Controller-to-stack connection rules
You can correctly cable the SAS connections from each controller to each stack in an HA
pair or in a single-controller configuration by understanding that SAS disk shelves use
software-based disk ownership, how controller ports A/C and B/D are connected to
stacks, how controller ports A/C and B/D are organized into port pairs, and how AFF
A200, AFF A220, FAS2600 series and FAS2700 system ports 0b and 0a are connected
to stacks.
SAS disk shelf software-based disk ownership rule
SAS disk shelves use software-based disk ownership (not hardware-based disk ownership). This means that
disk drive ownership is stored on the disk drive rather than it being determined by the topology of the storage
system’s physical connections (as it is for hardware-based disk ownership). Specifically, disk drive ownership is
assigned by ONTAP (automatically or by CLI commands), not by how you cable the controller-to-stack
connections.
SAS disk shelves should never be cabled using the hardware-based disk ownership scheme.
Controller A and C port connection rules (for non AFF A200, AFF A220, FAS2600 series and FAS2700
configurations)
• A and C ports are always the primary paths to a stack.
• A and C ports always connect to the logical first disk shelf in a stack.
• A and C ports always connect to disk shelf IOM ports 1 and 2.
IOM port 2 is only used for quad-path HA and quad-path configurations.
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