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10 IBM Netfinity EXP300 - Type 3531 Hardware Maintenance Manual
Setting the interface options and ID settings
When you install a 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.
The switch card located on the back of the expansion unit has five external option
switches, four internal option switches, and a unit ID switch. It is easier to set these
switches before you install the expansion unit in a rack or tower enclosure.
Attention: Always set the option switches while the expansion unit and host server
are turned off. Failure to do so will result in loss of data.
External option switches
The five option switches on the exterior of the switch card are: Option switch 1
controls the power supply to the expansion unit. Option switches 2 through 5 are
reserved; leave these switches in the default positions.
Option switch 1 — Power-control switch
When this option switch is set to Off, the expansion unit turns on and off
automatically when you turn the host machine on and off. This occurs only if
termination power is present (the termination-power LED is on) at the
external SCSI connector.
When this option switch is set to On (the default), you must turn the
expansion unit on and off separately.
Option switches 2 through 5 — Reserved
These option switches are reserved; leave these option switches set to the
default positions. Set switches 2 through 5 (On, On, Off, Off) respectively.
Internal option switches
The four option switches inside the switch card are: Option switch 1 controls SCSI
addresses for the rack and tower installation modes. Option switch 2 controls the
front panel power and fault LEDs for the rack and tower. Option switch 3 controls the
SCSI bus, and option switch 4 is reserved; leave this switch in the Off position.
0
1
2
3
4
5
6
7
8
9
External option switches
Internal
options switches
Unit ID switch
0
1
2
3
4
5
6
7
8
9
1
2
3
4
On