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if I've understood you, you are using LVM backed local storage on
each compute node. If you run "lvs cinder-volumes" you can see
the disks. I guess you have in your nova.conf image_type=lvm, but
with the volume group lying on the compute node disks.<br>
<br>
One possibility to get shared storage is using one dedicated
storage node with the cinder-volume service configured and put
your instance disks in it. A more simple config is a NFS share for
all your compute nodes. To achieve this I am using a CEPH cluster.<br>
<br>
<br>
<br>
El 11/06/15 a las 14:24, Yngvi Páll Þorfinnsson escribió:<br>
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<p class="MsoNormal"><span style="color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">yes, the disks
are local storage on each compute nodes<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">But I did
configure LVM on each compute node, and did configure this
according to the Juno Install guide:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.5pt;font-family:CartoGothicStd-Book;color:windowtext;mso-fareast-language:IS">„The
service provisions logical volumes on this device<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:CartoGothicStd-Book;color:windowtext;mso-fareast-language:IS">using
the
</span><i><span
style="font-size:10.5pt;font-family:CartoGothicStd-Italic;color:windowtext;mso-fareast-language:IS">LVM
</span></i><span
style="font-size:10.5pt;font-family:CartoGothicStd-Book;color:windowtext;mso-fareast-language:IS">driver
and provides them to instances via
</span><i><span
style="font-size:10.5pt;font-family:CartoGothicStd-Italic;color:windowtext;mso-fareast-language:IS">iSCSI
</span></i><span
style="font-size:10.5pt;font-family:CartoGothicStd-Book;color:windowtext;mso-fareast-language:IS">transport.“</span><span
style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">And volume
groups are configured on each compute node:<o:p></o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:9.0pt;font-family:Courier;color:windowtext;mso-fareast-language:IS">vgcreate
cinder-volumes /dev/sdX</span></b><span
style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><a moz-do-not-send="true"
name="_MailEndCompose"><span style="color:#1F497D">So, I
guess I‘m using a shared storeage ( iscsi ) ?
<o:p></o:p></span></a></p>
<p class="MsoNormal"><span style="color:#1F497D">Are you
referring to LVM configuration and thus a shared storage,
iscsi ?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Yngvi<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="color:windowtext;mso-fareast-language:IS"
lang="EN-US">From:</span></b><span
style="color:windowtext;mso-fareast-language:IS"
lang="EN-US"> Xabier Elkano
[<a class="moz-txt-link-freetext" href="mailto:xelkano@hostinet.com">mailto:xelkano@hostinet.com</a>]
<br>
<b>Sent:</b> 11. júní 2015 12:13<br>
<b>To:</b> Yngvi Páll Þorfinnsson;
<a class="moz-txt-link-abbreviated" href="mailto:openstack@lists.openstack.org">openstack@lists.openstack.org</a><br>
<b>Subject:</b> Re: [Openstack] live migration of
instances<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><br>
Hi,<br>
<br>
do you have shared storage for your instances? If your
instances disks are in a shared storage like iscsi or CEPH
you can do live migrations without problems, otherwise, if
your instances disks are in the compute nodes local storage
( /var/lib/nova/instances), you may need to put this
directory in a NFS share to be able to do live migrations.<br>
<br>
BR,<br>
Xabier<br>
<br>
El 11/06/15 a las 11:56, Yngvi Páll Þorfinnsson escribió:<span
style="font-size:12.0pt;mso-fareast-language:IS"><o:p></o:p></span></p>
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<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Hi<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:IS">I
have installed and configured OpenStack(Juno) environment
on Ubuntu(14.04).</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:IS">We
have currently 1 controller node, 3 network nodes and 4
compute nodes as well as 4 swift nodes.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-fareast-language:IS">I'm
using OpenStack Networking (neutron). </span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I was thinking of doing a „live
migration“ of several instances, if I need to do a OS
upgrade on a compute node.<o:p></o:p></p>
<p class="MsoNormal">For the task of configuring „live
magration“ I‘ve been reading this document:<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><b><span
style="font-size:12.0pt;font-family:CartoGothicStd-Bold">OpenStack
Cloud Administrator Guide</span></b><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:10.0pt;font-family:CartoGothicStd-Book">current
(2015-05-21)</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.5pt;font-family:CartoGothicStd-Book">Copyright
© 2013-2015 OpenStack Foundation Some rights reserved.</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I can quickly see it‘s necessary to add
this line to the nova.conf file ( on computer nodes):<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span
style="font-size:9.0pt;font-family:Courier">live_migration_flag=VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,</span><o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:Courier">VIR_MIGRATE_LIVE,
VIR_MIGRATE_TUNNELLED</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Also, it seems I need to configure a NFS
mount og the dir<o:p></o:p></p>
<p class="MsoNormal">/var/lib/nova/instances<o:p></o:p></p>
<p class="MsoNormal">and thus configures file system access
between all compute nodes.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><b>My question is:</b><o:p></o:p></p>
<p class="MsoNormal">Is this the only way to configure a Live
migration of instances in Openstack ? i.e. configure a nfs
mount of directories?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Best regards<o:p></o:p></p>
<p class="MsoNormal">Yngvi<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif;mso-fareast-language:IS"><br>
<br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
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