Ankit, thank you for the white paper! Let me to answer my question by myself if somebody will serach the same information.  The migration at the same size LUN are allowed while wirrorview working.  For migration to larger LUN you should remove secondary image and destroy the mirror (if any write to the source LUN accur, ful sync will be required after the new mirror will be recreated)  
Hi All! We have 2 CX4 arrays with the same config. Both of them have classic raid groups. 1st has 4 LUNs. Those 4 luns has mirrorview/s sessions to the 2nd cx4 array. Now I`m about to add 1 DAE to each array and create POOL. I will need to migrate all LUNs to new DAE with new POOL, after that I will destroy old raidgroups and add disks to the new pool.  So i wonder if I can migrate source and target LUNs from the raid group to the pool without mirror destroy?   All actions will be perfomed on working system. I guess that migration will take about 24 hours, so i dont want to interrupt mirrorview sessions.
Lun migration with mirrorview/s (source and target)