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Thompson, Mark wrote:
<blockquote
cite="mid5514E26926513E49B8C19E822B2904A5149C67@EXCH-NOT-MSG01.uk.experian.local"
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<title>2 node OCFS2 clusters</title>
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<div class="Section1">
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Hi
Srini,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Thanks
for the response.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">So
are the following statements correct:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">If
I stop the networking on node 1, node 0 will continue to
allow OCFS2 filesystems to work and not reboot itself. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">If
I stop the networking on node 0, node 1 (now being the lowest
node?) will continue to allow OCFS2 filesystems to work and not reboot
itself.</span></p>
</div>
</blockquote>
In both the cases node 0 will survive, because that's the node that has
lowest node number (defined in cluster.conf). This applies to the
scenario where interconnect went down but nodes are healthy and are
heartbeating to the disk.<br>
<blockquote
cite="mid5514E26926513E49B8C19E822B2904A5149C67@EXCH-NOT-MSG01.uk.experian.local"
type="cite">
<div class="Section1">
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">I
guess I just need to know if it’s possible to have a 2
node OCFS2 cluster that will cope with either one of the nodes dying,
and have
the remaining node still provide service.</span></p>
</div>
</blockquote>
If node 0 itself panics, reboots then node 1 will survive.<br>
<blockquote
cite="mid5514E26926513E49B8C19E822B2904A5149C67@EXCH-NOT-MSG01.uk.experian.local"
type="cite">
<div class="Section1">
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Mark
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<div>
<div
style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0cm 0cm;">
<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;"
lang="EN-US">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif"; color: windowtext;"
lang="EN-US">
Srinivas Eeda [<a class="moz-txt-link-freetext" href="mailto:srinivas.eeda@oracle.com">mailto:srinivas.eeda@oracle.com</a>] <br>
<b>Sent:</b> 16 November 2009 14:57<br>
<b>To:</b> Thompson, Mark<br>
<b>Cc:</b> <a class="moz-txt-link-abbreviated" href="mailto:ocfs2-users@oss.oracle.com">ocfs2-users@oss.oracle.com</a><br>
<b>Subject:</b> Re: [Ocfs2-users] 2 node OCFS2 clusters<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In a cluster with more than 2 nodes, if a
network on one
node goes down, that node will evict itself but other nodes will
survive. But
in a two node cluster, the node with lowest node number will survive no
mater
on which node network went down.<br>
<br>
thanks,<br>
--Srini<br>
<br>
Thompson, Mark wrote: <o:p></o:p></p>
<p><span style="font-family: "Calibri","sans-serif";">Hi,</span><o:p></o:p></p>
<p><span style="font-family: "Calibri","sans-serif";">This is my
first post here
so</span> <span style="font-family: "Calibri","sans-serif";">please be
gentle
with me.</span><o:p></o:p></p>
<p><span style="font-family: "Calibri","sans-serif";">My question is,
can you
have a 2 node OCFS2 cluster, disconnect one node from the network, and
have the
remaining node continue to function normally? Currently we have a 2
node
cluster and if we stop the NIC that has the OCFS2 o2cb net connection
running
on it, the</span> <span style="font-family: "Calibri","sans-serif";">other
node
will reboot itself.</span> <span
style="font-family: "Calibri","sans-serif";">I
have researched having a 2 node OCFS2 cluster but so far I have been
unable to
find a clear solution. I have looked at the FAQ regarding quorum,</span>
<span style="font-family: "Calibri","sans-serif";">and my OCFS2 init
scripts are
enabled etc.</span><o:p></o:p></p>
<p><span style="font-family: "Calibri","sans-serif";">Is this
possible, or should
we look at alternative solutions?</span><o:p></o:p></p>
<p><span style="font-family: "Calibri","sans-serif";">Regards,</span><o:p></o:p></p>
<p><span style="font-family: "Calibri","sans-serif";">Mark</span><o:p></o:p></p>
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</pre>
<pre><o:p> </o:p></pre>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Ocfs2-users mailing list<o:p></o:p></pre>
<pre><a href="mailto:Ocfs2-users@oss.oracle.com">Ocfs2-users@oss.oracle.com</a><o:p></o:p></pre>
<pre><a href="http://oss.oracle.com/mailman/listinfo/ocfs2-users">http://oss.oracle.com/mailman/listinfo/ocfs2-users</a><o:p></o:p></pre>
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