Compaq AA-RHGWB-TE manual Shared Scsi Buses with TL894 in Two-Bus Mode

Figure 8–12 shows a sample TruCluster Server cluster using a TL894 tape library. In the sample configuration, the tape library has been connected in the two-bus mode by jumpering tape drive 0 to tape drive 1 and tape drive 2 to tape drive 3 (See Section 8.8.3 and Figure 8–11). The two SCSI buses are left at the default SCSI IDs and terminated at drives 1 and 3 with the installed terminators (part number 0415619).

To add a TL894 to a shared SCSI bus, select the member system or storage device that will be the next to last device on the shared SCSI bus. Connect a BN21K or BN21L cable between the Y cable on that device to the appropriate tape library port. In Figure 8–12, one bus is connected to port 1 (robotics controller and tape drives 0 and 1) and the other bus is connected to port

3 (tape drives 2 and 3). Ensure that the terminators are present on the tape drives 1 and 3.

Figure 8–12: Shared SCSI Buses with TL894 in Two-Bus Mode

Network

Member System 1

Memory Channel

KZPBA-CB (ID 6)

KZPBA-CB (ID 6)

T KZPBA-CB (ID 6)

11

T

Memory

Channel Member System 2

Interface

	T	Memory Channel
6
T	5	KZPBA-CB (ID 7)

5 KZPBA-CB (ID 7)

T KZPBA-CB (ID 7)

7

7

7

57

5

T DS-DWZZH-03

T

2 3

T 4

Controller B	Controller A
HSZ70	HSZ70

StorageWorks

RAID Array 7000

(2-bus mode)

SCSI Port 4

SCSI Port 3

SCSI Port 2

SCSI Port 1

TL894

NOTE: This drawing is not to scale.

ZK-1625U-AI

Configuring a Shared SCSI Bus for Tape Drive Use 8–35