Fujitsu ETERNUS AX Series Installation And Cabling Manual page 22

| Controller-to-stack cabling worksheets and cabling examples for common multipath HA configurations |
Multipath HA with two quad-port SAS HBAs and two multi-shelf stacks
Four port pairs are available for this configuration: 1a/2b, 2a/1d, 1c/2d, and 2c/1b. You can cable port pairs in
the order in which they are identified (listed in the worksheet) or you can cable every other port pair (skip port
pairs).
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.
The following worksheet and cabling example shows port pairs being used in the order in which they are
listed in the worksheet: 1a/2b, 2a/1d, 1c/2d, and 2c/1b.
The following worksheet and cabling example shows port pairs being skipped to use every other one in the
list: 1a/2b and 1c/2d.
Note: If a third stack is added later, you use the port pair that was skipped.
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