[Linux-cluster] Multiple clusters

[isplist at logicore.net]

In my case, I have separate GFS storage for web, mysql, mail and other parts 
of our network. 

All of the servers are in one single cluster but share their own areas. For 
example, web servers only share web storage areas, etc.

My question is... is there value in spilling these things up? 

I have enough fencing hardware to split up each section and can see only one 
benefit in that if the cluster crashes, it does not take everything down, only 
that section. Yet, all sections function as one site so, not sure about the 
value in that.

Any thoughts on this?

Mike