<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Mon, Feb 13, 2017 at 12:32 PM, Andrea Fagiani <span dir="ltr"><<a href="mailto:andrea.fagiani@immobiliare.it" target="_blank">andrea.fagiani@immobiliare.it</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p>Hi Nir,</p>
<p>the amount of IOPS is pretty much constant, attaching the logs
from the last hour or so.</p></div></blockquote><div><br></div><div>Andrea, can you send also logs from ovirt-hosted-engine-ha?</div><div>(I'm not sure about the name of the service or the location of the logs)</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div bgcolor="#FFFFFF" text="#000000"><span class="HOEnZb"><font color="#888888">
<p>Andrea<br>
</p></font></span><div><div class="h5">
<br>
<div class="m_1481480387959180211moz-cite-prefix">On 13/02/2017 10:13, Nir Soffer wrote:<br>
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<div class="gmail_quote">On Mon, Feb 13, 2017 at 11:05 AM,
Andrea Fagiani <span dir="ltr"><<a href="mailto:andrea.fagiani@immobiliare.it" target="_blank">andrea.fagiani@immobiliare.it</a><wbr>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Thanks for the heads
up, I'll take a look at Mark's thread.<br>
We are presenting 2 storage LUNs to a single ovirt
cluster and yes, all hosts are hosted engine hosts.<br>
<br>
Thanks,<br>
Andrea</blockquote>
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</div>
<div>I think we already have hosted engine bug about doing
to many calls to vdsm</div>
<div>that cause reloads of lvm data; this can cause
increased io.</div>
<div><br>
</div>
Can you attach vdsm and hosted engine agent logs showing
the timeframe when
<div>you have lot of iops on the server?</div>
<div><br>
</div>
<div>Nir<br>
</div>
<div> </div>
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On 12/02/2017 18:27, Andrea Ghelardi wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Andrea,<br>
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.<br>
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.<br>
How many storages are you presenting to how many
clusters?<br>
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<br>
Cheers<br>
AG<br>
<br>
<br>
-----Original Message-----<br>
From: Andrea Fagiani [mailto:<a href="mailto:andrea.fagiani@immobiliare.it" target="_blank">andrea.fagiani@immobil<wbr>iare.it</a>]<br>
Sent: Friday, February 10, 2017 5:56 PM<br>
To: Andrea Ghelardi <<a href="mailto:a.ghelardi@iontrading.com" target="_blank">a.ghelardi@iontrading.com</a>>;
<a href="mailto:users@ovirt.org" target="_blank">users@ovirt.org</a><br>
Subject: Re: [ovirt-users] high number of IOPS
from ovirt hosts<br>
<br>
Hi Andrea,<br>
<br>
thanks for the insight; no I wasn't able to
pinpoint the issue to a single host, the load
seems to be evenly spread.<br>
We have another cluster running 4.0.6 on a
compellent as well and we haven't experienced any
similar issues.<br>
<br>
Thanks,<br>
Andrea<br>
<br>
<br>
On 10/02/2017 17:17, Andrea Ghelardi wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
Hello Andrea,<br>
I saw that happening on my HE hosts connected to
a COMPELLENT SC040<br>
when I was running Ovirt 3.5<br>
<br>
All HE hosts were hammering the SAN with 2~4k
IOPS each<br>
<br>
Upgrading to 4.0.5 solved my case.<br>
Are you able to check if IOPS are generated from
a particular host or rather spread among all
nodes?<br>
<br>
Cheers<br>
AG<br>
<br>
<br>
-----Original Message-----<br>
From: <a href="mailto:users-bounces@ovirt.org" target="_blank">users-bounces@ovirt.org</a>
[mailto:<a href="mailto:users-bounces@ovirt.org" target="_blank">users-bounces@ovirt.or<wbr>g</a>]
On<br>
Behalf Of Andrea Fagiani<br>
Sent: Friday, February 10, 2017 12:47 PM<br>
To: <a href="mailto:users@ovirt.org" target="_blank">users@ovirt.org</a><br>
Subject: [ovirt-users] high number of IOPS from
ovirt hosts<br>
<br>
Hi,<br>
<br>
We've got a 8-host cluster running oVirt 4.1;
each host is connected via iscsi to a EQL 4100
storage (2x).<br>
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?<br>
<br>
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.<br>
<br>
Thanks,<br>
Andrea<br>
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