Setting The Interface Options And Id Settings; External Option Switches; Internal Option Switches - IBM Netfinity EXP300 Hardware Maintenance Manual

Type 3531

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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.

Internal

options 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

Option switches 2 through 5 — Reserved

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.

IBM Netfinity EXP300 - Type 3531 Hardware Maintenance Manual

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.

These option switches are reserved; leave these option switches set to the

default positions. Set switches 2 through 5 (On, On, Off, Off) respectively.

External option switches

Unit ID switch

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