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Hodnocené. / 5. Na základě hodnocení zákazníků
Tape File Concepts
DSM/Tape Catalog User’s Guide — 520233-008
2 - 4
Relative Generations
Example
This example shows four generations of CALIF_ACCOUNTS in a file catalog as of
January 27:
On January 27, a special report is needed from the data in the second generation of
CALIF_ACCOUNTS on tape X00025. This DEFINE is used to retrieve that generation:
6> ADD DEFINE =REPORT_IN, CLASS TAPECATALOG,&
6> & USE IN,&
6> & FILEID CALIF_ACCOUNTS,&
6> & GEN -3
On January 28, the catalog entry for the second generation of CALIF_ACCOUNTS is
deleted using the DELETE TAPEFILE command because the tape was destroyed. The
catalog entries and their generations numbers are now:
There is a numbering gap between absolute generation 1 and 3, but the relative
generation numbers have no gap. A t
ape file request by absolute generation number is
possible for generations 1, 3, and 4 only.
You can still request each entry by a relative generation number but asking for relative
generation -3 on January 28 now retrieves CALIF_ACCOUNT
S on tape X00015.
Requesting generation -3 on the previous day would have retrieved
CALIF_ACCOUNTS on tape X00025.
Tape File Name Tape Name
Absolute
Generation
Relative
Generation Date Created
CALIF_ACCOUNTS X00015 1 -4 January 6
CALIF_ACCOUNTS X00025 2 -3 January 13
CALIF_ACCOUNTS X00032 3 -2 January 20
CALIF_ACCOUNTS X00045 4 -1 January 27
Tape File Name Tape Name
Absolute
Generation
Relative
Generation Date Created
CALIF_ACCOUNTS X00015 1 -3 January 6
CALIF_ACCOUNTS X00032 3 -2 January 20
CALIF_ACCOUNTS X00045 4 -1 January 27
- DSM/Tape Catalog 1
- User’s Guide 1
- Document History 2
- Legal Notices 3
- DSM/Tape Catalog User’s Guide 5
- 2. Tape File Concepts 6
- 3. DSM/TC Tape Processing 6
- 4. Role-based flexibility 6
- 5. Configuring DSM/TC 6
- Library Control Path 8
- 9. Database Design of DSM/TC 9
- Contents 10
- What’s New in This Manual 11
- Changes in the H06.13 RVU: 12
- Changes in the G06.23 Manual 12
- About This Manual 13
- Related Publications 14
- Notation Conventions 14
- General Syntax Notation 15
- Notation for Messages 17
- Change Bar Notation 19
- 1 Introduction to DSM/TC 21
- Main Components of DSM/TC 22
- TAPECOM Users 23
- Volume Catalog 23
- Status Changes 24
- Multiple Volume Catalogs 25
- Tape Pools 26
- Append Capable Pools 27
- Tape Volumes 28
- SCRATCH media selection 29
- Tape Files 30
- Disk Files 30
- File Catalog 30
- Introduction to DSM/TC 31
- The CLASS TAPECATALOG DEFINE 32
- Multiple File Catalogs 32
- Volume-Mode Backup 34
- File-Mode Backup 35
- The BACKCOPY Utility 35
- DSM/TC System Terms 36
- System Search Space 37
- Current Default Node 37
- 2 Tape File Concepts 41
- Tape File Concepts 42
- File Generations 42
- Absolute Generations 43
- Relative Generations 43
- Tape File Version 45
- File Retention Period 46
- MASTER_OUT 1 0 Valid 49
- MASTER_OUT 2 0 Valid 49
- MASTER_OUT 3 0 Invalid 49
- MASTER_OUT 3 1 Valid 49
- Tape File Expiration 50
- SQL Warning Message 6008 51
- 3 DSM/TC Tape Processing 53
- Labeled Tapes 54
- Volume Set 54
- DSM/TC Tape Processing 55
- Copies of TMF Tape Volumes 61
- DSM/TC Interaction With $ZSVR 62
- Premounted Output Tapes 65
- Substituting Scratch Tapes 66
- Using VOLUME (Tape Name) 67
- 4 Role-based flexibility 71
- Troubleshooting 72
- Role-based flexibility 73
- 5 Configuring DSM/TC 75
- Task 4. Start $ZSVR 76
- (MEDIADBM) 77
- Creating Volume Catalogs 78
- Creating Pools 79
- MEDIACOM 80
- Default File Catalog 81
- Default Volume Catalog 81
- Default Pool 81
- Default Retention 81
- The Expiration Process 82
- Monitoring the System Date 82
- Default Abend Retention 83
- System Search List 83
- Data Compression 83
- Configuring DSM/TC 84
- Default NL and BLP Behavior 86
- Adding Preexisting Tape Files 90
- Using TAPECATALOG DEFINE 93
- EXPIRATION { mmmddyyyy } 97
- { ddm 97
- TAPECATALOG DEFINE Examples 104
- Labels OMITTED 105
- Labels BYPASS 105
- General Examples 106
- Tape Library Control Path 109
- Configuration Guidelines 109
- Scratch Tapes 110
- Configuring Compression 112
- Tape Library 113
- Automatic Operation 115
- Mount Requests 115
- Control Path Flow Description 115
- Related Reading 118
- Using Tapes in a Tape Library 119
- TAPECATALOG DEFINE Requests 120
- (With Catalog) 121
- Catalog) 122
- User Request Operations 123
- TMF Operations 123
- Run-Time Configuration 126
- Environment Variables 126
- Startup Sequence 127
- Running the Portmapper 128
- Examples 129
- Considerations 129
- Using the RPCINFO Utility 130
- Tape Library Error Diagnosis 132
- Nonretryable Errors 133
- Control Path 134
- 9 Database Design of DSM/TC 135
- Restoring Disk Files 136
- Updating the DSM/TC Database 136
- The Catalog Manager Process 136
- Database Design of DSM/TC 137
- Guidelines 138
- TapefileConfig Table 139
- Applicable Access Key 139
- Tapefile Table 140
- Applicable Access Keys 141
- Tapefile-to-Volume Table 141
- Diskfile Table 142
- Diskfile-to-Volume Table 144
- Pool Table 145
- Volume Table 146
- Volume-to-FileCatalog Table 147
- Shorthand Views 148
- Setting the System Defaults 151
- Creating the Default Catalogs 152
- Adding Pools 153
- Labeling New Tapes 154
- Performing Operational Tasks 155
- BACKUP Information Output 162
- Recovering a Subvolume 165
- Rejecting a Tape Mount 166
- CLASS TAPECATALOG DEFINE 169
- Syntax Summary 169
- VERSION { version 170
- Consistency Checks 171
- CLASS TAPE DEFINE to CLASS 173
- TAPECATALOG DEFINE Conversion 173
- DEFINE Conversion 174
- CLASS TAPE/TAPECATALOG 175
- DEFINE Equivalent Attributes 175
- Attributes 176
- Index - 1 177
- Index - 2 178
- Index - 3 179
- Index - 4 180
- Index - 5 181
- Special Characters 182
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