SCSI BUS

Host

system A

Host

system B

Figure 7.1 Example of SCSI configuration

A unique device address (SCSI ID: #n in Figure 7.1) is assigned to each SCSI device. Input-output devices connected to or under an SCSI device operating as a target are accessed in logical units. A unique device address (LUN: logical unit number) is assigned to each logical unit.

An initiator specifies an SCSI ID to select an SCSI device operating as a target, then specifies an LUN to select the input-output device connected to or under the target.

An optical disk drive is constructed with all volumes as a single logical unit. Specificable SCSI IDs and LUN are as follows:

SCSI ID: #0 to #7 selectable (setting terminal or external input)

LUN: #0 (fixed)

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Fujitsu MCP3064SS, MCM3064SS, MCP3130SS, MCM3130SS manual Example of Scsi configuration