<div dir="ltr"><div><div class="gmail_extra"><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>></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><div><br></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><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="gmail-HOEnZb"><div class="gmail-h5"><br>
<br>
<br>
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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