User's Guide

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This appendix provides an overview of the
Small Computer System
Interface
2
(
SCSI-2
) and gives an overview of how to configure the SCSI
bus.
SCSI
is a standard specification that allows an application running
on a host computer to communicate with peripheral SCSI devices, such
as the library and the enclosed tape drives. The library uses SCSI
commands to receive instructions from the host and to report its status
to the host.
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The SCSI system consists of the following components:
S
Initiator.
The host computer system acts as the initiator of
commands. It consists of the application software, the operating
system, the device driver, and the SCSI adapter card.
S
Bus.
The SCSI cables connected to the adapter card and to the library
(as well as other devices on the bus) provide a pathway (or bus)
for passing commands.
S
Targets.
The library and the tape drives are peripheral devices (or
targets) that are capable of receiving commands from the host. Up to
eight devices (including the host computer) can be connected to the
SCSI bus, in what is referred to as a
daisy chain
.