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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>
    <p>Andrea<br>
    </p>
    <br>
    <div class="moz-cite-prefix">On 13/02/2017 10:13, Nir Soffer wrote:<br>
    </div>
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cite="mid:CAMRbyys8KXVqdCjj233+r6P5wCwveVBKRDKe+qg0UpGKenoLOw@mail.gmail.com"
      type="cite">
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            <div class="gmail_quote">On Mon, Feb 13, 2017 at 11:05 AM,
              Andrea Fagiani <span dir="ltr">&lt;<a
                  moz-do-not-send="true"
                  href="mailto:andrea.fagiani@immobiliare.it"
                  target="_blank">andrea.fagiani@immobiliare.it</a>&gt;</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>
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              <div>Nir<br>
              </div>
              <div> </div>
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                  <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
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                      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
                        moz-do-not-send="true"
                        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 &lt;<a moz-do-not-send="true"
                        href="mailto:a.ghelardi@iontrading.com"
                        target="_blank">a.ghelardi@iontrading.com</a>&gt;;
                      <a moz-do-not-send="true"
                        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 moz-do-not-send="true"
                          href="mailto:users-bounces@ovirt.org"
                          target="_blank">users-bounces@ovirt.org</a>
                        [mailto:<a moz-do-not-send="true"
                          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 moz-do-not-send="true"
                          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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