1 Interface Implementation

HP Ultrium drives use SCSI-3 as the interface to connect to the host system.

This chapter gives an overview of how the interface operates.

Full details of the messages are given in Chapter 2 and of commands in Chapter 3 and Chapter 4.

The SCSI interface

The Small Computer System Interface (SCSI) is an industry standard, approved by the American National Standards Institute (ANSI). You are recommended to read the ANSI standard document in conjunction with this manual. The ANSI specification defines the interface in general while this document describes the HP Ultrium implementation.

The SCSI implementation provides a drive with a standard set of features and functions. These include the following:

•Synchronous data transfers

•Asynchronous data transfers

•Implementation of all mandatory and most optional commands of the Sequential Access command set

•LVD (Low-Voltage differential) SCSI connection

•Ultra-320 wide SCSI

•Conformance to the following SCSI standards:

•SAM-2 ANSI INCITS.366:2003

•SPI-4 ANSI INCITS.362:2002

•SPC3

•SSC-2 ANSI INCITS.380:2003

Supported messages

The following messages are supported by the drives:

•ABORT

•BUS DEVICE RESET

•COMMAND COMPLETE

The SCSI interface 11

Interface Implementation