<div dir="ltr"><div><div>The multipath report does not have any effects on stability/performance.<br></div>It is used for creating events to the user in the engine, in order to detect earlier issues in their storage. [1]<br><br></div>In your case, you would have an wrong alarm in the Engine that would not be cleared until next Vdsm restart.<br><div><div><div><br><br>[1] <a href="https://ovirt.org/develop/release-management/features/storage/multipath-events/#event-reporting">https://ovirt.org/develop/release-management/features/storage/multipath-events/#event-reporting</a><br></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Mar 11, 2018 at 2:23 PM, Bruckner, Simone <span dir="ltr"><<a href="mailto:simone.bruckner@fabasoft.com" target="_blank">simone.bruckner@fabasoft.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="blue" vlink="purple" lang="DE">
<div class="m_-5323323430323147789WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Hi Fred,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-GB"> thank you for the explanation. I restarted VDSM and will monitor the behaviour.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-GB"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-GB">Does that faulty multipath report have any side effects on stability and performance?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="EN-GB"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="DE-AT">All the best,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif" lang="DE-AT">Oliver<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Von:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Fred Rolland [mailto:<a href="mailto:frolland@redhat.com" target="_blank">frolland@redhat.com</a>]
<br>
<b>Gesendet:</b> Sonntag, 11. März 2018 11:23<br>
<b>An:</b> Bruckner, Simone <<a href="mailto:simone.bruckner@fabasoft.com" target="_blank">simone.bruckner@fabasoft.com</a>><br>
<b>Cc:</b> <a href="mailto:users@ovirt.org" target="_blank">users@ovirt.org</a><br>
<b>Betreff:</b> Re: [ovirt-users] Faulty multipath only cleared with VDSM restart<u></u><u></u></span></p><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div>
<div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">Hi<span lang="EN-GB"> Simone</span>,<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">The multipath health is built on VDSM start from the current multipath state, and after that it is maintained based on events sent by udev.<u></u><u></u></p>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt">You can read about the implementation details in [1].<u></u><u></u></p>
</div>
<p class="MsoNormal">It seems that in your scenario, either udev did not sent the needed clearing events or that Vdsm mishandled them.<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">Therefore only restart of the Vdsm will clear the report.<u></u><u></u></p>
</div>
<p class="MsoNormal">In order to be able to debug the issue, we will need Vdsm logs with debug level (on storage log) when the issue is happening.<u></u><u></u></p>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div>
<p class="MsoNormal">Thanks,<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal">Fred<u></u><u></u></p>
</div>
<div>
<p class="MsoNormal"><br>
[1] <a href="https://ovirt.org/develop/release-management/features/storage/multipath-events/" target="_blank">
https://ovirt.org/develop/<wbr>release-management/features/<wbr>storage/multipath-events/</a><u></u><u></u></p>
</div>
</div>
</div>
</div>
<div>
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<p class="MsoNormal">On Fri, Mar 9, 2018 at 1:07 PM, Bruckner, Simone <<a href="mailto:simone.bruckner@fabasoft.com" target="_blank">simone.bruckner@fabasoft.com</a>> wrote:<u></u><u></u></p>
<blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class="MsoNormal">Hi,<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> after rebooting SAN switches we see faulty multipath entries in VDSM.</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">Running vdsm-client Host getStats shows multipathHealth entries</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-GB">"multipathHealth": {</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-GB"> "<wbr>3600601603cc04500a2f9cd597080d<wbr>b0e": {</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-GB"> "valid_paths": 2,</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-GB"> "failed_paths": [</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-GB"> "sdcl",</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-GB"> "sdde"</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-GB"> ]</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-GB"> },</span><u></u><u></u></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-GB"> …</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">Running multipath –ll does not show any errors.</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">After restarting VSDM, the multipathHealth entires from vdsm-client are empty again.</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">Is the a way to clear those multipathHealth entires without restarting VDSM?</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">Thank you and all the best,</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB">Simone</span><u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-GB"> </span><u></u><u></u></p>
</div>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
______________________________<wbr>_________________<br>
Users mailing list<br>
<a href="mailto:Users@ovirt.org" target="_blank">Users@ovirt.org</a><br>
<a href="http://lists.ovirt.org/mailman/listinfo/users" target="_blank">http://lists.ovirt.org/<wbr>mailman/listinfo/users</a><u></u><u></u></p>
</blockquote>
</div>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
</div></div></div>
</div>
</blockquote></div><br></div>