Here is the current Support Statement provided by EMC:
- The minimum supported VPLEX release is VPLEX 5.3
- write same" feature is supported on Pure Storage System
- When connecting multiple Pure Storage Systems with VPLEX, VPLEX may display them as one single storage system. Please be aware that this issue will not cause any functional failure. It's a display issue. A single array is recommended to connect until a fix is available for the issue.