[Pacemaker] Question: How many nodes can join a cluster?

[Vogelsang, Andreas]

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.
I think it’s easier to cool down one server rack than a room full of tower.
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.

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.

Von: Pavlos Parissis [mailto:pavlos.parissis at gmail.com]<mailto:[mailto:pavlos.parissis at gmail.com]>
Gesendet: Montag, 18. Oktober 2010 10:58
An: The Pacemaker cluster resource manager
Betreff: Re: [Pacemaker] Question: How many nodes can join a cluster?


On 18 October 2010 10:52, Florian Haas <florian.haas at linbit.com<mailto:florian.haas at linbit.com>> wrote:
----- Original Message -----
> From: "Andreas Vogelsang" <a.vogelsang at uni-muenster.de<mailto:a.vogelsang at uni-muenster.de>>
> To: pacemaker at oss.clusterlabs.org<mailto:pacemaker at oss.clusterlabs.org>
> Sent: Monday, October 18, 2010 9:46:12 AM
> Subject: [Pacemaker] Question: How many nodes can join a cluster?
> Hello,
>
>
>
> I’m creating a presentation about a virtual Linux-HA Cluster. I just
> asked me how many nodes pacemaker can handle. Mr. Schwartzkopff wrote
> in his Book that Linux-HA version 2 can handle up to 16 Nodes. Is this
> also true for pacemaker?

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?
Can someone imagine himself going through the logs to find why the resource-XXX failed while there are 200 resources?!!

The only use of having 126 nodes is if you want to have HPC, but HPC is total different story than high available clusters.
Even in N+N setup I would go with more than 4 or 6 nodes.


My 2 cents,
Pavlos

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