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<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 lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I want to point out why a virtual cluster is better than a
physical one. In my eyes it’s because of the power usage, cooling and you need
less space.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I think it’s easier to cool down one server rack than a room
full of tower. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>In one rack you put, let’s say ten ESX server. On every ESX
server you let run three nodes. So you’ve got 30 nodes.<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Is this a realistic idea? Unfortunately I am not an expert in
creating resources. So I don’t know if you need 30 nodes for any resource. <o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Von:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Pavlos Parissis </span><span
lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><a
href="mailto:[mailto:pavlos.parissis@gmail.com]"><span lang=DE>[mailto:pavlos.parissis@gmail.com]</span></a></span><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> <br>
<b>Gesendet:</b> Montag, 18. </span><span lang=EN-US style='font-size:10.0pt;
font-family:"Tahoma","sans-serif"'>Oktober 2010 10:58<br>
<b>An:</b> The Pacemaker cluster resource manager<br>
<b>Betreff:</b> Re: [Pacemaker] Question: How many nodes can join a cluster?<o:p></o:p></span></p>
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<p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US><o:p> </o:p></span></p>
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<p class=MsoNormal><span lang=EN-US>On 18 October 2010 10:52, Florian Haas <</span><a
href="mailto:florian.haas@linbit.com"><span lang=EN-US>florian.haas@linbit.com</span></a><span
lang=EN-US>> wrote:<o:p></o:p></span></p>
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<p class=MsoNormal><span lang=EN-US>----- Original Message -----<br>
> From: "Andreas Vogelsang" <</span><a
href="mailto:a.vogelsang@uni-muenster.de"><span lang=EN-US>a.vogelsang@uni-muenster.de</span></a><span
lang=EN-US>><br>
> To: </span><a href="mailto:pacemaker@oss.clusterlabs.org"><span
lang=EN-US>pacemaker@oss.clusterlabs.org</span></a><span lang=EN-US><br>
> Sent: Monday, October 18, 2010 9:46:12 AM<br>
> Subject: [Pacemaker] Question: How many nodes can join a cluster?<br>
> Hello,<br>
><br>
><br>
><br>
> I’m creating a presentation about a virtual Linux-HA Cluster. I just<br>
> asked me how many nodes pacemaker can handle. Mr. Schwartzkopff wrote<br>
> in his Book that Linux-HA version 2 can handle up to 16 Nodes. Is this<br>
> also true for pacemaker?<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><span lang=EN-US><br>
I have been asked the same question and I said to them, let's say it is 126,
what is the use of having 126 nodes in the cluster?<br>
Can someone imagine himself going through the logs to find why the resource-XXX
failed while there are 200 resources?!!<br>
<br>
The only use of having 126 nodes is if you want to have HPC, but HPC is total
different story than high available clusters.<br>
Even in N+N setup I would go with more than 4 or 6 nodes.<br>
<br>
<br>
</span>My 2 cents,<br>
Pavlos<br>
<br>
<o:p></o:p></p>
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