Maintenance Mode task hangs
I told one of my nodes to enter maintenance mode and it sat for overnight like this:
That screenshot was taken almost exactly 26 hours later. There were no running VMs on the host, nothing on the local datastore, no resyncing or rebuilding objects in vSAN, and lastly nearly zero IO on the network adapters.
I tried canceling the task, it would not cancel.
I rebooted the host, it came back into the cluster with that task still running.
I rebooted my vCenter, and that finally killed the task.