About SP, front end director, back end Director, SP

With the concept of spa and SPB in Vnx, LUNs are linked to spas and SPB for redundancy.

There is no concept of SP in Vmax, only front-end director and Back-end director. They support different protocols, FC, iSCSI, FCoE, depending on configuration, LUNs are attached to two FRONT-FA ports for IO redundancy, LUNs are just a sign that communicates with real disk via Back-end port.

Front end director Ports, San, host HBA, Lun, and back end director, disks

About SP, front end director, back end Director, SP