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Quantum DLT 4000 Tape Drive
3-1
Chapter 3
SCSI DESCRIPTION
This chapter provides a detailed description of the logical interfaces of the tape drive. The drive is
fully compliant with the ANSI SCSI-2 standard for tape drive devices and implements many optional
features.
3.1
SCSI OVERVIEW
The Small Computer System Interface (SCSI) is a specification for a peripheral
bus and command set that is an ANSI standard. The standard defines an I/O
bus that supports up to eight devices (narrow SCSI).
ANSI defines three primary objectives of SCSI-2:
1.
To provide host computers with device-independence within a class of
devices
2.
To be backward-compatible with SCSI-1 devices that support bus parity
and that meet conformance level 2 of SCSI-1
3.
To move device-dependent intelligence to the SCSI-2 devices
Important features of SCSI-2 implementation include the following:
•
Efficient peer-to-peer I/O bus with up to 16 devices
•
Asynchronous transfer rates that depend only on device implementation
and cable length
•
Logical addressing for all data blocks (rather than physical addressing)
•
Multiple initiators and multiple targets
•
Distributed arbitration (bus contention logic)
•
Command set enhancement
3.2
SCSI COMMANDS
ANSI classifies SCSI commands as mandatory, optional, or vendor-specific. The
mandatory and optional commands implemented for the drives are summarized
in Table 3–1 and described fully in Chapter 5,
SCSI Commands
.
Summary of Contents for DLTtape DLT 4000
Page 1: ...DLT 4000 Tape Drive Product Manual November 10 2003 81 60043 04 ...
Page 5: ...USER MANUAL STATEMENTS FOR CLASS B EQUIPMENT continued ...
Page 6: ......
Page 24: ...About This Manual Quantum DLT 4000 Tape Drive xxiv ...
Page 62: ...Hardware Implementation 2 28 Quantum DLT 4000 Tape Drive ...
Page 100: ...Messages 4 12 Quantum DLT 4000 Tape Drive ...
Page 264: ...SCSI Commands 5 164 Quantum DLT 4000 Tape Drive ...
Page 274: ...Appendix B EEPROM Resident Bugcheck and Event Logs B 6 Quantum DLT 4000 Tape System ...
Page 280: ...Appendix C Updating the Firmware C 6 Quantum DLT 4000 Tape Drive ...
Page 298: ...Index Index 6 Quantum DLT4000 Tape Drive ...
Page 299: ......