Shelf-to-shelf connection rules

When you have more than one disk shelf in a stack of disk shelves, they connect to each other through each SAS domain (IOM A and IOM B) using the applicable "standard" or "double-wide" shelf-to-shelf cabling. Your use of "standard" or "double-wide" shelf-to-shelf cabling depends on the configuration you have.

Standard shelf-to-shelf connectivity

Double-wide shelf-to-shelf connectivity