When we ran the exbpa, it complained about disk latency on our passive server. We moved that server and disks to a new san which took care of that.
We also fixed the networks so that they match what Microsoft recommends.
Finally, we installed the hotfixes today. I will update with a graph soon.
Question though:
our passive server has mail flowing through it according to headers and our spam appliance. i would think we should only have mail flowing through it when the dbs are active. Is this configured with the CAS array? could the CAS configuration be related?
So you have the hub role installed with the MBX role?
See for an explanation of behavior if so
http://technet.microsoft.com/en-us/library/ff699049.aspx
Hub Transport and Mailbox Server Roles Coexistence When Using DAGs