The release notes said to update vCenter to Update 3b FIRST then to update the hosts. What this did to me was isolate my hosts from vCenter, left them running but no way into them. Couldn't use the VI Client, SSH or iLo until I rebooted the hosts with the running VM's on them (causing them to crash obviously). Anyone else experience this? I can't find anything from VMware.. Although in another environment we have vCenter 5.5 Update 3a is managing an ESXi 5.5 3b host without any issues.. Did they just get this backwards? I've been finding issues contradictory statements in the release notes as of late. I wish I could've stayed on 4.1. 5.5 has been really buggy and unpredictable. If anyone has come across this and found a better solution then please hit me up.
Thanks!