[ovirt-users] Disk migration eats all CPU, vms running in SPM become unresponsive
Markus Stockhausen
stockhausen at collogia.de
Thu Jul 24 17:02:52 UTC 2014
> users-bounces at ovirt.org [users-bounces at ovirt.org]" im Auftrag von "Federico Alberto Sayd [fsayd at uncu.edu.ar]
> Gesendet: Donnerstag, 24. Juli 2014 18:16
> An: users at ovirt.org
> Betreff: [ovirt-users] Disk migration eats all CPU, vms running in SPM become unresponsive
>
> Hello:
>
> I am experiencing some troubles with ovirt nodes:
>
> When a node is selected as SPM and I move a disk between storage
> domains, it seems that migration process eats all CPU and some VMs
> (running on the SPM) hang, others lose network connectivity. The events
> tab at Ovirt Engine reports the CPU exceeding the defined threshold and
> then reports that VMs in such host (SPM) are not responding.
>
> How can I debug this? Why do the VMs become unresponsive or lost network
> connectivity when the host CPU goes too high?
>
> I have attached a screenshot of the ovirt-engine events, and the
> relevant engine.log
>
>
> My setup:
>
> oVirt Engine Version:
> 3.4.0-1.el6 (Centos 6.5)
> Nodes:
> Centos 6.5
> vdsm-4.14.6-0.el6
> libvirt-0.10.2-29.el6_5.9
> KVM: 0.12.1.2 - 2.415.el6_5.10 (jenkins build)
>
Hi,
just a quick guess:
I would start the analysis by looking if SPM is swapping during the
disk move. We had issues during snapshot deletion. More details at
https://bugzilla.redhat.com/show_bug.cgi?id=1116558
If you encounter BSODs for windows VMs during that operation have
a look at https://bugzilla.redhat.com/show_bug.cgi?id=1110305
Lessons learned so far for us:
- run SPM on the smallest host (with the fewest running VMs)
to mit mitigate side effects of high CPU/disk utilization.
- Clear page cache if nodes run out of free memory.
Markus
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