Lenovo ThinkServer Storage SA120 - Manual (Page 32)

Figure 14. Connecting a storage array to a server
Connecting two to eight storage arrays to a server
You can connect two to eight storage arrays to a server through cascading mode. The procedure for
connecting more than one storage arrays to a server can be divided into two parts:
1. Connect a storage array to a server.
2. Connect the storage arrays to each other.
Note: Each mini-SAS connector on the RAID card or on the Host Bus Adapter installed in the target server
can support up to four storage arrays.
To connect two to eight storage arrays to a server, do the following:
1. Connect a storage array to a server. See “Connecting a storage array to a server” on page 19.
2. Do the following to connect one storage array to another:
a. Connect one end of a mini-SAS signal cable to the SAS-out connector on a rear I/O module (for
example, rear I/O module 1) of a storage array.
b. Connect the other end of the mini-SAS signal cable to the SAS-in connector on the corresponding
rear I/O module (for example, rear I/O module 1) of another storage array.
c. For storage arrays with two rear I/O modules, you can repeat step a and step b to connect a
mini-SAS signal cable to the secondary rear I/O modules (for example, rear I/O module 2).
Note: Connecting the storage arrays to each other through two rear I/O modules provides
redundancy, which helps avoid significant interruption to the connection of the storage arrays when
a rear I/O module fails.
20 ThinkServer Storage SA120 User Guide and Hardware Maintenance Manual