Carl,
What is the output of the following commands?
node run -node <node_name> sasadmin expander_map
node run -node <node_name> sasadmin shelf 'adapter_name' #adapter_name=sas_port loop is plugged into.
node run -node <node_name> sasadmin expander_map 'adapter_name'
node run -node <node_name> disk show -n