Finally, I upgraded the  switch IOS to 15.0(2)SE, the flowcontrol works. Cisco IOS 12.2(58)SE2 (my old IOS version)has a bug in flowcontrol.
Hello All, About 20 days ago, I upgraded firmware of my PS 4000XV to V6.0.1 without any error message. But, I found the following event in the SAN HQ: - Caution “member XXX TCP retransmit percentage of 1.2%. if this trend peresists for an hour                    or more, this could be indicative of a problem one the member's SAN network, resulting in an e-mail notification - sometimes, I would receive the following mail Caution conditions: 10/27/2012 6:36:01 AM to 10/27/2012 7:36:02 AM In fact, there was not such event in the SAN HQ before I upgrade the firmware. I only have one PS4000XV  in my enviroment. There is no change about my enviroment , e.g. OS, networking, except the firmware of PS4000XV. Did you meet the same issue?  
suspect Bug in PS Firmware v6.0.1?