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Chapter 18. Backup-while-open (BWO)
The BWO facility, together with other system facilities and products, allows you to
take a backup copy of a VSAM data set while it remains open for update.
Many CICS applications depend on their data sets being open for update over a
long period of time. Normally, you cannot take a backup of the data set while the
data set is open. Thus, if a failure occurs that requires forward recovery, all
updates that have been made to the data set since it was opened must be
recovered. This means that you must keep all forward recovery logs that have been
produced since the data set was opened. A heavily used data set that has been
open for update for several days or weeks might need much forward recovery.
Using BWO, only the updates that have been made since the last backup copy was
taken need to be recovered. This could considerably reduce the amount of forward
recovery that is needed.
BWO and concurrent copy
Concurrent copy improves BWO processing by eliminating the invalidation of a
BWO dump because of updates to the data set.
The following is a comparison of various kinds of dumps that you can request:
v Normal dump. Use of the data set must be quiesced so that serialization is
obtained, the data set is dumped, and serialization is released. The data set
cannot be used for the entire time.
v Concurrent copy dump. Use of the data set must be quiesced so that
serialization is obtained, concurrent copy utilization is completed within a very
short time (compared with the actual time to dump the data set), serialization is
released, and the data set is dumped. The data set can be used after concurrent
copy initialization is complete.
v BWO dump. Serialization is attempted but is not required, and the data set is
dumped. If it is eligible for BWO, the data set is dumped without serialization
and can remain in use for the entire time, but the dump can be invalidated by
update activity to the data set.
v BWO dump using concurrent copy. Serialization is attempted but is not
required, concurrent copy initialization is completed, and the data set is
dumped. If it is eligible for BWO, the data set is dumped without serialization
and can remain in use for the entire time, and updates that occur do not cause
the dump to be invalidated.
To use concurrent copy, specify the CONCURRENT keyword when you use
DFSMShsm to dump BWO data sets.
BWO and backups
The BWO function allows backups to be taken by DFSMSdss when applications
are running in continuous operation while the data set is open for update with full
data integrity of copied data.
Continuous operation is typically 24 hours-a-day for five to seven days a week.
This is feasible only for CICS VSAM file control data sets for which CICS creates
© Copyright IBM Corp. 1982, 2010 203
- Recovery and Restart Guide 1
- Contents 5
- Contents v 7
- What this book is about 9
- Who should read this book 9
- How to use this book 9
- Release 1 11
- Logging changes 15
- The role of CICS 16
- Recoverable resources 17
- Emergency restart backout 18
- CICS forward recovery 19
- XCF/MRO partner failures 21
- Units of work 25
- Shunted units of work 25
- Synchronization points 27
- CICS recovery manager 29
- Recovery 30
- CICS system log 33
- System activity keypoints 34
- Forward recovery logs 34
- Normal shutdown processing 37
- First quiesce stage 37
- Second quiesce stage 38
- Third quiesce stage 38
- Warm keypoints 39
- Flushing journal buffers 40
- Uncontrolled termination 42
- Cataloging CICS resources 43
- Global catalog 43
- Local catalog 44
- Warm restart 47
- Emergency restart 47
- Cold start 48
- Dynamic RLS restart 49
- Chapter 4. CICS cold start 57
- Temporary storage 59
- Transient data 59
- Monitoring and statistics 61
- Terminal control resources 61
- Dump table 62
- Chapter 4. CICS cold start 51 63
- Chapter 5. CICS warm restart 65
- Data set name blocks 66
- Transactions 68
- LIBRARY resources 68
- Programs 68
- Start requests 69
- Other backout processing 74
- CICS ARM processing 79
- Registering with ARM 80
- De-registering from ARM 80
- Failing to register 81
- ARM couple data sets 81
- Workload policies 82
- Connecting to VTAM 82
- The COVR transaction 83
- Server ARM processing 83
- Unit of work recovery 85
- Transaction backout 86
- Intrapartition transient data 88
- Auxiliary temporary storage 88
- START requests 88
- EXEC CICS CANCEL requests 90
- Backout-failed recovery 91
- Commit-failed recovery 95
- Indoubt failure recovery 96
- Cache failure support 100
- Lost locks recovery 101
- Transaction abend processing 104
- Exit code 104
- Transaction restart 105
- Terminal error processing 109
- Node error program (DFHZNEP) 109
- End user’s standby procedures 115
- Security 116
- Documentation and test plans 117
- About this task 119
- Defining log streams to MVS 120
- Defining system log streams 120
- Recovery considerations 122
- Activity keypointing 124
- Log-tail deletion 126
- Writing user-recovery data 127
- Long-running transactions 128
- Procedure 128
- What to do next 129
- Defining the log of logs 130
- Log of logs failure 131
- Reading log streams offline 131
- Adjusting local time 132
- Recovery for transactions 135
- Recovery for files 137
- VSAM files 137
- Forward recovery 138
- Backward recovery 138
- BDAM files 141
- The CSD data set 141
- Logical recovery 144
- Physical recovery 144
- Recovery for Web services 148
- Persistent message processing 150
- SAA-compatible applications 155
- Program design 155
- Processing dialogs with users 156
- Main storage areas 157
- CICS recoverable resources 157
- Terminal paging through BMS 160
- Using transient data queues 160
- Transaction failures 161
- HANDLE ABEND commands 162
- Dynamic transaction backout 162
- System failures 163
- START TRANSID commands 165
- Implicit locking for files 166
- Recoverable files 167
- XRCINIT exit 173
- XRCINPT exit 173
- XFCBFAIL global user exit 173
- XFCLDEL global user exit 174
- XFCBOVER global user exit 174
- XFCBOUT global user exit 174
- The CICS-supplied PEP 175
- Your own PEP 176
- Omitting the PEP 177
- Quiescing RLS data sets 179
- INQUIRE DSNAME 187
- INQUIRE UOWDSNFAIL 187
- SHCDS LIST subcommands 188
- CEMT command examples 190
- A special case: lost locks 192
- Overriding retained locks 192
- Post-batch processing 193
- Using the REPRO method 195
- Rebuilding alternate indexes 198
- //SYSIN DD * 200
- SHCDS FRSETRR(old_dsname) 200
- SHCDS FRUNBIND(old_dsname) 200
- Catalog recovery 209
- BWO and concurrent copy 215
- BWO and backups 215
- BWO requirements 216
- Hardware requirements 217
- How you request BWO 218
- Removing BWO attributes 220
- Systems administration 220
- BWO processing 221
- File opening 222
- File closing (non-RLS mode) 224
- Shutdown and restart 225
- Data set backup and restore 225
- VSAM access method services 226
- Forward recovery logging 227
- Chapter 19. Disaster recovery 235
- Disaster recovery testing 236
- Tier 0: no off-site data 237
- Tier 1 - physical removal 237
- Tier 3 - electronic vaulting 239
- Tier 0–3 solutions 240
- Tier 0 - 3 241
- 37453745 242
- Tier 4–6 solutions 245
- PPRC or XRC? 247
- Remote Recovery Data Facility 248
- Disaster recovery facilities 250
- Final summary 252
- Part 4. Appendixes 253
- Trademarks 256
- Bibliography 257
- Other CICS publications 258
- Accessibility 259
- SC34-7012-01 266
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