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3.4.2.4 Connecting Two 7131 Storage Towers to Two Systems
Use the following procedure to connect two 7131 Storage Towers to two systems (Figure 3-12).
Note: This configuration requires a SE/DIFF card and a terminator for each 7131 Storage Tower. A SCSI Y-cable is also required for
each system.
Figure 3-12. Two 7131 Storage Towers Connected to Two Systems
1. DANGER
+--------------------------------------------------------------------+
¦ To prevent a possible electrical shock during an electrical storm, ¦
¦ do not connect or disconnect cables or station protectors for ¦
¦ communications lines, display stations, printers, or telephones. ¦
¦ (RSFTD003) ¦
+--------------------------------------------------------------------+
2. 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) ¦
+--------------------------------------------------------------------+
3. Set the SE/DIFF address jumper on the second 7131 Storage Tower; see "Setting the Address Jumper for a Second 7131 Storage
Tower" in topic 3.2.
4. Connect a tower-to-tower SCSI cable to the lower SCSI connector of the first 7131 Storage Tower.
5. Connect a system SCSI cable to the upper SCSI connector of the first 7131 Storage Tower.
6. Connect a system SCSI cable to the lower SCSI connector of the second 7131 Storage Tower.
7. Connect the tower-to-tower SCSI cable from the first 7131 Storage Tower to the second 7131 Storage Tower (see Figure 3-12).
8. Secure the cables by tightening the screws on the cable connectors.
9. Connect a SCSI cable from each 7131 Storage Tower to one end of each SCSI Y-cable.
10. Secure the cables by tightening the screws on each SCSI cable connector.
11. Connect a SCSI terminator to the remaining end of each SCSI Y-cable.
12. Secure the terminators by tightening the screws on each terminator.
13. Connect a SCSI Y-cable from the first 7131 Storage Tower to the first system, and connect a SCSI Y-cable from the second 7131
Storage Tower to the second system. See your system publications.
14. 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
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