We're running vCenter 7.0U3j now with 5 ESXi hosts in a single cluster using 4 shared datastores for HA heartbeats, and after I patched to this version - actually, WHILE I was patching it using the VAMI, I was monitoring the console on the host the VCSA is running on and suddenly, it vanished. It was not listed in Virtual Machines on the host. I went through each host to find it since it was still pinging the IP, and low and behold, it was on another host. I was able to log back into it to watch it complete the update. Once the services came back up for the vSphere Client, I logged in and there were messages on the cluster level about HA resources:
vSphere HA initiated a failover action on 25 virtual machines in cluster [our-cluster-name] in datacenter [our-datacenter-name]
Insufficient resources to satisfy vSphere HA failover level on cluster [our-cluster-name] in [our-datacenter-name]
Something happened, but nothing noticeable to users, and none of the hosts actually went down, and there's still a running VM remaining on the original host the VCSA started on. I clear whatever alerts I could, but these two are in blue and there are no options to reset to green or Acknowledge them, so it looks like a configuration issue or an anomaly.
Anyone have a clue what might've happened here? What logs can I check for this to see what happened?
