<div dir="ltr">> <span style="color:rgb(0,0,0);font-family:arial,helvetica,sans-serif;font-size:16px">I did find this parameter (only) in /etc/vdsm/vdsm.conf.rpmnew (??)</span><div><font color="#000000" face="arial, helvetica, sans-serif"><span style="font-size:16px"><br></span></font></div><div><font color="#000000" face="arial, helvetica, sans-serif"><span style="font-size:16px">.rpmnew files are telling you that RPM could not update the configuration file automatically during package upgrade, because there was a manual change in it. You can use a tool like rpmconf or just copy it over vdsm.conf if you want the defaults.</span></font></div><div><font color="#000000" face="arial, helvetica, sans-serif"><span style="font-size:16px"><br></span></font></div><div><font color="#000000" face="arial, helvetica, sans-serif"><span style="font-size:16px">See for example:</span></font></div><div><br></div><div><font color="#000000" face="arial, helvetica, sans-serif"><span style="font-size:16px"><a href="https://ask.fedoraproject.org/en/question/25722/what-are-rpmnew-files/">https://ask.fedoraproject.org/en/question/25722/what-are-rpmnew-files/</a></span><br></font></div><div><font color="#000000" face="arial, helvetica, sans-serif"><span style="font-size:16px"><a href="https://www.redhat.com/archives/rhl-list/2003-December/msg04713.html">https://www.redhat.com/archives/rhl-list/2003-December/msg04713.html</a></span><br></font><div class="gmail_extra"><br></div><div class="gmail_extra">Best regards</div><div class="gmail_extra"><br></div><div class="gmail_extra">--</div><div class="gmail_extra">Martin Sivak</div><div class="gmail_extra">SLA / oVirt</div><div class="gmail_extra"><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Apr 19, 2017 at 11:14 AM, Nelson Lameiras <span dir="ltr"><<a href="mailto:nelson.lameiras@lyra-network.com" target="_blank">nelson.lameiras@lyra-network.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><div style="font-family:arial,helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)"><div>hello pavel,<br></div><div><br></div><div>Thanks for you answer.<br></div><div>I did find this parameter (only) in /etc/vdsm/vdsm.conf.rpmnew (??)<br></div><div><br></div><div>Parameter is commented with value 2 so my guess is that it is not used... So this brings a few more questions :<br></div><div><br></div><div>- Since parameter is commented, default value must be used... can we be sure that 2 is default value?<br></div><div>I do found strange that migrations are limited to 2, I have the feeling that more than two are simultaneously being migrated (but I'm maybe wrong), how to be sure?<br></div><span class="gmail-"><div><br></div><div><div>cordialement, regards,</div><div><br></div><table style="margin:0px;table-layout:fixed;border:none;width:345pt;padding:0px" width="460" cellspacing="0" cellpadding="0" border="0"><tbody><tr><td style="margin:0px;font-size:11px;font-family:arial,sans-serif;color:rgb(43,60,122);line-height:16px;width:86.25pt;text-align:left" width="115" valign="top"><a href="https://www.lyra-network.com/" style="border:none;text-decoration:none;width:100%;display:block;clear:both" target="_blank"><img src="cid:b990dfc86651e30fbeaf92463998c47764512adc@zimbra" alt="" width="115" height="94" border="0"></a><br></td><td style="margin:0px;font-size:11px;font-family:arial,sans-serif;color:rgb(43,60,122);line-height:16px;width:258.75pt" width="345" valign="top"><table style="margin:0px;width:258.75pt;table-layout:fixed;border:none" width="345" cellspacing="0" cellpadding="0" border="0"><tbody><tr><td style="font-size:16px;font-family:arial,sans-serif;color:rgb(43,60,122);line-height:18px;font-weight:bold">Nelson LAMEIRAS</td></tr><tr><td style="font-family:arial,sans-serif;color:rgb(43,60,122);font-size:11px;line-height:16px">Ingénieur Systèmes et Réseaux<span style="font-family:arial,sans-serif;color:rgb(51,122,183);font-size:11px"> / Systems and Networks engineer</span></td></tr><tr><td style="line-height:16px;font-family:arial,sans-serif;color:rgb(43,60,122);font-size:11px"><span style="font-family:arial,sans-serif;color:rgb(43,60,122);font-size:11px">Tel: <a href="tel:+33%205%2032%2009%2009%2070" value="+33532090970" target="_blank">+33 5 32 09 09 70</a></span></td></tr><tr><td style="line-height:16px;font-family:arial,sans-serif;color:rgb(43,60,122);font-size:11px"><a href="mailto:nelson.lameiras@lyra-network.com" style="font-size:11px;font-family:arial,sans-serif;line-height:16px;text-decoration:none" target="_blank">nelson.lameiras@lyra-network.