[Linux-cluster] When to use more than one cluster?

[Hagmann, Michael]

Hi Mike

at the beginning of our planning we also think so , but when you have a
Cluster problem ( like now, the rgmanager in RHEL4 u4 ) then the hole
cluster have problem and maybe crash or freeze. I would recommend you,
NOT to make only one Cluster.

Mike 

-----Original Message-----
From: linux-cluster-bounces at redhat.com
[mailto:linux-cluster-bounces at redhat.com] On Behalf Of
isplist at logicore.net
Sent: Sonntag, 1. April 2007 19:58
To: linux-cluster
Subject: [Linux-cluster] When to use more than one cluster?

Currently, all nodes, no matter what they are doing are all part of one
single cluster. So, even though they aren't sharing services or storage,
they are all part of the same cluster.

I could have one cluster for web servers and their storage, one for mail
servers, one cluster for sql servers, etc. 

Am I complicating things for myself by having one single cluster. Which
would be best in my case, multiple clusters or one single cluster?

I do see this as an easier method by which to grow in the future and
right now, things get complex when it comes to turning certain servers
on and off, changing the count of servers thereby sometimes causing the
cluster not to boot until I change the config file. 

Any thoughts or input would be very appreciated and I'm sure be of help
to some others as well.

Thanks.

Mike