I have a hyperflex (4.0.2b) cluster with 3 nodes running ESXi 6.7u3 . Cluster is Online and Healthy. In HX connect i tried to put one Node in Maintenance Mode but it failed with this message:
Sounds like there may be a pending task to go into maintenance mode, that is likely failing or stalled due to some condition (i.e. vmotion issues, guestVM has attached .ISO CD, etc,etc)
Probably need to open a TAC case.
I'm in staging phase so i rebooted everything without success. Also i manually vmotion VM's to other Hosts. The only VM on host is Controller VM. Could it be a limitation of having only have 3 nodes?
As long as the HX cluster says it's healthy, with a 3 node cluster, you can manually put one node at a time into maintenance mode.
From vcenter, you can still put any of the esxi hosts into generic vmware maintenance mode
Once you cycle through all 3 (waiting for hx cluster to become healthy once the node is out of maintenance mode, and cluster has gone through 'healing', before moving on to next node), then the hung task may clear.
I Tried your suggestion but healing didn't start and i wait more than 2 hours so i then i tried power off ungraceffully server form UCS and wait more than two hours and nothing happens ...