I have 4x ESX 3.5 build 110268 hosts (Dell PE1950's) in a HA / DRS cluster. They were upgraded from U1 to U2 over the weekend. 3 of them have CPU0 getting stuck at 100% utilization. These are dual quad-core systems.
I have tried the following to try to resolve this:
Migrate all VMs off one of the hosts (even with 0 VMs running CPU0 has 100% utilization).
Uninstalled Dell OpenManage Server Administrator.
Restarted mgmt-vmware and vmware-vpxa services
Reconfigure for HA on all 4 hosts.
esxtop shows console using 99%, top shows cimprovagt at +97%.
Is this 100% CPU usage normal? It wasn't doing it before the U2 upgrade and I'm not sure what cimprovagt is.