HP Direct-Connect External SAS Storage for HP BladeSystem Solutions Depoyment Guide

MSA2000sa controller enclosure port information
As shown in the following illustration:
SAS host ports: two per controller. Labeled SAS Port 0 and SAS Port 1. Use these SAS host
ports to connect to the hosts (switch).
When two controllers are installed in the enclosure, the controllers are referred to as follows:
Top controller: A, with host ports referred to as A0 and A1
Bottom controller: B, with host ports referred to as B0 and B1
SAS expansion port: one per controller. Labeled SAS, with a diamond symbol at the bottom
of the label. Use this SAS expansion port to connect (cascade) additional MSA2000 drive
enclosures.
88 Device SAS port information