Bottom Connections; Verifying Sas Connections - IBM N Series Hardware Manual

6.1.4 Bottom connections

The bottom ports of the SAS shelves are connected to the HA pair controllers as shown in
Figure 6-5.
Figure 6-5 SAS shelf cable bottom connections
Figure 6-5 is a fully redundant example of SAS shelf connectivity. No single cable failure or
shelf controller causes any interruption of service.

6.1.5 Verifying SAS connections

After you complete the SAS connections in your storage system using the applicable cabling
procedure, verify the SAS connections. Complete the following procedure to verify that the
storage expansion unit IOMs have connectivity to the controllers:
1. Enter the following command at the system console:
sasadmin expander_map
Tip: For Active/Active (high availability) configurations, run this command on both nodes.
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IBM System Storage N series Hardware Guide