<div dir="ltr"><div>Hi,</div><div>a little update:</div><div><br></div><div>The command multipath -ll hung when executed on the host while the problem occur (nothing logged in /var/log/messages or dmesg).</div><div><br></div><div>I tested latency with ioping:</div><div>ioping /dev/6a386652-629d-4045-835b-21d2f5c104aa/metadata</div><div><br></div><div>Usually it return "time=15.6 ms", sometimes return "time=19 s" (yes, seconds)</div><div><br></div><div>Systems are up to date and I tried both path_checker (emc_clariion and directio), without results.</div><div>(<a href="https://access.redhat.com/solutions/139193">https://access.redhat.com/solutions/139193</a>, it refers to the Rev A31 of EMC document; last is A42 and suggest emc_clariion).</div><div><br></div><div>Any idea or suggestion?</div><div><br></div><div>Thanks,</div><div><br></div><div>Stefano</div></div><div class="gmail_extra"><br><div class="gmail_quote">2017-05-08 11:56 GMT+02:00 Yaniv Kaul <span dir="ltr"><<a href="mailto:ykaul@redhat.com" target="_blank">ykaul@redhat.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><br><div class="gmail_extra"><br><div class="gmail_quote"><span class="">On Mon, May 8, 2017 at 11:50 AM, Stefano Bovina <span dir="ltr"><<a href="mailto:bovy89@gmail.com" target="_blank">bovy89@gmail.com</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"><div dir="ltr"><div>Yes,</div><div>this configuration is the one suggested by EMC for EL7.</div></div></blockquote><div><br></div></span><div><a href="https://access.redhat.com/solutions/139193" target="_blank">https://access.redhat.com/<wbr>solutions/139193</a> suggest that for alua, the patch checker needs to be different.</div><div><br></div><div>Anyway, it is very likely that you have storage issues - they need to be resolved first and I believe they have little to do with oVirt at the moment.</div><span class="HOEnZb"><font color="#888888"><div>Y.</div></font></span><span class=""><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 dir="ltr"><div><br></div><div>By the way,</div><div>"The parameters rr_min_io vs. rr_min_io_rq mean the same thing but are used for device-mapper-multipath on differing kernel versions." and rr_min_io_rq default value is 1, rr_min_io default value is 1000, so it should be fine.</div><div><br></div></div><div class="m_1682821682399857149gmail-HOEnZb"><div class="m_1682821682399857149gmail-h5"><div class="gmail_extra"><br><div class="gmail_quote">2017-05-08 9:39 GMT+02:00 Yaniv Kaul <span dir="ltr"><<a href="mailto:ykaul@redhat.com" target="_blank">ykaul@redhat.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><br><div class="gmail_quote">On Sun, May 7, 2017 at 1:27 PM, Stefano Bovina <span dir="ltr"><<a href="mailto:bovy89@gmail.com" target="_blank">bovy89@gmail.com</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">Sense data are 0x0/0x0/0x0</blockquote></div><br>Interesting - first time I'm seeing 0/0/0. The 1st is usually 0x2 (see [1]), and then the rest [2], [3] make sense.</div><div class="gmail_extra"><br></div><div class="gmail_extra">A google search found another user with Clarion with the exact same error[4], so I'm leaning toward misconfiguration of multipathing/clarion here.</div><div class="gmail_extra"><br></div><div class="gmail_extra">Is your multipathing configuration working well for you?</div><div class="gmail_extra">Are you sure it's a EL7 configuration? For example, I believe you should have rr_min_io_rq and not rr_min_io .</div><div class="gmail_extra">Y.</div><div class="gmail_extra"><br></div><div class="gmail_extra">[1] <a href="http://www.t10.org/lists/2status.htm" target="_blank">http://www.t10.org/lists/2<wbr>status.htm</a></div><div class="gmail_extra">[2] <a href="http://www.t10.org/lists/2sensekey.htm" target="_blank">http://www.t10.org/lists/2<wbr>sensekey.htm</a></div><div class="gmail_extra">[3] <a href="http://www.t10.org/lists/asc-num.htm" target="_blank">http://www.t10.org/lists/a<wbr>sc-num.htm</a></div><div class="gmail_extra">[4] <a href="http://www.linuxquestions.org/questions/centos-111/multipath-problems-4175544908/" target="_blank">http://www.linuxquestions.<wbr>org/questions/centos-111/multi<wbr>path-problems-4175544908/</a></div></div>
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