[ovirt-users] high number of IOPS from ovirt hosts

[Andrea Ghelardi]

Hello Andrea,
I saw that happening on my HE hosts connected to a COMPELLENT SC040 when I was running Ovirt 3.5

All HE hosts were hammering the SAN with 2~4k IOPS each

Upgrading to 4.0.5 solved my case.
Are you able to check if IOPS are generated from a particular host or rather spread among all nodes?

Cheers
AG


-----Original Message-----
From: users-bounces at ovirt.org [mailto:users-bounces at ovirt.org] On Behalf Of Andrea Fagiani
Sent: Friday, February 10, 2017 12:47 PM
To: users at ovirt.org
Subject: [ovirt-users] high number of IOPS from ovirt hosts

Hi,

We've got a 8-host cluster running oVirt 4.1; each host is connected via iscsi to a EQL 4100 storage (2x).
Most of the VMs use barely any IOPS, however on our storage controller we've noticed a constant steam of reads, about 2000 IOPS; any idea what might cause the ovirt hosts to hammer on the storage so much?

Looking at iotop, it seems that systemd-udevd is being activated every few seconds (and its IO% is usually fairly high) so I assume this might be somehow related.

Thanks,
Andrea
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