Cabling Channel A

Channel A loop cabling differences

The procedure for cabling the Channel A loops for a standard cluster and mirrored cluster are different. Follow the directions in the appropriate section:

Cabling the Channel A loops in a standard cluster

To cable the Channel A loops in a standard cluster, complete the following steps, using the diagram for reference.

Step	Action
1	Cable the dual-port FC-AL adapter in slot 2, Top port to the disk shelf 1 Channel A LRC, ESH, or ESH2 Input port.
2	Cable the disk shelf 1 Channel A LRC, ESH, or ESH2 Output port to the disk shelf 2 Channel A LRC, ESH, or ESH2 Input port. Label this cable with a solid-colored label.
3	Repeat Step 2, connecting output to input, for the remaining disk shelves in the loop.
4	Set the terminate switches on the LRC, ESH, or ESH2 modules to Off on all but the last disk shelf in the loop, then set the LRC, ESH, or ESH2 terminate switches on the last disk shelf to On.
5	Repeat Step 1 through Step 4 for the partner node.
6	Go to Cabling Channel B.

Cabling the Channel A loops in a mirrored cluster

To cable the Channel A loops in a mirrored cluster, complete the following steps, using the diagram for reference.

Step	Action
1	Cable the dual-port FC-AL adapter in slot 8, Top port of the local node to the disk shelf 1 Channel A LRC, ESH, or ESH2 Input port of disk pool 1, then cable the dual-port FC-AL in slot 5, Top port of the local node to the disk shelf 3 LRC, ESH, or ESH2 Input port of disk pool 0.
2	Cable the local node's disk shelf 1 Channel A LRC, ESH, or ESH2 Output port to the disk shelf 2 Channel A LRC, ESH, or ESH2 Input port for both disk pools. Label this cable with a solid-colored label.
3	Repeat Step 2 connecting Channel A output to input, for any remaining disk shelves in the disk pool. Note The illustration shows only two disk shelves per disk pool. The number of disk shelves per pool might be different for your appliance.
4	Set the terminate switches on the LRC, ESH, or ESH2 modules to Off on all but the last disk shelf in the disk pool, then set the LRC, ESH, or ESH2 terminate switches on the last disk shelf to On. Note ESH2 modules are auto-sensing, and therefore do not have a terminate switch.
5	Repeat Step 1 through Step 4 for the partner node.
6	Go to Cabling Channel B.