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!
Are they running Insight Manager? Have you looked at KB article (ID 1016070) ?
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!
There is more info at http://www.rtfm-ed.co.uk/?p=1953 about possible work-arounds. Good luck.
That didn't seem to fix it -- one host in particular is being disconnected more often than the others, and I've disabled (and, even, uninstalled) the HP management agents.
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.