Regular cpu load spikes on PVE hosts and VMs

czechsys

Renowned Member
Nov 18, 2015
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Hi,

i am seeing regular cpu load spikes in the monitoring (zabbix, netdata), but can't find why. I have only 2 clusters with different use case, co can't compare with another. Some standalone PVE hosts has some regular spikes too, but it's not so visible so not 100% sure.

Those regular spikes are visible in a lot of the VMs (different types):
1745494981511.png

Even not used VM:
1745495109524.png

The first cluster ~20 min spike interval:
PVE 7.4-19 - all nodes with VMs, nfs and iscsi storage (spike's times are different per node)
1745494480061.png
1745495263183.png

7.4-19 - cluster node (in maintenance) without VMs, nfs and iscsi storage
1745494552440.png
1745495289707.png

The second cluster ~1:30 hod spike interval:
PVE 8.3.5 - node with VMs, ceph storage
1745494579664.png
1745495316893.png

Is there any PVE regular process with such effect? HA, storage, monitoring, etc etc? Or any hint what to check? I hoped netdata will show symptoms, but nothing comparable on graphs.

Thanks.