No,  You will need to make sure that all lun's, RG's, and hot spares are destroyed on that SATA DAE.  You cannot move a DAE with data on it to another CX array and expect that you will be able to access that data.  You will need to migrate the data either to another DAE on the same storage system or to another storage system using SanCopy  Are all your hosts windows using Powerpath?  And do you have enough free space on the CX4 to cover the storage requirements for some of the data that is on the CX3?  I ask becuase in my opinion, PowerPath Migration enabler is alot easier to use and doesnt require a downtime to cutover (unless you have W2008 clusters)  It is free if you have licensed copy of powerpath.
Hi,  We are going to perform a migration from CX3 to CX4 Storage Array.  We have chosen the migration path with SANCopy instead of in-place upgrade.  There is a SATA DAE attached to the CX3 Storage Array and we would like to know whether we need to copy all data from the SATA DAE to the new CX4 Storage Array FC DAE, decommission DAE from CX3, re-create LUNs on DAE and internal migration of LUNs from FC to SATA ?   Can we just detach the SATA DAE and attach to CX4 ?  Your advice is sought.
Do we need to initialize a DAE when moved to a new Storage Array?