Cabling Channel B

Channel B loop cabling differences

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

Cabling the Channel B loops in a standard cluster

To cable the Channel B 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 port 0b of the local node, to the partner node's first disk shelf Channel B LRC, ESH, ESH2, or AT-FCX Input port.
2	Cable the partner disk shelf 1 Channel B LRC, ESH, ESH2, or AT-FCX Output port to the next disk shelf of the partner node Channel B LRC, ESH, ESH2, or AT-FCX Input port. Note The illustration shows only one disk shelf per disk pool. The number of disk shelves per pool might be different for your storage system.
3	Repeat Step 2, connecting Channel B output to input, for any remaining disk shelves in the loop.
4	Set the terminate switches on the LRC or ESH modules to Off on all but the last disk shelf in the loop, then set the LRC or ESH terminate switches on the last disk shelf to On. Note The ESH2 is self-terminating and does not have a terminate switch. The AT-FCX is self-terminating as long as no cable is plugged into the Out port of the last shelf.
5	Repeat Step 1 through Step 4 for the partner node and local disk shelves.
6	Go to Cabling the cluster adapters.

Cabling the Channel B loops in a mirrored cluster

To cable the Channel B 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 port 0b of the local node to the first partner disk shelf Channel B LRC, ESH, ESH2, or AT-FCX Input port of disk shelf pool 0.
2	Cable the dual-port FC-AL in port 0d of the local node to the first partner disk shelf Channel B LRC, ESH, ESH2, or AT-FCX Input port of disk pool 1.
3	Cable the partner disk shelf Channel B LRC, ESH, ESH2, or AT-FCX Output port to the next disk shelf Channel B LRC, ESH, ESH2, or AT-FCX Input port in the loop for both disk pools. Note The illustration shows only one disk shelf per disk pool. The number of disk shelves per pool might be different for your storage system.
4	Repeat Step 3, connecting Channel B output to input, for any remaining disk shelves in the disk pool.
5	Set the terminate switches on the LRC or ESH modules to Off on all but the last disk shelf in the disk pool, then set the LRC or ESH terminate switches on the last disk shelf to On. Note The ESH2 is self-terminating and does not have a terminate switch. The AT-FCX is self-terminating as long as no cable is plugged into the Out port of the last shelf.
6	Repeat Step 1 through Step 5 for the partner node.
7	Go to Cabling the cluster adapters.