Performance Data for VM Disks

Hi,

I'm seeing a lots of IOPs and High Read Latency on the RDM Mapping which contains the vRDM Mapper. Is this latency normal? Or something wrong with my SAN Storage?

This VM has Repository LUNs as vRDM and Symantec Backup Exec 2012 is backing up from these vRDMs which assigned to the VM, Symantec job rate decreased from 3 GB/m to 500/600 mb/m

Screen shots are attached for your advise.

Thanks,