About the disk shelf modules

A disk shelf module (ESH4 or AT-FCX) in a DS14mk2, DS14mk4 FC or DS14mk2 AT includes a SCSI-3 Enclosure Services Processor that maintains the integrity of the loop when disks are swapped and provides signal retiming for enhanced loop stability. When upgrading or replacing a module, you must be sure to cable the modules correctly.

The DS14mk2, DS14mk4 FC or DS14mk2 AT disk shelves support the ESH4 or AT-FCX modules.

There are two modules in the middle of the rear of the disk shelf, one for Channel A and one for Channel B.

Note: The Input and Output ports on module B on the DS14mk2/DS14mk4 FC shelf are the reverse of module A.