Have in mind the latency you see in vCenter is VM or LUN based, where you need to consider that the vmkernel, the HBA, the transport layer and the storage target have their own latencies. Don't know what latency you are checking on your SAN. Check this great KB to monitor latancy on ESX server: VMware KB: Using esxtop to identify storage performance issues for ESX / ESXi (multiple versions)
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