We have a New box with no load on it, we have added some thin luns to SUN server bounded to FC Thin pool, and fast vp was never enabled at all.. But Server admins complains that his IBM Disk has good read and write responses time compared to the new EMC Disk, he tried creating 10 GB files on both IBM array and EMC array, IBM outperforms EMC.. 

Everything has been set properly including flag settings, multipathing , but still we have a poor performance, any one has any suggestions or recommendation?