IBM N series Hardware Manual page 164

Figure 9-7 Stretch MetroCluster using SAS optical cables
Complete the following steps:
1. Complete the SAS cabling worksheet in the Universal SAS and ACP Cabling Guide.
You must know the controller SAS ports that you plan to use to cable your system (with
SAS optical cables).
2. Verify that your system is Multi-Path HA by running the following command at the console
of both nodes:
sysconfig
Note: It might take up to a minute for the system to complete discovery.
The configuration is listed in the System Storage configuration field. It should be the fourth
line of output.
Caution: If your system configuration is shown as something other than Multi-Path HA,
identify the cabling issue and correct it before continuing with this procedure.
3. Verify that the disk shelves in the storage system have the latest version of disk shelf
firmware by completing the following steps:
a. Enter the following command at the storage system console:
sysconfig -v
b. Locate the disk shelf firmware information for the disk shelves in the output.
Example: 0151 is the disk shelf firmware version for shelf number one (for each IOM6)
in the storage system:
Shelf 1: IOM6 Firmware rev. IOM6 A: 0151 IOM6 B: 0151
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IBM System Storage N series Hardware Guide