By cabling the serial-attached SCSI (SAS) ports, you can enable each controller in the HA pair to access its own disks and the disks of its partner controller.
You must have located and marked which disk shelves go with each storage controller.
Disk shelf cabling is always isolated within the HA pair that owns the disks. Disk shelves are never connected to other HA pairs in the cluster.
QSFP to QSFP SAS cables are used to connect disk shelves together and to connect disk shelves to the SAS ports on the controller.
For disk shelf I/O modules and controller onboard SAS ports, the cables must be inserted with the bottom of the connector facing down, as shown in the following image. The bottom of the connector is slightly longer than the top, and the latch release is typically on the bottom.
For controller SAS ports on add-in cards, the orientation depends on the slot in which the SAS card is installed. Insert the connector gently, and be sure that it latches securely. If the connector does not latch, rotate it 180 degrees and try again.
These instructions assume two stacks of disk shelves per HA pair. You can split your disk shelves into additional stacks to increase I/O throughput. Additional stacks require adding additional SAS ports to the storage controllers.
SAS ports on both controllers and disk shelves are indicated by the symbol.
The following example displays the DS2246 disk shelf cabling:
The following example displays the DS424x disk shelf cabling:
The following example displays the first set of controller-to-shelf cabling with DS2246 disk shelves:
The following example displays the first set of controller-to-shelf cabling with DS424x disk shelves:
The following example displays the last set of controller-to-shelf cabling with DS2246 disk shelves:
The following example displays the last set of controller-to-shelf cabling with DS424x disk shelves: