I have 3 servers on a SAN:

Servers A & B in one Cluster1 for data access. (A is normally "Master Mode"
and B is "Node Running")
Servers B & C in another Cluster2 for GroupWise. (C is "Master Node" but
iManager reports B as "Unknown Node State")

(all servers are OES2 Linux)

Cluster1 works perfectly well and fails over between servers when one is
shut down (or just swapped over within iManager).

As Cluster2 does not know the state of Server B, it won't failover.
However, in Cluster1, all is OK. I keep comparing the two and all looks
fine, but I am obviously blind as I can't see what is missing.

Any pointers would be really appreciated!