While in vcenter, the summary tab for a host displays this message:
"This host currently has no management network redundancy"
I attached pictures of the Host > Configuration > Networking and Host > Configuration > Networking Adapters pages. It looks to me like the management network is behind 2 nics teamed together.
What am I doing wrong? How can I fix this?
Did you add the second uplink just recently? Is there an uncleared warning/alarm which needs to be acknowledged?
If this is not the case you may try to restart the Management Network on the host.
It looks like the HA agent (FDM) on the host did not automatically update its configuration after you added the second NIC to the vSwitch. "Reconfigure for HA" or disable/enable HA in the cluster settings basically force the configuration.
I had something similar for 2 of 3 hosts - my conclusion was it was because those hosts were rebooted while vCenter was offline/frozen a few days ago.
Yes, "Reconfigure for HA" fixed the problem for both, now that vCenter was up.
Then, many of my machines suddenly displayed error with current time "VSphere HA machine failover failed" - not sure if this indicates the HA action failed back when the vCenter was offline 2 days ago but it was only logging it with time-tag now since I restarted HA - or that the reconfigure was threatening to reboot my guests???