libvirt users - May 2019 - Re: domains paused without any obvious reason

Hi,

i have a two node HA-Cluster with several domains as resources.
Currently it's running in test mode.
Some domains (all on the same host) stopped running, virsh list shows them as
"paused".
All stopped at the same time (11th of may, 7:00 am), my monitoring system began
to yell.
I don't have any clue why this happened.
virsh domblkerror says for all the domains (5) "no space". The days
before the domains were running fine and i know that all disks inside the domain
should have enough space.
Also the host is not running out of space.
The logs don't say anything sensefully, unfortunately i didn't have a
log for the libvirtd daemon, i just configured that now.
The domains are stopped each day by cron at 10:30 pm for a short moment, a
snapshot is taken, domains are started again, the backing file is copied to a
CIFS server and if that is finished the snapshot is blockcommited into the
backing file.
That's working fine already for several days. This cronjob creates a log and
it's looking fine.
The domains reside in naked Logical Volumes, the respective Volume Group has
enough space.


Bernd


-- 

Bernd Lentes 
Systemadministration 
Institut für Entwicklungsgenetik 
Gebäude 35.34 - Raum 208 
HelmholtzZentrum münchen 
bernd.lentes@helmholtz-muenchen.de 
phone: +49 89 3187 1241 
phone: +49 89 3187 3827 
fax: +49 89 3187 2294 
http://www.helmholtz-muenchen.de/idg 

wer Fehler macht kann etwas lernen 
wer nichts macht kann auch nichts lernen
 

Helmholtz Zentrum Muenchen
Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH)
Ingolstaedter Landstr. 1
85764 Neuherberg
www.helmholtz-muenchen.de
Stellv. Aufsichtsratsvorsitzender: MinDirig. Dr. Manfred Wolter
Geschaeftsfuehrung: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Heinrich Bassler,
Kerstin Guenther
Registergericht: Amtsgericht Muenchen HRB 6466
USt-IdNr: DE 129521671

----- On May 13, 2019, at 3:34 PM, Bernd Lentes
bernd.lentes@helmholtz-muenchen.de wrote:
> Hi,
> 
> i have a two node HA-Cluster with several domains as resources.
> Currently it's running in test mode.
> Some domains (all on the same host) stopped running, virsh list shows them
as
> "paused".
> All stopped at the same time (11th of may, 7:00 am), my monitoring system
began
> to yell.
> I don't have any clue why this happened.
> virsh domblkerror says for all the domains (5) "no space". The
days before the
> domains were running fine and i know that all disks inside the domain
should
> have enough space.
> Also the host is not running out of space.
> The logs don't say anything sensefully, unfortunately i didn't have
a log for
> the libvirtd daemon, i just configured that now.
> The domains are stopped each day by cron at 10:30 pm for a short moment, a
> snapshot is taken, domains are started again, the backing file is copied to
a
> CIFS server and if that is finished the snapshot is blockcommited into the
> backing file.
> That's working fine already for several days. This cronjob creates a
log and
> it's looking fine.
> The domains reside in naked Logical Volumes, the respective Volume Group
has
> enough space.
> 
> 
I resumed one of the guests and it continued without any problem.
The log doesn't indicate any problem, and df -h shows enough space on
all partitions.


Bernd
 

Helmholtz Zentrum Muenchen
Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH)
Ingolstaedter Landstr. 1
85764 Neuherberg
www.helmholtz-muenchen.de
Stellv. Aufsichtsratsvorsitzender: MinDirig. Dr. Manfred Wolter
Geschaeftsfuehrung: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Heinrich Bassler,
Kerstin Guenther
Registergericht: Amtsgericht Muenchen HRB 6466
USt-IdNr: DE 129521671

On Mon, May 13, 2019 at 06:19:05PM +0200, Lentes, Bernd
wrote:
> 
> 
> ----- On May 13, 2019, at 3:34 PM, Bernd Lentes
bernd.lentes@helmholtz-muenchen.de wrote:
> 
> > Hi,
> > 
> > i have a two node HA-Cluster with several domains as resources.
> > Currently it's running in test mode.
> > Some domains (all on the same host) stopped running, virsh list shows
them as
> > "paused".
> > All stopped at the same time (11th of may, 7:00 am), my monitoring
system began
> > to yell.
> > I don't have any clue why this happened.
> > virsh domblkerror says for all the domains (5) "no space".
The days before the
> > domains were running fine and i know that all disks inside the domain
should
> > have enough space.
> > Also the host is not running out of space.
> > The logs don't say anything sensefully, unfortunately i didn't
have a log for
> > the libvirtd daemon, i just configured that now.
> > The domains are stopped each day by cron at 10:30 pm for a short
moment, a
> > snapshot is taken, domains are started again, the backing file is
copied to a
> > CIFS server and if that is finished the snapshot is blockcommited into
the
> > backing file.
> > That's working fine already for several days. This cronjob creates
a log and
> > it's looking fine.
> > The domains reside in naked Logical Volumes, the respective Volume
Group has
> > enough space.
> > 
> > 
> 
> I resumed one of the guests and it continued without any problem.
> The log doesn't indicate any problem, and df -h shows enough space on
> all partitions.
'virsh domstate --reason $GUEST'

will tell you what event caused the guest to pause in the first place.

If you can resume successfully, this indicates the event was a transient
problem.   Given the domblkerror message 'no space' I'm it looks
that
you had a problem running out of disk space temporarily which then
resolved itself.

Regards,
Daniel
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