After an unexpected power cut during the weekend, both Drobo FS at work restarted (21 hours later when the power was restored) but the samba/windows shares could not be accessed.
When I tried my droboStatus script, everything was displayed normally, except for one line:
|Overall status of the device
|98304 = 11000000000000000b -> UNKNOWN STATUS – please see http://code.google.com/p/drobowebdashboard/wiki/ESATMUpdate#ESATMUpdate/mStatus
As the linked page does not give an answer, it seems that it means that everything is ok after a file system check (fsck) but the shares do not work.
A simple reboot with the button at the back of the Drobos was enough to get everything on line again.