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Table 8–12: MUC Switch Functions (cont.)
Switch
Function
7
Host selection: Down for SCSI, up for serial
a
8
Must be down, reserved for testing
a
For a TruCluster Server cluster, switch 7 is down, allowing switches 1, 2, and 3 to select the MUC SCSI ID.
8.11.3 Setting the MUC SCSI ID
The multi-unit controller (MUC) SCSI ID is set with switch 1, 2, and 3, as
shown in Table 8–13. Note that switch 7 must be down to select the SCSI
bus and enable switches 1, 2, and 3 to select the MUC SCSI ID.
Table 8–13: MUC SCSI ID Selection
MUC SCSI ID SW1 SW2 SW3
0
Down Down Down
1
Up Down Down
2
Down Up Down
a
3
Up Up Down
4
Down Down Up
5
Up Down Up
6
Down Up Up
7
Up Up Up
a
This is the default MUC SCSI ID.
8.11.4 Tape Drive SCSI IDs
Each tape library arrives with default SCSI ID selections. The TL893 is
shown in Table 8–14. The TL896 is shown in Table 8–15.
If you must modify the tape drive SCSI IDs, use the push-button up-down
counters on the rear of the drive to change the SCSI ID.
Table 8–14: TL893 Default SCSI IDs
SCSI Port
Device
Default SCSI ID
MUC
2
C
Drive 2 (top)
5
B Drive 1 (middle)
4
A Drive 0 (bottom)
3
Configuring a Shared SCSI Bus for Tape Drive Use 8–51