SCSI Jumpers

SCSI Jumpers

The option jumper block on the DASD (SCSI) backplane defines the SCSI IDs for hot-swap drives. See the (below) illustration in 'DASD Backplane Jumper Block Location', for the location of the option jumper block.

The following table summarizes the settings for the DASD backplane SCSI option jumper block (J4).

Table 8. Backplane Option Jumper Block 

Pins Description
1-2 (A0) Removing the jumper from these two pins reverses
the SCSI IDs on the backplane. For the tower model,
these two pins are jumpered, for the rack model,
the jumper usually is removed.
3-4 (A1) Reserved. No jumper.
5-6 (A2) These pins are always jumpered.


The following table shows the SCSI IDs that you can use for hot-swap drives.

Table 9. SCSI IDs for Hot-Swap Drives. 

J4 Pins 1-2 (A0) Bay 1 Bay 2 Bay 3 Bay 4 Bay 5
Jumpered (tower orientation) 0 1 2 3 4
Jumper removed, DASD enclosure
not rotated.
4 3 2 1 0
Jumper removed, DASD enclosure
rotated for rack orientation.
0 1 2 3 4

Notes: When the DASD enclosure on a tower model has been rotated for rack-mount orientation and the jumper has been removed, the bays correspond to the rack model illustration.

DASD Backplane Jumper Block Location: The following illustration shows the location of the DASD backplane SCSI option jumper block (J4).


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