I have 4 ESX hosts running Vshpere 4.1. I started to replace the Dell 1950 hosts with Dell R610 hosts. So far I have replaced 2 of the hosts and placed them in a separate cluster. My Virtual center server is a VM. Today, I moved my Virtual Center server to the new cluster. (No EVC, I powered off the VC server and dissconnected from host in old cluster, then attached it on a host in the new cluster) Everything is running fine except about once an hour, I get email alerts that all 4 hosts are not responding. I'm sure there is a setting on the old hosts that I did not mimic on the new hosts.
Hoping that someone here has seen this and has the answer.