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Chained
Description
One or more source machines sends replicated data to a target machine that in turn acts as a source
machine and sends selected data to a final target machine which is often offsite.
Applications
This is a convenient approach for integrating local high availability with offsite disaster recovery. This
configuration moves the processing burden of WAN communications from the source machine to the
target/source machine.
Considerations
The target/source machine could become a single point of failure for offsite data protection.
Source Machine Target and Source Target Machine
Machine
- HP StorageWorks Storage 1
- Mirroring for Linux 1
- User’s Guide 1
- Table of Contents 3
- Intended Audience 9
- Organization of This Guide 9
- Online References 10
- Storage Mirroring Features 12
- Storage Mirroring Operations 13
- Replication 14
- Failure monitoring/failover 15
- Restoration 16
- Sample Configurations 17
- One-to-One, Active/Active 18
- Many-to-One 19
- One-to-Many 20
- Description 21
- Applications 21
- Considerations 21
- Single Machine 22
- 2 X Management Console 23
- Understanding the Display 24
- Management Console toolbar 26
- Stopping the daemon 27
- Storage Mirroring Ports 28
- Inserting a Server 30
- Storage Mirroring Workspaces 31
- 3 X Text Clients 32
- The Command Line Client 33
- Stopping the Daemon 35
- Exiting the Text Clients 40
- Failover Control Center 41
- “Failed Over” 44
- 5 X Replication Sets 46
- Multi-Client Access 47
- Replication Set Operations 48
- How Replication Sets Work 48
- Creating a replication set 49
- Modifying a replication set 53
- Deleting a replication set 53
- 6 X Connections 62
- Connection Options 63
- Throughput Diagnostic Utility 64
- Connection IDs 64
- Establishing a new connection 67
- Disconnecting a connection 68
- Monitoring a connection 69
- Connection display 70
- Configuring queuing 71
- Configuring auto-reconnect 72
- 7 X Mirroring 79
- Orphan Files 81
- Auto-Remirror 82
- How Mirroring Works 83
- Controlling a mirror manually 85
- Monitoring a mirror 86
- Configuring orphan files 87
- Setting auto-remirror 88
- Mirror Pause 92
- Mirror Resume 92
- 8 X Replication 97
- Processing task commands 100
- Replication Start 103
- Replication Stop 103
- Monitoring replication 104
- 9 X Verification 108
- Verification Log 110
- How Verification Works 111
- Verification log 114
- Monitoring verification 115
- Initiating verification 116
- 10 X Data Transmission 120
- Setting bandwidth limitations 123
- Setting a transmission window 126
- 11 X Failover 135
- Failover Terminology 136
- How Failover Works 136
- How Failback Works 137
- How Failure Detection Works 138
- Client Connectivity 138
- Failover Options on 139
- Failover Options 141
- Monitoring failover 145
- Initiating failback 146
- Communication ports 148
- Testing failover 149
- Failover manual intervention 149
- 12 X Restoration 159
- Conditionals 160
- Restoration Options 161
- Automating Restore 167
- 13 X Monitoring Tools 169
- Management Console Statistics 170
- Customizing the statistics 172
- At-a-Glance Monitoring 173
- The target is not loaded 175
- The target is busy 175
- Text Client main window 179
- DTCL status command 180
- Linux System Log 181
- DTStat log file 191
- Running DTStat 194
- DTStat statistics 196
- LogViewer 200
- LogViewer log file 201
- Viewing the log files 203
- LogViewer Messages 204
- Advanced Settings 208
- Setup options 210
- Network options 211
- Queue options 212
- Source options 213
- Target options 214
- Database options 215
- Logging options 216
- 15 X Security 235
- Click OK 236
- Conventions 237
- Storage Mirroring Commands 237
- Connect 238
- Connect TDU 239
- Disconnect 239
- Environment 241
- Failback 241
- Failover 242
- Get Local 242
- GetEnvStr 243
- Limit Bandwidth 243
- Load Source 244
- Load Target 244
- Mirror Pause 246
- Mirror Resume 246
- Mirror Start 247
- Mirror Stop 247
- Monitor Clear 248
- Monitor Create 248
- Monitor Delete 248
- Monitor Display 249
- Monitor Get 249
- Monitor List 249
- Monitor Move 250
- Monitor Option 251
- Monitor Remove 252
- Monitor Script Add 252
- Monitor Script Remove 253
- Monitor Start 253
- Monitor Stop 254
- Monitor Use 254
- Orphans Start 255
- Orphans Stop 255
- Pause Target 255
- Queue Task 256
- Replication Start 258
- Replication Stop 258
- Repset Calculate 258
- Repset Create 259
- Repset Delete 259
- Repset Display 259
- Repset List 260
- Repset Resync 260
- Repset Rule Add 260
- Repset Rule Remove 261
- Repset Save 261
- Repset Use 261
- Resume Target 263
- Schedule Clear 263
- Schedule Disable 263
- Schedule Enable 264
- Schedule End 264
- Schedule Start 265
- Schedule Window 265
- Set Local 266
- Shutdown 267
- Statslog Start 267
- Statslog Status 268
- Statslog Stop 268
- Transmission Pause 270
- Transmission Resume 270
- Transmission Start 270
- Transmission Stop 270
- Unload Source 271
- Unload Target 271
- Wait on Mirror 273
- Wait on Restore 273
- Wait on Target 273
- WRITE $<variable_name> 274
- DTCL Scripting 275
- DTCL Return Values 276
- DTCL Scripting Examples 279
- Basic flow control script 280
- B X Glossary 281
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