Archive PYTHON 4322 Data Compression Manuals

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Archive PYTHON 4322 Product Description Manual (131 pages)

DDS-DC DATA COMPRESSION DAT TAPE DRIVES, 3.50/5.25-lnch, Internal Tape Drive, External Subsystem

Brand: Archive | Category: Storage | Size: 4 MB

Table of Contents
4
Preface
9
Chapter 1. Introduction

10
- Overview
  10
- Software
  19
- About this Manual
  20
- Table 1-2. Chapter Descriptions
  20
Chapter 2. Specifications

22
Chapter 3. Installation

30
Chapter 4. Drive Operation

48
Chapter 6. Tape Formats

68
- Introduction
  68
  - DDS Format
    68
  - DDS-DC Format
    69
  - Commonalities between the Formats
    69
- Entities (DDS-DC Format Only)
  70
- Tape Layout
  71
- Single Data Space Layout
  71
  - Device Area
    72
  - Reference and System Area
    72
  - Figure 6-1 Single Data Space Tape Layout
    72
  - Figure 6-2 Reference and System Area Layout
    73
  - Data Area
    74
  - End-Of-Data (EOD) Area
    74
- Two-Partition Layout
  74
- Data Storage Organization
  75
- Figure 6-3 Two-Partition Tape Layout
  75
- Individual Track Layout
  76
  - Main Area
    76
  - Figure 6-4 Individual Track Layout
    76
  - Subareas
    77
- Group Structure
  78
  - Figure 6-5 Group Structure
    78
  - Data Frames
    79
  - ECC Frame
    79
  - Index
    79
  - Amble Frames
    80
- Indexing
  80
  - Group Information Table (GIT)
    80
  - Block Access Table (BAT)
    81
- Vendor Group
  82
- Read-After,Write
  83
Chapter 7. Data Compression

84
- Introduction
  84
  - Data Compression Considerations
    84
  - DCLZ Algorithm
    85
  - Hardware Compression
    86
  - Data Integrity
    86
  - DCLZ Algorithm
    86
    
    Simplified Compression Operation
    87
    
    Table 7-1. Simplified Compression
    87
    
    Dictionary
    88
    
    Simplified Decompression Operation
    89
    
    Table 7-2. Simplified Decompression
    89
  - AHA3101 Data Compression Chip
    90
Chapter 8. Theory of Operation

92
- Block Diagrams
  93
- Python DDS-DC DAT Drives
  93
Chapter 9. Maintenance and Reliability

106
- Maintenance
  106
- Reliability
  108
  - Mean-Time-Between-Failure
    108
  - Mean-Time-To-Repair
    108
  - Table 9-1. Reliability Specifications
    108
Appendix Aglossary of Terms

110
Appendix B. Acronyms and Measurements

114
- Measurements
  116
Appendix Cdata Compression

118
- Introduction
  118
- MODE SELECT Page
  118
- Table C-1. Data Compression MODE SELECT Page
  118
  - Compression Control
    119
  - Decompression Control
    119
- Table C-2. DDE and RED Bit Configurations
  120
  - MODE SENSE Page
    121
- Table C-3. Algorithms
  121
- Table C-4. Data Compression MODE SENSE Page
  121
  - Compression Control
    122
  - Decompression Control
    122
  - Compression Algorithm
    123
  - Decompression Algorithm
    123
  - Request Sense Data
    123
  - Implementation Notes
    124
- Table C-6. Sense Data Values and Descriptions
  124
  - C.S.2 SCSI Command Operation for Noncompressing Modes
    125
  - WRITE DATA BUFFER (3Bh)
    127
    
    C.6.L WRITE DATA BUFFER Command Descriptor Block
    127
- Table C-7. Command Descriptor Block: WRITE DATA BUFFER
  127
  - Command Descriptor Block Field Descriptions
    128
  - WRITE DATA BUFFER Data Header
    128
- Table C-8. Field Descriptions: WRITE DATA BUFFER Command Descriptor Block
  128
  - Completion Status
    129

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Archive PYTHON 4322 Data Compression Manuals

Archive PYTHON 4322 Product Description Manual (131 pages)

Table of Contents

Chapter 1. Introduction

Chapter 2. Specifications

Chapter 3. Installation

Chapter 4. Drive Operation

Chapter 6. Tape Formats

Chapter 7. Data Compression

Chapter 8. Theory of Operation

Chapter 9. Maintenance and Reliability

Appendix Aglossary of Terms

Appendix B. Acronyms and Measurements

Appendix Cdata Compression

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