Cluster stonith hardware recommendations

[David Barker <D R Barker exeter ac uk>]

Hi all,

I've been tasked with the job of building a HA web cluster, and seem 
relatively happy with the job clumanager in rh 3 AS does. I'm happy with 
the concept of what stonith hardware is, and what it does, I'm just 
after a few recommendations on what to get :-)

We're hoping to go for 4xDell 2650's in the cluster, which should be 
feed from a raw main's supply to the machine room, and a ups supply for 
the room.

Any comments / recommendations on what stonith hardware we should be 
looking at (e.g. two stonith devices per feed or one which has two input 
feed's and single PSU's on the hosts? Any particularly good makes/models?)