[Linux-cluster] Cluster for number-crunching purposes

[Riaan van Niekerk]

Fedele Stabile wrote:
 >>> I have a new 35-nodes cluster with a SAN for data storage, my SAN  is
 >>> connected via SCSI with two nodes.
 >>> OS is CentOS4 with ClusterSuite
 >>> Cluster purpose is numer-crinching:
 >>> SAN disks are GFS and exported via gnbd to the other 33 nodes in  the
 >>> cluster.


Fedele Stabile wrote:
> I experienced that using vote=1 for all members gives the same quorum 
> votes as result of command
> cman_tool status
> 
> Instead i woulk create a quorum disk on SAN storage.
> Can you help me?
> 

If you need help with qdisk, the best documentation for it at the moment 
is via "man qdisk" (also assuming you use CentOS / Cluster Suite 4.4.

I need to make you aware of the following as per the man page:
"At this time, this daemon supports a maximum of 16  nodes.   This  is 
primarily  a  scalability issue:  As we increase the node count, we 
increase the amount of synchronous I/O contention on the shared quorum 
disk."

so using qdisk with 35 nodes may either
a) still work but not be supported - not a problem if you are running 
CentOS)
b) not work at all, meaning it will not be an option for you.

greetings
Riaan

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