Re: RecoverPoint - slow storage, bad Fibre Channel cable, or other connectivity issue
Have you opened a case to have EMC check the SP ports on the VNX or swap those gbics? This error can mean alot of different things and your troubleshooting is the right direction. In the past I have had SP issues cause this and that prompted the replacement of Sfps and parts on the SP to correct. It might be worth looking into because you cable swaps and other actions already done are the right techniques to use. It could also be the ports on the RPAs...low tx/rx , etc.
After trying a bunch of the normal stuff I usually open a case if they don't fix the issue because there might be more details in the splitter logs and rpa logs that indicate a hardware issue.