Yes, you can restart the Management at any time, this have no relation to the Storage Part.
> restart mc A/B or in the GUI
You can also restart the Storage Controller one by one, if you have a redundant configuration.
> restart sc A/B or in GUI
Restart SC also restart MC.
Check in the vCenter Hosts, if you have an active Path to both Controllers.
Wait for the second until everything is up again.