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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">AT the moment we have an active/passive head node setup for OpenNebula with a SAN backend for the image repository. Opennebula service is managed by redhat
clustering as is the GFS2+CLVM file system. We run a few virtual machines on the frontend machines as well. If we were using an ssh-based transfer manager that would not work, nor did it work when we were using a gfs2+drbd file system for the image repo.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">We are thinking instead to shift the ONE head node to be a live-migrateable virtual machine (or machines), the problem is how to get the VM to hook into the
clustered file system with good bandwidth.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Steve Timm<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> users-bounces@lists.opennebula.org [mailto:users-bounces@lists.opennebula.org]
<b>On Behalf Of </b>Shankhadeep Shome<br>
<b>Sent:</b> Friday, March 28, 2014 4:53 PM<br>
<b>To:</b> Stuart Longland<br>
<b>Cc:</b> users<br>
<b>Subject:</b> Re: [one-users] Architecture advice<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">What is your definition of large? This is a difficult question to answer without more details.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Mar 26, 2014 at 7:08 PM, Stuart Longland <<a href="mailto:stuartl@vrt.com.au" target="_blank">stuartl@vrt.com.au</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">On 18/03/14 02:35, Gandalf Corvotempesta wrote:<br>
> Hi to all<br>
> i'm planning a brand new cloud infrastructure with opennebula.<br>
> I'll have many KVM nodes and 3 "management nodes" where I would like<br>
> to place OpenNebula, Sunstone and something else used to orchestrate<br>
> the whole infrastructure<br>
><br>
> Simple question: can I use these 3 nodes to power on OpenNebula (in<br>
> HA-Configuration) and also host some virtual machines managed by<br>
> OpenNebula ?<o:p></o:p></p>
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<p class="MsoNormal">I could be wrong, I'm new to OpenNebula myself, but from what I've seen,<br>
the management node isn't a particularly heavyweight process.<br>
<br>
I had it running semi-successfully on an old server here (pre<br>
virtualisation-technology). I say semi-successfully; the machine had a<br>
SCSI RAID card that took a dislike to Ubuntu 12.04, so the machine I had<br>
as the master would die after 8 hours.<br>
<br>
I was using SSH based transfers (so no shared storage) at the time.<br>
<br>
Despite this, the VMs held up, they just couldn't be managed. This<br>
won't be the case if your VM hosts mount any space off the frontend<br>
node: in which case a true HA set-up is needed. (And lets face it, I<br>
wouldn't recommend running the master node as a VM if you're going to be<br>
mounting storage directly off it for the hosts.)<br>
<br>
Based on this it would seem you could do a HA setup with some shared<br>
storage between the nodes, either a common SAN or DR:BD to handle the<br>
OpenNebula frontend.<br>
<br>
Seeing as OpenNebula will want to control libvirt on the hosts (being<br>
that you're also suggesting making these run the OpenNebula-managed VMs<br>
too, this might have to be a KVM process managed outside of libvirt.<br>
Not overly difficult, just fiddly.<br>
<br>
But, as I say, I could be wrong, so take the above advice with a grain<br>
of salt.<br>
<br>
Regards,<br>
<span class="hoenzb"><span style="color:#888888">--</span></span><span style="color:#888888"><br>
<span class="hoenzb">Stuart Longland</span><br>
<span class="hoenzb">Systems Engineer</span><br>
<span class="hoenzb"> _ ___</span><br>
<span class="hoenzb">\ /|_) | T: <a href="tel:%2B61%207%203535%209619">
+61 7 3535 9619</a></span><br>
<span class="hoenzb"> \/ | \ | 38b Douglas Street F: <a href="tel:%2B61%207%203535%209699">
+61 7 3535 9699</a></span><br>
<span class="hoenzb"> SYSTEMS Milton QLD 4064 <a href="http://www.vrt.com.au" target="_blank">
http://www.vrt.com.au</a></span></span><o:p></o:p></p>
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