<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif">Hi Mike,</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Which version of OpenStack are you using ? Do the normal migrations work ? </div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">I found a bug that looks like your problem [1]</div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">[1] <a href="https://bugs.launchpad.net/nova/+bug/1715569">https://bugs.launchpad.net/nova/+bug/1715569</a></div><div class="gmail_default" style="font-family:verdana,sans-serif"><br></div><div class="gmail_default" style="font-family:verdana,sans-serif">Cheers,</div><div class="gmail_default" style="font-family:verdana,sans-serif">Sergio</div></div><div class="gmail_extra"><br><div class="gmail_quote">On 2 November 2017 at 08:48, Mike Lowe <span dir="ltr"><<a href="mailto:jomlowe@iu.edu" target="_blank">jomlowe@iu.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">After moving from CentOS 7.3 to 7.4, I’ve had trouble getting live migration to work when a volume is attached. As it turns out when a live migration takes place the libvirt driver rewrites portions of the xml definition for the destination hypervisor and gets it wrong. Here is an example.<br>
<br>
It turns this:<br>
<br>
disk device="disk" type="network"><br>
<driver cache="writeback" name="qemu" type="raw"/><br>
<auth username="cinder"><br>
<secret type="ceph" uuid="1a790a26-dd49-4825-8d16-<wbr>3dd627cf05a9"/><br>
</auth><br>
<source name="cinder-volumes/volume-<wbr>de400476-b68a-45a2-b04f-<wbr>739313f42bef" protocol="rbd"><br>
<host name="172.16.128.101" port="6789"/><br>
<host name="172.16.128.121" port="6789"/><br>
<host name="172.16.128.130" port="6789"/><br>
</source><br>
<target bus="scsi" dev="sdb"/><br>
<serial>de400476-b68a-45a2-<wbr>b04f-739313f42bef</serial><br>
<address bus="0" controller="0" target="0" type="drive" unit="1"/><br>
</disk><br>
<br>
Into this:<br>
<br>
<disk device="disk" type="network"><br>
<driver cache="writeback" name="qemu" type="raw"/><br>
<auth username="cinder"><br>
<secret type="ceph" uuid="1a790a26-dd49-4825-8d16-<wbr>3dd627cf05a9"/><br>
</auth><br>
<source name="cinder-volumes/volume-<wbr>de400476-b68a-45a2-b04f-<wbr>739313f42bef" protocol="rbd"><br>
<host name="172.16.128.101" port="6789"/><br>
<host name="172.16.128.121" port="6789"/><br>
<host name="172.16.128.130" port="6789"/><br>
</source><br>
<target bus="scsi" dev="sdb"/><br>
<serial>de400476-b68a-45a2-<wbr>b04f-739313f42bef</serial><br>
<address controller="0" type="drive"/><br>
</disk><br>
<br>
Note the address change, libvirt will attempt to put this undefined disk at 0:0:0 which conflicts with the root disk and causes the migration to fail. While this may be a libvirt bug I can’t imagine anything good would come from changing the scsi address of your disks mid flight so steps should be taken in nova if rewriting the definition to preserve the address.<br>
<br>
Here is my question, when exactly would you want to change the definition of an attached volume?<br>
<br>
<br>
<br>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><b><font style="color:rgb(102,102,102)" face="arial, helvetica, sans-serif"> Sergio Cuéllar<font style="font-weight:normal" face="arial, helvetica, sans-serif"> │DevOps Engineer</font></font></b></div><div dir="ltr"><font color="#666666"> KIO NETWORKS<br> </font><font face="arial narrow, sans-serif"><span style="color:rgb(102,102,102)">Mexico City Phone (52) 55 8503 2600 ext. 4335</span><br></font></div><div><font face="arial narrow, sans-serif"><span style="color:rgb(102,102,102)"> Mobile: 5544844298</span></font></div><div><font face="arial narrow, sans-serif"><span style="color:rgb(102,102,102)"> <a href="http://www.kionetworks.com" target="_blank">www.kionetworks.com</a></span></font></div><div dir="ltr"><img src="https://s3.amazonaws.com/kiofirmas/firma_a.gif"><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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