Shared Scsi Buses With Tl894 In Two-Bus Mode - Compaq TruCluster Server AA-RHGWB-TE Manual

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
Memory
Member System 1 Channel
Interface
Memory Channel
6
KZPBA-CB (ID 6)
T
KZPBA-CB (ID 6)
T
KZPBA-CB (ID 6)
1 1
T
DS-DWZZH-03
T
T
2 3
T
4
Controller B Controller A
HSZ70 HSZ70
StorageWorks
RAID Array 7000
NOTE: This drawing is not to scale.
Network
Member System 2
Memory Channel
T
KZPBA-CB (ID 7)
5
KZPBA-CB (ID 7)
5
T
KZPBA-CB (ID 7)
7
7
(2-bus mode)
SCSI Port 4
SCSI Port 3
SCSI Port 2
SCSI Port 1
TL894
Configuring a Shared SCSI Bus for Tape Drive Use 8–35
7
7
5
5
ZK-1625U-AI