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users-bounces(a)ovirt.org [users-bounces(a)ovirt.org]" im
Auftrag von &q=
uot;Federico Alberto Sayd [fsayd(a)uncu.edu.ar]=0A=
Gesendet: Donnerstag, 24. Juli 2014 18:16=0A=
An: users(a)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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