From the VI client, if I select one of my hosts, it changes to 'not responding' and becomes italic, along with all it's running VMs.
When I select another host, the 'not responding' one starts working again. If I select it again, it immediately goes not responding. This is an issue if I wanted to go into maint mode or rescan the SAN.
However, the ESX host is still working from all other perspectives. The VMs are fine, I can SSH into the host, it doesn't log out of the SAN fabric, it's just sort of annoying/causes the virtual machine admins to freak out when 20 or so VMs become italic.
Anyone have an idea where to start? I had this issue in the past, and I think I solved it via reinstalling ESX, but it's happening again now, and I suspect there's an easier solution, like unjoining/rejoining the DRS cluster, or reinstalling the vpxagent somehow, rejoining the farm, etc. The only thing we've done was restart VirtualCenter (to solve another issue) and it didn't seem to help with the 'intermittent not responding' issues.
Any ideas?