I was just informed that as of last week VPLEX Metro with Geosynchrony 5.2 has been certified for a round trip (RTT) latency up to 10ms while running HA/DRS in a vMSC solution. So far all vMSC solutions had been certified with 5ms RTT and this is a major breakthrough if you ask me. Great to see that EMC spent the time certifying this including support for HA and DRS across this distance.
Round-trip-time for a non-uniform host access configuration is now supported up to 10 milliseconds for VPLEX Geosynchrony 5.2 and ESXi 5.5 with NMP and PowerPath
More details on this topic can be found here: