8 March update: 536FLB with bnx2fc driver version 1.710.70.v55.3 and VPLEX seems to working.
Shortly: HP FlexFabric 10Gb 2-port 536FLB Adapter for HP BL460c Gen9 and EMC VPLEX in VMware environment does not seems to be working. All paths appear as “dead”
According to quick specs the HP FlexFabric 10Gb 2-port 536FLB Adapter uses QLogic 57840S chip. ESXi identifies this card has Broadcom NetXtreme II BMC57840. It is most likely that the chip is provided by Broadcom as both companies have entered into ASIC partnership
EMC KB article (000192744 Version:2) is about Broadcom 57810 series chips but the symptoms seems to be the same with 57840 chip. The article says that this issue is caused by non-standard SCSI Command Opcode.
VMware support matrix for connectivity to VPLEX
To avoid unpleasant surprises always check multiple support matrices!