Cabling Disk Shelves Together

Use the following procedure to cable disk shelves together using copper SAS cables. Active optical cables (AOCs) are allowed for Oracle Storage Drive Enclosure DE3-24/DE3-12 disk shelves in special circumstances as indicated here.

• For Oracle Storage Drive Enclosure DE3-24/DE3-12 disk shelves within the same cabinet, use 1-meter (3.28-foot) SAS-3 cables; for Oracle Storage Drive Enclosure DE2-24 and Sun Disk Shelves within the same cabinet use 2-meter (6.56-foot) SAS-2 cables.

• For Oracle Storage Drive Enclosure DE3-24/DE3-12 disk shelf cabling extending between adjacent cabinets, use 3-meter (9.84-foot) SAS-3 cables.

• For Oracle Storage Drive Enclosure DE3-24/DE3-12 disk shelf cabling extending between two adjacent cabinets, use 6-meter (19.68-foot) copper, or 6-meter AOC, or 20-meter (65.62-foot) AOC SAS-3 cables; only one pair of 6-meter or 20-meter SAS-3 cables is allowed per chain.

• For Oracle Storage Drive Enclosure DE2-24 and Sun Disk Shelf cabling extending between adjacent cabinets, use 3-meter (9.84-foot) SAS-2 cables.

1. Locate the appropriate cabling diagram for your system in Getting Started with Cabling.
2. Starting in the middle of a disk shelf cable, make the appropriate number of loose 12.7-centimeter (5-inch) diameter loops, and attach a cable tie to secure them as shown in the following illustration.

   Use these guidelines for creating the loops:

   • 1-meter cable length - 2 loops

   • 2-meter cable length - 3 loops

   • 3-meter cable length - 4 loops

   The length between the cable tie and the cable ends should be approximately 0.58 meters (23 inches).

   
   
   
3. Facing the rear of the rack and starting with the uppermost disk shelf, hold the cable loops to the side of the rack, choosing the side closest to the disk shelf cabling ports.

   The cable tie should face the rear of the rack to maximize the cable length.

4. Extend the upper end of the cable to the rack rail above the uppermost disk shelf, and ensure that the cable leaves enough clearance to remove the power supply.
5. Connect that cable end to the appropriate port in the uppermost disk shelf.

   Refer to the appropriate cabling diagram to identify the disk shelf port. When attaching a cable to an Oracle Storage Drive Enclosure DEx-24 disk shelf, position the blue release tab correctly for the disk shelf type and I/O Module, and ensure that the cable connector latches engage in the port.

   Attaching a Mini-SAS HD Cable to an Oracle Storage Drive Enclosure DE3-24P Disk Shelf

   
   
   

   1 Blue release tab

   2 Cable connector latches

   3 IOM 0/IOM 1 port latch receiver holes

   Attaching a Mini-SAS HD Cable to an Oracle Storage Drive Enclosure DE3-24C Disk Shelf

   
   
   

   1 Blue release tab

   2 Cable connector latches

   3 IOM 0/IOM 1 port latch receiver holes

   Attaching a Mini-SAS Cable to an Oracle Storage Drive Enclosure DE2-24P Disk Shelf

   
   
   

   1 Blue release tab	4 Blue release tab
   2 Cable connector latches (underneath)	5 Cable connector latches
   3 IOM 1 port latch receiver holes (underneath)	6 IOM 0 port latch receiver holes

   Attaching a Mini-SAS Cable to an Oracle Storage Drive Enclosure DE2-24C Disk Shelf

   
   
   

   1 Blue release tab

   2 Cable connector latches (underneath)

   3 IOM 0/IOM 1 port latch receiver holes (underneath)

6. Slide the coiled cable between the vertical rack rail and the rack side panel, ensuring that the cable tie is still facing the rear of the rack.
7. Verify clearance for power supply removal, and then connect the other end of the cable to the appropriate port in the appropriate disk shelf.
8. Use another cable tie to secure the upper end of the cable to a rack rail mounting hole that is slightly above the uppermost disk shelf.

   Cabling 2U Disk Shelves Together (Oracle Storage Drive Enclosure DE3-24P shown)

   
   
   

   Cabling 2U Disk Shelves Together (Oracle Storage Drive Enclosure DE2-24P shown)

   
   
   

   Cabling 4U Disk Shelves Together (Oracle Storage Drive Enclosure DE3-24C shown)

   
   
   

   Cabling 4U Disk Shelves Together (Oracle Storage Drive Enclosure DE2-24C shown)

   
   
   
9. Repeat this process for the remaining disk shelves in the chain, substituting the correct disk shelves.

   Keep approximately 20.32 centimeters (8 inches) between cable tie-offs on a side.

10. Trim the cable tie excess.
11. Repeat this procedure for any additional disk shelf chains.
12. To connect the controllers to the disk shelf chains, see the appropriate procedure:

    • Cabling Controllers to Disk Shelves in a Base Cabinet

    • Cabling Controllers in a Base Cabinet to Disk Shelves in an Expansion Cabinet