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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
KZPBA-CB (ID 7)
Memory
Channel
Interface
Memory Channel
KZPBA-CB (ID 6)
Member System 1
DS-DWZZH-03
T
T
T
2
1
4
1
3
StorageWorks
RAID Array 7000
HSZ70HSZ70
Controller B Controller A
T
KZPBA-CB (ID 7)
5
5
6
7
7
KZPBA-CB (ID 6)
T
T
Network
T
NOTE: This drawing is not to scale.
Member System 2
Memory Channel
KZPBA-CB (ID 6)
KZPBA-CB (ID 7)
T
5
TL894
SCSI Port 4
SCSI Port 3
SCSI Port 2
SCSI Port 1
(2-bus mode)
5
7
7
ZK-1625U-AI
Configuring a Shared SCSI Bus for Tape Drive Use 8–35