To connect the new Expansion shelf

1. Verify that all compute nodes, the Primary shelf, and the existing Expansion shelves are off and that the power cords are unplugged.

   Do not remove the cables between the compute nodes, the Primary shelf, and the two Expansion shelves.

2. Identify the single SAS-3 port on the right side of each controller module in the Primary Shelf.
   
3. Identify ports A and C in each I/O module in the Expansion shelf. Port B is not available for use.
   
4. Connect the cables as follows:

   • Unplug the cable on the Primary shelf right I/O module where it connects to port A on the farthest existing Expansion shelf right I/O module.

   • Attach the other end of this cable to port A in the right I/O module of the new, third, Expansion shelf.

   • Obtain the two SAS3 cables that shipped with the new Expansion shelf.

   • Attach the end of one cable to SAS port C in the left-hand I/O module of the farthest existing Expansion shelf.

     Attach the other end of the cable to SAS port A in the left-hand I/O module of the new Expansion shelf.

   • Attach one end of the second cable to SAS port A in the right-hand I/O module of the farthest existing Expansion shelf.

     Attach the other end of the cable to SAS port C in the right-hand I/O module of the new Expansion shelf.

5. Verify the final cable configuration.

   The following figure shows the cabling diagram for a two-node configuration:

   

   The following figure shows the cabling diagram for a single-node configuration:

   
6. Connect the power cords of all devices as described in this section.

   See Connecting the power cords to the hardware.

7. Turn on the devices in the proper sequence as described in this section.

   See Turning on the hardware and verifying operation.

8. Add the new disk space as described this section.

   See Adding the disk space of an Expansion Storage Shelf from the Access Appliance shell menu.