Indeed, deploying a few hosts without the hosted engine immediately
resulted in a noticeable decrease in IOPS; thanks a lot for the help,
now we can figure out a way to work around the issue.
Thanks,
Andrea
On 13/02/2017 10:43, Andrea Ghelardi wrote:
Andrea,
Among other advices, I would also suggest you to re-deploy an host without make
it an host-engine node.
It may be worth checking if HE service is responsible of so many IOPS as it was
in my case.
Ciao
AG
-----Original Message-----
From: Andrea Fagiani [mailto:andrea.fagi...@immobiliare.it]
Sent: Monday, February 13, 2017 10:05 AM
To: Andrea Ghelardi <a.ghela...@iontrading.com>; users@ovirt.org
Subject: Re: [ovirt-users] high number of IOPS from ovirt hosts
Thanks for the heads up, I'll take a look at Mark's thread.
We are presenting 2 storage LUNs to a single ovirt cluster and yes, all hosts
are hosted engine hosts.
Thanks,
Andrea
On 12/02/2017 18:27, Andrea Ghelardi wrote:
Andrea,
I don't want to point any fingers but Mark Greenall faced some issues with
Ovirt 4.06/4.1 linked to equallogic as well.
You may want to search posts in this ML with subject " Ovirt 4.0.6 guests 'Not
Responding' " to see if you find any similarities.
How many storages are you presenting to how many clusters?
Also, are your nodes all Hosted Engine Hosts? In my old configuration,
normal hosts read IOPS ranged from 50 to 500 while HE ones peaked even
~3000 Cheers AG
-----Original Message-----
From: Andrea Fagiani [mailto:andrea.fagi...@immobiliare.it]
Sent: Friday, February 10, 2017 5:56 PM
To: Andrea Ghelardi <a.ghela...@iontrading.com>; users@ovirt.org
Subject: Re: [ovirt-users] high number of IOPS from ovirt hosts
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-boun...@ovirt.org [mailto:users-boun...@ovirt.org] On
Behalf Of Andrea Fagiani
Sent: Friday, February 10, 2017 12:47 PM
To: users@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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