In the VPLEX best practices it states that there should be be 2 or 4 (optimal) paths from the back end to a volume. If using 4 paths and one of them goes down then both Unisphere and vplexcli (various health check commands) indicate that there is no issue. It is not until just one path remains that either tool highlight a problem. At this time the number of paths is reduced from 4 to 1!

Has anyone come across this issue and a way to effectively monitor the back end for intial path failure?