I have an ESX 3.5 update 5 cluster of five host servers, all fully patched as of this Friday. Today I noticed that one of the servers has the Hardware Health status as unknown in Virtual Center Infrastructure Client. When I look at the Health Status view under configuration for that host, all the items are status Unknown.
The server is exactly the same configuration as the others - same model (HP DL360 G5), memory, NICs etc.
I have tried restarting the management service with
service mgmt-vmware restart but this has not resolved the issue.
Asides from this, I am not seeing any issues with the cluster - however, I hate having a blind spot like this.