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

[Dan Frincu]

Pavlos Parissis wrote:
>
>
> 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
>
>
Actually, the syslog_facility in corosync.conf allows you to specify 
either a log file for each node in the cluster (locally), or setting up 
a remote syslog server. Either way, identifying the node by hostname or 
some other identifier should point out what is going on where. Granted, 
it's a large amount of data to process, therefore (such is the case with 
any large deployment) SNMP is a much better alternative for tracking 
issues, or (if you have _126_ times the same resource) adding some 
notification options to the RA might be a choice, such as SNMP trap, or 
even email.

BTW, I'm also interested in this, I remember reading something about 64 
nodes, but I'd appreciate an official response.

Regards,

Dan
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-- 
Dan FRINCU
Systems Engineer
CCNA, RHCE
Streamwide Romania

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