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> users-bounces@ovirt.org [users-bounces@ovirt.org]" im Auftrag von &q=
uot;Federico Alberto Sayd [fsayd@uncu.edu.ar]=0A=
> Gesendet: Donnerstag, 24. Juli 2014 18:16=0A=
> An: users@ovirt.org=0A=
> Betreff: [ovirt-users] Disk migration eats all CPU,     vms running in SP=
M become unresponsive=0A=
> =0A=
> Hello:=0A=
> =0A=
> I am experiencing some troubles with ovirt nodes:=0A=
> =0A=
> When a node is selected as SPM and I move a disk between storage=0A=
> domains, it seems that migration process eats all CPU and some VMs=0A=
> (running on the SPM) hang, others lose network connectivity. The events=
=0A=
> tab at Ovirt Engine reports the CPU exceeding the defined threshold and=
=0A=
> then reports that VMs in such host (SPM) are not responding.=0A=
> =0A=
> How can I debug this? Why do the VMs become unresponsive or lost network=
=0A=
> connectivity when the host CPU goes too high?=0A=
> =0A=
> I have attached a screenshot of the ovirt-engine events, and the=0A=
> relevant engine.log=0A=
> =0A=
> =0A=
> My setup:=0A=
> =0A=
> oVirt Engine Version:=0A=
>      3.4.0-1.el6 (Centos 6.5)=0A=
> Nodes:=0A=
>      Centos 6.5=0A=
>      vdsm-4.14.6-0.el6=0A=
>      libvirt-0.10.2-29.el6_5.9=0A=
>      KVM: 0.12.1.2 - 2.415.el6_5.10 (jenkins build)=0A=
> =0A=
=0A=
Hi, =0A=
=0A=
just a quick guess:=0A=
=0A=
I would start the analysis by looking if SPM is swapping during the =0A=
disk move. We had issues during snapshot deletion. More details at =0A=
https://bugzilla.redhat.com/show_bug.cgi?id=3D1116558=0A=
=0A=
If you encounter BSODs for windows VMs during that operation have =0A=
a look at https://bugzilla.redhat.com/show_bug.cgi?id=3D1110305=0A=
=0A=
Lessons learned so far for us:=0A=
=0A=
- run SPM on the smallest host (with the fewest running VMs)=0A=
to  mit mitigate side effects of high CPU/disk utilization.=0A=
=0A=
- Clear page cache if nodes run out of free memory.=0A=
=0A=
Markus=0A=
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