You didn't provide enough details such as protocol (Fibre Channel?), OS type of server, etc., but in general the answer would be yes it's possible. We migrated our data contained in unix, OpenVMS, and Windows hosts, from EMC Symmetrix to NetApp FAS by mapping NetApp FC luns to the hosts which were already using EMC luns. I'd say be careful about the lun id's and make sure they are unique. HTH.