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Hello,

what is the size of the RAM for the flavor of the instance you are trying
to snapshotting ?

thank you

Saverio


2016-08-25 8:48 GMT+02:00 Michael Stang <michael.stang at dhbw-mannheim.de>:

> Hi Konstantin, hi Saverio
>
> thank you for your answers.
>
> I checked the version, these are
>
> libvirt 1.3.1-1ubuntu10.1~cloud0
> qemu  1:2.5+dfsg-5ubuntu10.2~cloud0
>
> at our installation, system is Ubuntu 14.04.
>
>
> I tried also the following from [2]
>
> Command:
>
> nova image-create test "snap_of_test" --poll
> Result: Server snapshotting... 25% completeERROR (NotFound): Image not
> found. (HTTP 404)
>
>
> Then I started trying step by step as in [2] but failed at the first step
> already:
>
> Command:
>
> virsh managedsave instance-00000367
>
> Result:
>
> error: Failed to save domain instance-00000367 state
> error: internal error: unable to execute QEMU command 'migrate': Migration
> disabled: failed to allocate shared memory
>
>
>
> I also checked on the compute nodes the directories:
>
> /var/lib/libvirt/qemu/save/
> /var/lib/nova/instances/snapshots/
>
> there is 257G free space and the instance only has 1GB root disk, so I
> think its not missing space.
>
>
>
> So is this maybe a problem with qemu? How can i enable 'migrate' and why
> is it disabled?
>
>
>
> Thank you for your help.
>
>
>
> Kind regards,
> Michael
>
>
>
>
>
>
>
> > Kostiantyn.Volenbovskyi at swisscom.com hat am 24. August 2016 um 14:51
> geschrieben:
>
> >
> >
> > Hi,
> > extract from [1] ((side note: I couldn't find that in config reference
> for Mitaka) is:
> > "disable_libvirt_livesnapshot = True
> > (BoolOpt) When using libvirt 1.2.2 live snapshots fail intermittently
> under load. This config option provides a mechanism to enable live snapshot
> while this is resolved. See https://bugs.launchpad.net/nova/+bug/1334398"
> >
> > I am not sure if Nova behaves like that in case you have
> disable_libvirt_livesnapshot=True (default in Liberty and Mitaka
> apparently...)
> > In case it is not about that, then I would try to do it manually using
> something like [2] as guideline to see if it succeeds using Libvirt/QEMU
> without Nova.
> >
> > BR,
> > Konstantin
> > [1] http://docs.openstack.org/liberty/config-reference/
> content/list-of-compute-config-options.html
> > [2] https://kashyapc.com/2013/03/11/openstack-nova-image-
> create-under-the-hood/
> >
> >
> >
> >
> >
> > From: Michael Stang [mailto:michael.stang at dhbw-mannheim.de]
> > Sent: Wednesday, August 24, 2016 9:55 AM
> > To: openstack-operators <openstack-operators at lists.openstack.org>
> > Subject: [Openstack-operators] Mitaka live snapshot of instances not
> working
> >
> > Hi all,
> >
> > we have a problem in our new mitaka installation, it seems that it is
> not possible to do a snapshot of a running instance (normal instance
> without an attached volume). When with try to do a snapshot we get a
> success message, but the snapshot is only showed shortly in the imagelist
> with status deleted. I we shutoff the instance and then do a snapshot it is
> working without problems.
> >
> > When we use a cinder volume as root disk instead an ephermal root disk a
> volume snapshot could be made without problem in running state of the
> instance.
> >
> > The same behaviour we have on an other installation of mitaka from our
> colleagues.
> >
> > Is this behaviour normal in Mitaka or ist this maybe a bug? Because in
> Juno we could do snapshots from running instances  without problems.
> >
> >
> > Regards,
> > Michael
> >
> >
> >
> > Michael Stang
> > Laboringenieur, Dipl. Inf. (FH)
> >
> > Duale Hochschule Baden-Württemberg Mannheim
> > Baden-Wuerttemberg Cooperative State University Mannheim
> > ZeMath Zentrum für mathematisch-naturwissenschaftliches Basiswissen
> > Fachbereich Informatik, Fakultät Technik
> > Coblitzallee 1-9
> > 68163 Mannheim
> >
> >
> > michael.stang at dhbw-mannheim.de
> > http://www.dhbw-mannheim.de
> >
> >
> >
> >
> Viele Grüße
>
> Michael Stang
> Laboringenieur, Dipl. Inf. (FH)
>
> Duale Hochschule Baden-Württemberg Mannheim
> Baden-Wuerttemberg Cooperative State University Mannheim
> ZeMath Zentrum für mathematisch-naturwissenschaftliches Basiswissen
> Fachbereich Informatik, Fakultät Technik
> Coblitzallee 1-9
> 68163 Mannheim
>
> Tel.: +49 (0)621 4105 - 1367
> michael.stang at dhbw-mannheim.de
> http://www.dhbw-mannheim.de
>
>
>
>
>
>
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