>From the log, we can see that the lvextend command took 18 sec, which is
quite long.

60decf0c-6d9a-4c3b-bee6-de9d2ff05e85::DEBUG::2016-04-13
10:52:06,759::lvm::290::Storage.Misc.excCmd::(cmd) /usr/bin/taskset
--cpu-list 0-23 /usr/bin/sudo -n /usr/sbin/lvm lvextend --config ' devices
{ preferred_names = ["^/dev/mapper/"] ignore_suspended_devices=1
write_cache_state=0 disable_after_error_count=3 filter = [
'\''a|/dev/mapper/36000eb3a4f1acbc20000000000000043|'\'', '\''r|.*|'\'' ]
}  global {  locking_type=1  prioritise_write_locks=1  wait_for_locks=1
use_lvmetad=0 }  backup {  retain_min = 50  retain_days = 0 } '
--autobackup n --size 6016m
5de4a000-a9c4-489c-8eee-10368647c413/721d09bc-60e7-4310-9ba2-522d2a4b03d0
(cwd None)
....
60decf0c-6d9a-4c3b-bee6-de9d2ff05e85::DEBUG::2016-04-13
10:52:22,217::lvm::290::Storage.Misc.excCmd::(cmd) SUCCESS: <err> = '
WARNING: lvmetad is running but disabled. Restart lvmetad before enabling
it!\n  WARNING: This metadata update is NOT backed up\n'; <rc> = 0


The watermark can be configured by the following value:

'volume_utilization_percent', '50',
    'Together with volume_utilization_chunk_mb, set the minimal free '
    'space before a thin provisioned block volume is extended. Use '
    'lower values to extend earlier.')

On Thu, Apr 14, 2016 at 11:42 AM, Michal Skrivanek <
michal.skriva...@redhat.com> wrote:

