Having done a number of migrations among HP, EMC Symmetrix/Clariion, and NetApp storage, we've found the best way to migrate data is to use host-based mirroring/shadowing (different OS's have different terminology). So... you would create equivalent sized luns on the clariion, form host-based mirror relationships between the NetApp lun and the clariion lun, allow them to sync up, then break the mirror at the appropriate time. HTH.
Thank you resqme914 and AGUMADAVALLI for your response. we however have an issue here. Our environment has few racks of cisco ucs blade servers and the complete rack has only 2 FCoE cables which are connected to the cisco nexus switch.
There are no physical HBA cards, these are logical and picked up from the pool of HBA's, the same applies to enthernet card.