Dynamic Tape Accelerator^tm

Contents

Chapter 1
1	Method of Operation
1.1	Components
1.2	Theory of Operation
1.2.1	A Simple Example
1.2.1.1	Uncontrolled Flow
1.2.1.2	Controlled Flow
1.2.2	DTA Controls the Flow of Data
Chapter 2
2	Getting Started
2.1	Required SYSGEN Parameter Changes
2.1.1	SYSGEN Parameter Values
2.2	Changing SYSGEN Parameter Values
Chapter 3
3	Installing DTA
3.1	License Registration
3.2	Install Instructions
Chapter 4
4	DTA Commands
4.1	Command Overview
4.2	Pre-accelerating a Device
4.3	Accelerating a Device
4.3.1	Capacities for Special Devices
4.4	Deaccelerating a Device
Chapter 5
5	Data Compression
5.1	Command Overview
5.2	Enabling Data Compression
5.3	Reading Compressed Tapes
5.4	Turning Data Compression Off
5.4.1	Using ACCEL to Turn Off Data Compression
5.4.2	Using DEACCEL to Turn Off Data Compression
Chapter 6
6	DTA Monitor
6.1	Monitoring Tape Acceleration Activity
6.2	Recording the DTA Monitor
6.3	The Monitor Display
Chapter 7
7	DTA and OpenVMS BACKUP
7.1	Effects of DTA on OpenVMS BACKUP
7.2	Recommended OpenVMS BACKUP Qualifiers
7.2.1	Tape Devices with Hardware CRC and ECC
7.2.2	Tape Devices with Minimal Error Correction
Chapter 8
8	Shutting Down DTA
8.1	Shutdown Instructions
Appendix A
Appendix A	An Installation Example
Appendix B
Appendix B	An Example of Changing SYSGEN Parameters
Appendix C
Appendix C	Resources Used by DTA
Appendix D
Appendix D	Privileges
Appendix E
Appendix E	Maximum Data Transfer Rates for Tape Devices
Appendix F
Appendix F	Magtape Hardware-Level Error Detection and Correction
F.1	DEC 1600 Bpi Tape Drives (PE)
F.2	DEC 6250 Bpi Tape Drives (GCR)
F.3	DEC TK50/70 Tape Systems
Appendix G
Appendix G	OpenVMS BACKUP Authorization Parameters
G.1	OpenVMS 5.2 BACKUP
Appendix H
Appendix H	Using Dynamic Tape Accelerator with Remote Device Facilitytm
H.1	ACCELERATING Remote Tape Devices
H.2	DEACCELERATING an RDALLOCATED DEVICE
H.3	PREACCELERATING an RDALLOCATED Device
H.4	The DTA Tape MONITOR
Appendix I
Appendix I	Answers to Commonly Asked Questions
Appendix J
Appendix J	User Notes
Index
Index
Examples
1-1	Dynamic Tape Accelerator Flow Diagram
6-1	DTA MONITOR Sample Display
A-1	Installing Dynamic Tape Accelerator
B-1	Changing SYSGEN Parameters
H-1	DTA MONITOR Sample Display
Tables
1-1	DTA Components
2-1	SYSGEN Parameter Changes
2-2	SYSGEN Parameter Changes
4-1	Capacity in MB for Special Devices
4-2	Capacity in MB for 9-Track Tape Devices
1	E Maximum Tape Drive Data Transfer Rates
1	G Minimum Recommended AUTHORIZATION Parameter Values