<wbr>com</a><br></td></tr><tr><td style="line-height:16px;font-family:arial,sans-serif;color:rgb(43,60,122);font-size:11px"><a href="https://www.lyra-network.com/" style="font-size:11px;font-family:arial,sans-serif;line-height:16px;border:none;text-decoration:none" target="_blank">www.lyra-network.com</a> <a href="https://payzen.eu" style="font-size:11px;font-family:arial,sans-serif;line-height:16px;border:none;text-decoration:none" target="_blank"> | www.payzen.eu</a><br></td></tr></tbody></table></td></tr></tbody></table><table style="margin:0px;table-layout:fixed;border:none;width:345pt" width="460" cellspacing="0" cellpadding="0"><tbody><tr><td style="margin:0px;font-size:11px;font-family:arial,sans-serif;color:rgb(43,60,122);line-height:16px;width:24pt;text-align:left" width="32" valign="top"><a href="https://www.youtube.com/channel/UCrVl1CO_Jlu3KbiRH-tQ_vA" style="border:none;text-decoration:none;margin:0px;float:left;display:inline-block;width:32px" target="_blank"><img src="cid:09fdb929df26c916b74dc42d05368848419a2254@zimbra" alt="" width="32" height="28" border="0"></a><br></td><td style="margin:0px;font-size:11px;font-family:arial,sans-serif;color:rgb(43,60,122);line-height:16px;width:30.75pt;text-align:left" width="41" valign="top"><a href="https://www.linkedin.com/company/lyra-network_2" style="border:none;text-decoration:none;margin:0px;float:left;display:inline-block;width:41px" target="_blank"><img src="cid:8e59ddeced7222fa1aa7d1c0a668df5f02bad7fd@zimbra" width="41" height="28" border="0"></a><br></td><td 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style="background:none 0% 0% repeat scroll rgb(41,59,121);width:100%;height:4px;color:rgb(41,59,121);margin:0px"></td></tr></tbody></table><table style="margin:0px;table-layout:fixed;border:none;width:345pt" width="460" cellspacing="0" cellpadding="0"><tbody><tr><td style="margin:0px;font-size:11px;font-family:arial,sans-serif;color:rgb(43,60,122);line-height:16px;width:30.75pt;text-align:left"><div>Lyra Network, 109 rue de l'innovation, 31670 Labège, FRANCE</div></td></tr></tbody></table><div><br></div></div><div><br></div><hr id="gmail-m_7737958334569706916zwchr"></span><div><b>From: </b>"Pavel Gashev" <<a href="mailto:Pax@acronis.com" target="_blank">Pax@acronis.com</a>><br><b>To: </b><a href="mailto:users@ovirt.org" target="_blank">users@ovirt.org</a>, "nelson lameiras" <<a href="mailto:nelson.lameiras@lyra-network.com" target="_blank">nelson.lameiras@lyra-network.<wbr>com</a>><br><b>Sent: </b>Tuesday, April 18, 2017 7:16:08 PM<br><b>Subject: </b>Re: [ovirt-users] massive simultaneous vms migrations ?<br></div><div><div class="gmail-h5"><div><br></div><div><div>VDSM has the following config option:</div>
<div><br>
</div>
<div># Maximum concurrent outgoing migrations</div>
<div># max_outgoing_migrations = 2</div>
<div><br>
</div>
<div>On Tue, 2017-04-18 at 18:48 +0200, Nelson Lameiras wrote:</div>
<blockquote>
<div style="font-family:arial,helvetica,sans-serif;font-size:12pt;color:rgb(0,0,0)">
<div>hello,<br>
</div>
<div><br>
</div>
<div>When putting a host on "maintenance mode", all vms start migrating to other hosts.
</div>
<div><br>
</div>
<div>We have some hosts that have 60 vms. So this will create a 60 vms migrating simultaneously.<br>
</div>
<div>Some vms are under so much heavy loads that migration fails often (our guess is that massive simultaneous migrations does not help migration convergence) - even with "suspend workload if needed" migraton policy.<br>
</div>
<div><br>
</div>
<div>- Does oVirt really launches 60 simultaneous migrations or is there a queuing system ?<br>
</div>
<div>- If there is a queuing system, is there a way to configure a maximum number of simultaneous migrations ?<br>
</div>
<div><br>
</div>
<div>I did see a "migration bandwidth limit", but this is quite what we are looking for.<br>
</div>
<div><br>
</div>
<div>my setup:<br>
</div>
<div>ovirt-engine +hosted engine 4.1.1<br>
</div>
<div>hosts : centos 7.3 fully updated.<br>
</div>
<div><br>
</div>
<div>
<div>for full context to understand this question : 2 times in the past, when trying to put a host in maintenance, host stopped responding during massive migrations and was fenced by engine. It's still unclear why host stopped responding, but we think that
migrating 60+ vms simultaneously puts a heavy strain on storage ? So we would like to better control migration process in order to better understand what's happening. This scenario is "production only" since our labs do not contain nearly as much vm with such
heavy loads. So rather than trying to reproduce, we are trying to avoid ;)<br>
</div>
<div><br>
</div>
<div>cordialement, regards,</div>
<div><br>
</div>
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Nelson LAMEIRAS</td>
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Ingénieur Systèmes et Réseaux<span style="font-family:arial,sans-serif;color:rgb(51,122,183);font-size:11px"> / Systems and Networks engineer</span></td>
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<span style="font-family:arial,sans-serif;color:rgb(43,60,122);font-size:11px">Tel: <a href="tel:+33%205%2032%2009%2009%2070" value="+33532090970" target="_blank">+33 5 32 09 09 70</a></span></td>
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