Fujitsu ETERNUS AX Series Installation And Cabling Manual page 41

| Controller-to-stack cabling worksheet template for multipathed connectivity |
For example, in a multipath HA configuration with eight SAS ports and four stacks, port pair 1a/2b is
cabled to stack 1, port pair 2a/1d is cabled to stack 2, port pair 1c/2d is cabled to stack3, and port pair
2c/1b is cabled to stack 4.
When not all port pairs are needed to cable the stacks in your system, skip port pairs (use every other port
pair).
For example, in a multipath HA configuration with eight SAS ports and two stacks, port pair 1a/2b is cabled
to stack 1 and port pair 1c/2d is cabled to stack 2. If two additional stacks are hot-added later, port pair
2a/1d is cabled to stack 3 and port pair 2c/1b is cabled to stack 4.
Note: When you have more port pairs than you need to cable the stacks in your system, the best practice
is to skip port pairs to optimize the SAS ports on your system. By optimizing SAS ports, you optimize your
system's performance.
You can use your completed worksheet to cable your system.
5. If you have a single-controller (multipath) configuration, cross out the information for controller 2.
You can use your completed worksheet to cable your system.
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