5.2.3.4 Connecting Two 7131 Storage Towers to Two Systems
Connect two 7131 Storage Towers to two systems (Figure 5-16).
Note: This configuration requires an SE/DIFF card and a terminator for each 7131 Storage Tower. A SCSI Y-cable is also required for
each system.
Figure 5-16. Two 7131 Storage Towers Connected to Two Systems
1. DANGER
+--------------------------------------------------------------------+
¦ To prevent a possible electrical shock from touching two surfaces ¦
¦ with different electrical grounds, use one hand, when possible, to ¦
¦ connect or disconnect signal cables. (RSFTD004) ¦
+--------------------------------------------------------------------+
2. If you link two 7131 Storage Towers in a two system configuration, you can install a total of 12 devices (6 devices in each 7131 Storage
Tower).
3. Use addresses 0 to 5 on the first 7131 Storage Tower; do not use Address 6 (see Figure 5-2 in topic 5.2.1).
4. Use addresses 8 to 13 on the second 7131 Storage Tower; do not use Address 14. (see Figure 5-2 in topic 5.2.1).
5. Set the address on SE/DIFF card in the second 7131 Storage Tower; see Figure 5-14 in topic 5.2.3.3.
6. Set the second system adapter to address (I.D.) 6.
7. Connect the tower-to-tower SCSI cable to the first 7131 Storage Tower, in the lower SCSI connector (see Figure 5-16).
8. Connect the system SCSI cable to the first 7131 Storage Tower, in the upper SCSI connector (see Figure 5-16).
9. Connect a system SCSI cable to the second 7131 Storage Tower in the lower SCSI connector (see Figure 5-16).
10. Connect the SCSI tower-to-tower cable from the first 7131 Storage Tower to the second 7131 Storage Tower.
11. Connect the SCSI cables to one end of each SCSI Y-cable.
12. Secure the cables by tightening the screws on each SCSI cable connector.
13. Connect a SCSI terminator to the remaining end of each SCSI Y-cable.
14. Secure the terminators by tightening the screws on each terminator.
15. Connect the SCSI Y-cables to the systems; refer to your system publications
16. Secure the cables by tightening the screws on each SCSI Y-cable connector.
7131-105 User's Guide
Connecting Two 7131 Storage Towers to Two Systems
¦ Copyright IBM Corp. 1995, 1996
5.2.3.4 - 1
