IBM 5000 manual Scsi Jumpers, Dasd Scsi, Tower Addressing, Backplane Option Jumper Block

SCSI Jumpers

The

option

jumper

block on

the

DASD

(SCSI)

backplane

defines

the SCSI I

hot-swap drives.

See

the

illustration

in

“DASD Backplane Jumper

Block

Loc

on

page 174

for

the

location

of the

option

jumper

block.

Table 19 summarizes the settings for

the

DASD

backplane SCSI

option

jump

block

(J4).

Table

19.

Backplane Option Jumper Block

PinsDescription

1-2 (A0) Removing the jumper from these two pins reverses the SCSI IDs on backplane. For the tower model, these two pins are jumpered; for model, the jumper usually is removed.

3-4 (A1) Reserved. No jumper.

5-6 (A2) These pins are always jumpered.

Tower Addressing	Rack (Reversed)
	Addressing

A2

A1

A0

A2

J4 A1 J4

A0

Table 20 shows the SCSI IDs that you can use for hot-swap drives.

Table

20. SCSI IDs for Hot-Swap Drives

J4 Pins 1-2 (A0)

Bay

1

Bay

2

Bay

3

Bay

4

Bay 5

Jumpered

(tower

0

1

2

3

4

orientation)

Jumper

removed,

DASD

4

3

2

1

0

enclosure

not rotated

Jumper

removed,

DASD

0

1

2

3

4

enclosure

rotated for

rack

orientation

Notes:

When the

DASD

enclosure

on a

tower

model has

been

rotated for rack-mount orie

and the

jumper

has

been

removed,

the bays

correspond

to

the rack model illustration

Chapter 7. Server Records and Specifications173