > Sean
> Matthew Booth
> Red Hat OpenStack Engineer, Compute DFG
> Phone: +442070094448 (UK)
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the openstack-discuss