Compaq AA-RHGWB-TE manual 3 TL894 Tape Library Internal Cabling

14.Press and release the up or down button and the SELECT button simultaneously and verify that System On-line or System Off-line is displayed in the SDA.

8.8.3TL894 Tape Library Internal Cabling

The default internal cabling configuration for the TL894 tape library has the robotics controller and top drive (drive 0) on SCSI bus port 1. Drive 1 is on SCSI bus port 2, drive 2 is on SCSI port 3, and drive 3 is on SCSI bus port 4. A terminator (part number 0415619) is connected to each of the drives to provide termination at that end of the SCSI bus.

This configuration, called the four-bus configuration, is shown in

Figure 8–11. In this configuration, each of the tape drives, except SCSI bus drive 0 and the robotics controller, requires a SCSI address on a separate SCSI bus. The robotics controller and drive 0 use two SCSI IDs on their SCSI bus.

Figure 8–11: TL894 Tape Library Four-Bus Configuration

Tape Drive 0 *SCSI Address 2

Tape Drive 1 *SCSI Address 3

Tape Drive 2 *SCSI Address 4

Tape Drive 3 *SCSI Address 5

Tape Drive Interface PWA

Internal SCSI Termination #1

Internal SCSI Termination #2

Internal SCSI Termination #3

Robotics Controller

*SCSI Address 0

SCSI Cable 1.5m

	Rear Panel
	Host
	Connection #4
SCSI Port 4	Rear Panel
	Host
	Connection #3
SCSI Port 3	Rear Panel
	Host
	Connection #2

SCSI Port 2

Internal SCSI Termination #4

SCSI Cable 3m

Rear Panel

Host

Connection #1

SCSI Port 1

* - Indicates the "default" SCSI ID of the installed devices

ZK-1324U-AI

You can reconfigure the tape drives and robotics controller in a two-bus configuration by using the SCSI jumper cable (part number 6210567) supplied in the accessories kit shipped with each TL894 unit. Remove the terminator from one drive and remove the internal SCSI cable from the

Configuring a Shared SCSI Bus for Tape Drive Use 8–33