IBM Netfinity EXP300, Инструкция по установке и эксплуатации

Страница: 24 / 72

12
IBM® Netfinity® EXP300 Installation and User’s Guide
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. See “Turning the expansion
unit on and off” on page 21.
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.
Attention: A loss of data can occur if you change the position of internal option
switch 1 or internal option switch 3 after storing data on the drives. Please contact the
IBM HelpCenter for assistance if you want to change the configuration of your
expansion unit from a rack (internal switch 1 Off) to a tower (internal switch 1 On) or
from a tower to a rack orientation. If you want to change the configuration of your
expansion unit from a single-bus (internal option switch 3 Off) to a dual-bus (internal
option switch 3 On) or from a dual-bus to a single-bus. See “Getting help, service, and
information” on page 37 for more information.
0
1
2
3 4
5
6
78 9
External option switches
Internal
options switches
Unit ID switch
0
1
2 3 4
5
6
78
9
1
2
3
4
On