[Cinder][nova] queens backup

Ignazio Cassano ignaziocassano at gmail.com
Wed Jan 23 14:45:54 UTC 2019


Hello Matthew,
our backend is netapp fas8040 via nfs and our instances have often more
than one disk.
Thanks
Ignazio

Il giorno mer 23 gen 2019 alle ore 15:19 Matthew Booth <mbooth at redhat.com>
ha scritto:

> 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
> call
> > > 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
> snapshot
> > 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
> address?
>
> Matt
>
> >
> > Sean
> >
>
>
> --
> Matthew Booth
> Red Hat OpenStack Engineer, Compute DFG
>
> Phone: +442070094448 (UK)
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack-discuss/attachments/20190123/73794d8d/attachment-0001.html>


More information about the openstack-discuss mailing list