I have a cluster of five ESX 4 hosts (they are all HP BL25p G1 Blades); since upgrading from 4.0.0 to 4.0 U1 I am experiencing intermittent issues with the hosts disconnecting from vCenter Server. That is, I will be working in the vSphere Client and occasionally (perhaps once or twice a day, per host) the host will suddenly change its status to "Disconnected".
At this point, the VMs on the host are still running, but of course I cannot control them via the vSphere Client. The 4.0 U1 update is the only change I've made to the hosts; there have been no networking or other back-end changes made since then. I have two other ESX 4 clusters -- which are still at 4.0.0 -- and, despite them sharing the same networking resources, they are not disconnecting; which leads me to think it's a bug introduced in 4.0 U1.
Has anyone else experienced this? Thanks!
Thanks; I actually saw that KB article after I upgraded the cluster. That's why I have a test cluster, I suppose I'll disable the agents and see if that stops the problem. I'll let you know!
Run these commands from the esx console.
service mgmt-vmware restart
service vmware-vpxa resstart
service vmware-vmkauthd restart
I've had this happened to me several times and this was the only way to fix the disconnects. Restarting those services will not bring anything down BTW.