Scsi Bus And Id Settings; Rack And Tower Mode Settings - IBM EXP15 Hardware Maintenance Manual

SCSI bus and ID settings:

drive CRU in the expansion unit, the drive tray plugs into a
printed circuit board called the midplane. The midplane
sets the SCSI bus number and ID automatically, based on
the setting of Option Switch 1 and the physical location
(bay) of the drive CRU.
Your expansion unit supports up to two external SCSI
buses and up to two internal SCSI buses. Each internal
SCSI bus uses five SCSI IDs. When you install the
expansion unit, you can set Option Switch 1 on the ESM
board to create two separate five drive SCSI buses, or you
can leave it set as one, daisy-chained ten drive SCSI bus.
Option Switch 1 set to Off:
With this default setting, all 10 disk drive bays are on
a single SCSI bus. The midplane will assign the
SCSI IDs for the drive bays in ascending order from
left to right (rack mode) or from top to bottom (tower
mode) as follows:
, 1, 2, 3, 4, 8, 9, 1 , 11, 12. The
system-management SCSI accessed fault tolerant
enclosure (SAF-TE) processor uses SCSI ID 15.
When Option Switch 1 is set to the Off position, you
can use either external cable connector.
Option Switch 1 set to On:
When Option Switch 1 is set to the On position, two
independent internal five drive SCSI buses are
created. External SCSI Bus 1 maps to internal SCSI
Bus 1 and external SCSI Bus 2 maps to internal SCSI
Bus 2. The midplane assigns the five internal Bus-1
bays SCSI IDs , 1, 2, 3, and 4; and the five
internal Bus-2 bays SCSI IDs , 1, 2, 3, and 4. On
each SCSI bus, the system-management processor
uses SCSI ID 15.
Important information:
If you are using a ServeRAID software version earlier
than Version 3.50, the View Configuration screens
might show SCSI IDs or bay numbers. If the data
shown on the View Configuration screen begins with
'0', it denotes SCSI IDs. If the data shown on the
View Configuration screen begins with '1', it denotes
bay numbers.

Rack and tower mode settings:

5 on the ESM board is the rack and tower mode switch.
Switch 5 must be in the Off position when the unit is
placed in a rack and in the On position if the unit is placed
in a tower. When shipped, Option Switch 5 is set to the
rack (Off) position.
When Option Switch 5 is in the On position, two changes
to your expansion unit will occur. First, the SCSI ID
Netfinity EXP200 Type 3530
When you install a
Option Switch
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