>
> > On 14 Apr 2016, at 09:57, nico...@devels.es wrote:
> >
> > Ok, that makes sense, thanks for the insight both Alex and Fred. I'm
> attaching the VDSM log of the SPM node at the time of the pause. I couldn't
> find anything that would clearly identify the problem, but maybe you'll be
> able to.
>
> In extreme conditions it will happen. When your storage is slow to respond
> to extension request, and when your write rate is very high then it may
> happen, as it is happening to you, that you run out space sooner than the
> extension finishes. You can change the watermark value I guess(right,
> Fred?), but better would be to plan a bit more ahead and either use
> preallocated or create thin and then allocate expected size in advance
> before the operation causing it (typically it only happens during untarring
> gigabytes of data, or huge database dump/restore)
> Even then, the VM should always be automatially resumed once the disk
> space is allocated
>
> Thanks,
> michal
>
> >
> > Thanks.
> >
> > Regards.
> >
> > El 2016-04-13 13:09, Fred Rolland escribió:
> >> Hi,
> >> Yes, just as Alex explained, if the disk has been created as thin
> >> provisioning, the vdsm will extends once a watermark is reached.
> >> Usually it should not get to the state the Vm is paused.
> >> From the log, you can see that the request for extension has been sent
> >> before the VM got to the No Space Error.
> >> Later, we can see the VM resuming.
> >> INFO::2016-04-13
> >> 10:52:04,182::vm::1026::virt.vm::(extendDrivesIfNeeded)
> >> vmId=`f9cd282e-110a-4896-98d3-6d320662744d`::Requesting extension for
> >> volume
> >> ....
> >> INFO::2016-04-13 10:52:29,360::vm::3728::virt.vm::(onIOError)
> >> vmId=`f9cd282e-110a-4896-98d3-6d320662744d`::abnormal vm stop device
> >> virtio-disk0 error enospc
> >> ....
> >> INFO::2016-04-13 10:52:54,317::vm::5084::virt.vm::(_logGuestCpuStatus)
> >> vmId=`f9cd282e-110a-4896-98d3-6d320662744d`::CPU running: onResume
> >> Note that the extension is done on the SPM host, so it would be
> >> interesting to see the vdsm log from the host that was in SPM role at
> >> this timeframe.
> >> Regards,
> >> Fred
> >> On Wed, Apr 13, 2016 at 2:43 PM, Alex Crow <ac...@integrafin.co.uk>
> >> wrote:
> >>> Hi,
> >>> If you have set up VM disks as Thin Provisioned, the VM has to
> >>> pause when the disk image needs to expand. You won't see this on VMs
> >>> with preallocated storage.
> >>> It's not the SAN that's running out of space, it's the VM image
> >>> needing to be expanded incrementally each time.
> >>> Cheers
> >>> Alex
> >>> On 13/04/16 12:04, nico...@devels.es wrote:
> >>> Hi Fred,
> >>> This is an iSCSI storage. I'm attaching the VDSM logs from the host
> >>> where this machine has been running. Should you need any further
> >>> info, don't hesitate to ask.
> >>> Thanks.
> >>> Regards.
> >>> El 2016-04-13 11:54, Fred Rolland escribió:
> >>> Hi,
> >>> What kind of storage do you have ? (ISCSI,FC,NFS...)
> >>> Can you provide the vdsm logs from the host where this VM runs ?
> >>> Thanks,
> >>> Freddy
> >>> On Wed, Apr 13, 2016 at 1:02 PM, <nico...@devels.es> wrote:
> >>> Hi,
> >>> We're running oVirt 3.6.4.1-1. Lately we're seeing a bunch of
> >>> events like these:
> >>> 2016-04-13 10:52:30,735 INFO
> >>> [org.ovirt.engine.core.vdsbroker.VmAnalyzer]
> >>> (DefaultQuartzScheduler_Worker-86) [60dea18f] VM
> >>> 'f9cd282e-110a-4896-98d3-6d320662744d'(vm.domain.com [1] [1]) moved
> >>> from
> >>> 'Up' --> 'Paused'
> >>> 2016-04-13 10:52:30,815 INFO
> >> [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector]
> >>> (DefaultQuartzScheduler_Worker-86) [60dea18f] Correlation ID: null,
> >>> Call Stack: null, Custom Event ID: -1, Message: VM vm.domain.com
> >>> [1] [1]
> >>> has been paused.
> >>> 2016-04-13 10:52:30,898 ERROR
> >> [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector]
> >>> (DefaultQuartzScheduler_Worker-86) [60dea18f] Correlation ID: null,
> >>> Call Stack: null, Custom Event ID: -1, Message: VM vm.domain.com
> >>> [1] [1]
> >>> has been paused due to no Storage space error.
> >>> 2016-04-13 10:52:52,320 WARN
> >>> [org.ovirt.engine.core.vdsbroker.irsbroker.IrsProxyData]
> >>> (org.ovirt.thread.pool-8-thread-38) [] domain
> >>> '5de4a000-a9c4-489c-8eee-10368647c413:iscsi01' in problem. vds:
> >>> 'host6.domain.com [2] [2]'
> >>> 2016-04-13 10:52:55,183 INFO
> >>> [org.ovirt.engine.core.vdsbroker.VmAnalyzer]
> >>> (DefaultQuartzScheduler_Worker-70) [3da0f3d4] VM
> >>> 'f9cd282e-110a-4896-98d3-6d320662744d'(vm.domain.com [1] [1]) moved
> >>> from
> >>> 'Paused' --> 'Up'
> >>> 2016-04-13 10:52:55,318 INFO
> >> [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector]
> >>> (DefaultQuartzScheduler_Worker-70) [3da0f3d4] Correlation ID: null,
> >>> Call Stack: null, Custom Event ID: -1, Message: VM vm.domain.com
> >>> [1] [1]
> >>> has recovered from paused back to up.
> >>> The storage domain is far from being full, though (400+ G available
> >>> right now). Could this be related to this other issue [1]? If not,
> >>> how could I debug what's going on?
> >>> Thanks.
> >>>  [1]: https://www.mail-archive.com/users@ovirt.org/msg32079.html
> >>> [3]
> >>> [3]
> >>> _______________________________________________
> >>> Users mailing list
> >>> Users@ovirt.org
> >>> http://lists.ovirt.org/mailman/listinfo/users [4] [4]
> >>> Links:
> >>> ------
> >>> [1] http://vm.domain.com [1]
> >>> [2] http://host6.domain.com [2]
> >>> [3] https://www.mail-archive.com/users@ovirt.org/msg32079.html [3]
> >>> [4] http://lists.ovirt.org/mailman/listinfo/users [4]
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> >> [3] https://www.mail-archive.com/users@ovirt.org/msg32079.html
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> > <vdsm.log.gz>_______________________________________________
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