<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hello Robert,<div><br></div><div>Thank you very much for the answer.</div><div><br></div><div>Hmm, I just love the way drbd is giving me LVM partitions to my virtual guests, but if it's not possible in a three node setup I might need to think different.</div><div>This is a development cluster, otherwise I would go for a real SAN solution anyway.</div><div><br></div><div>Thanks a lot<br><div apple-content-edited="true">
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div>----------------------------------</div><div>Bjorn Enroth</div><div><a href="mailto:bjorn.enroth@comnia.se">bjorn.enroth@comnia.se</a></div><div>+46 8 53338400 (direct)</div><div>+46 70 3118400 (cell)</div><div><br></div><div>Comnia Internet AB</div><div><a href="http://www.comnia.se">http://www.comnia.se</a></div><div>+46 8 55002540 (phone)</div><div>+46 8 55002541 (fax)</div></span>
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<br><div><div>16 apr 2012 kl. 09:29 skrev <a href="mailto:Robert.Koeppl@knapp.com">Robert.Koeppl@knapp.com</a>:</div><br class="Apple-interchange-newline"><blockquote type="cite">
<br><font size="2" face="sans-serif">IIRC three active nodes are not supported
by DRBD.</font>
<br><font size="2" face="sans-serif">You will have to resort to a shared
storage solution. I am not entirely sure if a NFS-Server managed by Pacemaker
with a backing DRBD would be fast enough and how well KVM handles the outage
in case of a failover of the Cluster.</font>
<br><font size="2" face="sans-serif">In this Environment you would have two
dedicated servers for the storage-cluster and combine them with a bunch
of "pizzaboxes" that run the Virtual Machines in another pacemaker
cluster. As a decent storage backend (bunch of 15k SAS-drives, Raid-controller+BBU)
easily costs much more than those small servers you might even get away
with about the same cost - depending on the number of disks you had planned
for your cluster.<br>
</font><font size="3" color="#5f5f5f">Mit freundlichen Grüßen / Best Regards<br>
<br>
Robert Köppl<br>
<br>
Customer Support & Projects <br>
Teamleader IT Support<br>
<b><br>
KNAPP Systemintegration GmbH</b><br>
Waltenbachstraße 9<br>
8700 Leoben, Austria <br>
Phone: +43 3842 805-322<br>
Fax: +43 3842 82930-500<br>
<a href="mailto:robert.koeppl@knapp.com">robert.koeppl@knapp.com</a> <br>
<a href="http://www.KNAPP.com">www.KNAPP.com</a> <br>
<br>
Commercial register number: FN 138870x<br>
Commercial register court: Leoben</font><font size="3"><br>
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<br>
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<td width="40%"><font size="1" face="sans-serif"><b>Björn Enroth <<a href="mailto:bjorn@comnia.com">bjorn@comnia.com</a>></b>
</font>
<br><font size="1" face="sans-serif">Gesendet von: <a href="mailto:drbd-user-bounces@lists.linbit.com">drbd-user-bounces@lists.linbit.com</a></font><p><font size="1" face="sans-serif">16.04.2012 09:09</font>
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<div align="right"><font size="1" face="sans-serif">An</font></div>
</td><td><font size="1" face="sans-serif"><a href="mailto:drbd-user@lists.linbit.com">drbd-user@lists.linbit.com</a></font>
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<div align="right"><font size="1" face="sans-serif">Kopie</font></div>
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<div align="right"><font size="1" face="sans-serif">Thema</font></div>
</td><td><font size="1" face="sans-serif">[DRBD-user] Three node cluster?</font></td></tr></tbody></table>
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<td colspan="3" bgcolor="white"><font size="3">Guys, <br>
I am looking for information of how to deal with a KVM three node cluster
with DRBD <br>
<br>
I have a "baby machine" ubuntu 11.10 pacemaker/drbd cluster with
two nodes, local disks with drbd setup in between. This is working flawless. <br>
<br>
My challenge now is that I want to add a third node with the same setup.
How do I handle drbd in this setup? I'd like to have all nodes active,
to be able to migrate resources, mainly kvm virtual guests, around the
cluster as I see fit. I'd also like pacemaker to be able to dynamically
handle the load. <br>
<br>
I've been surfing' around for a while... Either I am not able to find the
right information, or it is so obvious how to handle this so I am missing
the point somewhere. Or, in worst case, this is not possible and I need
to enter another route to make this work as I want. <br>
<br>
Any ideas? <br>
<br>
Thanks a lot in advance for your patience with me </font>
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-------------------<br>
Björn Enroth<br>
Comnia Internet AB<br>
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