Following an incomplete or interrupted shutdown of the vSAN cluster via the vSAN Shutdown cluster wizard, and subsequent manual restart of the nodes and system VMs, the vSphere UI page at Cluster > Configure > vSAN > Services remains at the last completed step and with header 'The shutdown process is paused due to a failure'.
This state is caused due to incomplete or interrupted shutdown of the vSAN cluster after partially completing the shutdown procedure via the cluster Shutdown wizard.
This state can be cleared by manually restarting the vsan-health service on the vCenter managing this cluster via SSH to the vCenter VM:
# service-control --stop vmware-vsan-health
# service-control --start vmware-vsan-health
Or via the vCenter Server Management Interface by restarting the vmware-vsan-health service: