For determining the performance on a VNX, please review Chapter 5 in the attached Best Practice guide (the other White paper is a more general view of performance) - this is for VNX OE Flare 31.5, but the information about determining performance in Chapter 5 would still apply to newer versions.  glen
When supporting VNX array, need to understand the below - 1) How will we figure out the number of IOPS supported by a specific LUN configured from VNX , say "Plat Pool 1", storage pool 2) At SP port level, at Disk level 3) do we have any benchmarks to be considered like for example when dealing with bandwidth, utilization, IOPS, response times, service times, queue length, dirty pages, .. that will help us to whether the array, LUN's, ports,disks are  being optimally used.  Note: please check the attachment with details
Need inputs on handling performance related issues or queries on VNX