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

[Andrea Fagiani]

Hi Andrea,

thanks for the insight; no I wasn't able to pinpoint the issue to a 
single host, the load seems to be evenly spread.
We have another cluster running 4.0.6 on a compellent as well and we 
haven't experienced any similar issues.

Thanks,
Andrea


On 10/02/2017 17:17, Andrea Ghelardi wrote:
> 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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