Port pair connection rules (for non AFF A200, AFF A220, FAS2600 series and FAS2700 configurations)
Controller SAS ports A, B, C, and D are organized into port pairs using a method that leverages all of the SAS
ports for system resiliency and consistency when cabling controller-to-stack connections in HA pair and single-
controller configurations.
• Port pairs consist of a controller A or C SAS port and a controller B or D SAS port.
A and C SAS ports connect to the logical first shelf in a stack. B and D SAS ports connect to the logical last
shelf in a stack.
• Port pairs use all SAS ports on each controller in your system.
You increase system resiliency by incorporating all SAS ports (on an HBA in a physical PCI slot [slot 1-N]
and on board the controller [slot 0]) into port pairs. Do not exclude any SAS ports.
• Port pairs are identified and organized as follows:
a. List A ports and then C ports in sequence of slots (0,1, 2, 3, and so on).
For example: 1a, 2a, 3a, 1c, 2c, 3c
b. List B ports and then D ports in sequence of slots (0,1, 2, 3, and so on).
For example: 1b, 2b, 3b, 1d, 2d, 3d
c. Rewrite the D and B port list so that the first port in the list is moved to the end of the list.
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