I would recommend checking the SRDF Connectivity guide as well, however, some customers may find it a bit advanced so to make the long story short and without going into further FC details,  VMAX uses Parallel IO/ RoundRobin mechanism for load balancing for RF dirs. Around 2000-2500 IOPs are sent out of each RF director slice( CPU can take more than that but this is the average number i have seen through many boxes), You cannot limits the IOPs per each RDF director slice so a fairness mechanism will try to ensure that IOPs are evenly balanced across RF dirs. This applies to SRDF/s for SRDF/A it is a bit different as available caching is taking into considerations.  For REs, It works by establishing tcp sessions from one RE to all REs in the remote arrays  [NAME] has detailed this in another Community thread.  [URL]#825217  Hope this helps Mohammed Salem
Greetings Everyone,  I am wondering how SRDF handles multipathing.  For example, we have a source and target array in different data centers.  Each array has two RA-ports.   These RA-ports are connected via two separate, geographically diverse InterSwitch Links (ISLs).  What happens during an SRDF transmission if I lose one of these paths?  Does the VMAX/RAport know to retransmit?  Any input is appreciated.  Whitepapers and documents are appreciated even more. [IMAGE]  Regards,  Julianne
How does Synchronous SRDF handle multi-pathing?