How to view the specific RDM LUN latency and IOPS statistics ?

Hi All,

I'm currently investigating of VMware Virtual Machine (Exchange Server) with Physical RDM LUN attached for the mailbox server performance issue in my VNX5300 array.

How to view the LUN latency and also the IOPS in realtime ?

I can get the value above from VMware using ESXtop, but not sure how to get the same value for the specific LUN using Unisphere.

thanks.