[Bioclusters] SGE and NFS scalability

[Steve]

We are about to start the build out of a 200 node cluster, and we plan 
to use SGE 6 for job scheduling.
The NFS device is an EMC Centera with 3 data movers, so it should shift 
data at a decent speed, but I don't know about SGE scalability.

Question:
Is anyone using SGE via NFS on this number of nodes?
Has anyone reached a CPU/scheduling limitation on a lesser number of nodes.
Would SGE with Berkeley DB be of benefit here?
Who would recommend a local install of SGE on each node?

Cheers,

Steve