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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
- Storage Mirroring 1
- Fourth Edition (May 2004) 2
- Part Number: 360226-002 2
- Table of Contents 3
- Intended Audience 10
- Organization of This Guide 10
- Online References 11
- Storage Mirroring Features 13
- Storage Mirroring Operations 14
- Replication 15
- Failure monitoring/failover 16
- Restoration 17
- Sample Configurations 18
- One-to-One, Active/Active 19
- Many-to-One 20
- One-to-Many 21
- Description 22
- Applications 22
- Considerations 22
- Single Machine 23
- Management Console 24
- Understanding the Display 25
- Management Console toolbar 27
- Stopping the Service 29
- Storage Mirroring Ports 29
- Inserting a Server 31
- Storage Mirroring Workspaces 32
- The Text Client 33
- The Command Line Client 34
- Exiting the Text Clients 41
- Failover Control Center 42
- “Failed 45
- Over” message 45
- Communication Ports 46
- Replication Set Rules 47
- Replication Set Operations 48
- How Replication Sets Work 49
- Multi-Client Access 49
- Replication Capabilities 50
- Creating a replication set 51
- Modifying a replication set 55
- Deleting a replication set 55
- Connections 64
- Connection Options 65
- Throughput Diagnostic Utility 66
- Connection IDs 66
- Connection Resources 66
- Establishing a new connection 70
- Disconnecting a connection 71
- Monitoring a connection 72
- Connection display 73
- Configuring queuing 74
- Configuring auto-reconnect 75
- Mirroring Options 82
- Orphan Files 84
- Auto-Remirror 85
- How Mirroring Works 86
- Controlling a mirror manually 88
- Monitoring a mirror 89
- Configuring orphan files 90
- Setting auto-remirror 91
- ! Mirror Pause 95
- ! Mirror Resume 95
- Replication Options 100
- How Replication Works 100
- Recovery From Network Losses 101
- Windows Permissions 101
- Task Command Processing 101
- Monitoring replication 103
- Processing task commands 105
- ! Replication Start 108
- ! Replication Stop 108
- get netport 109
- get VerifyLogName 109
- get DefaultAddress 109
- Double-Take Admin security 112
- Verification Options 113
- Verification Log 115
- How Verification Works 116
- Verification log 119
- Monitoring verification 120
- Initiating verification 121
- ! set netport=1100 124
- Bandwidth Limitations 125
- Scheduled Transmission 125
- Setting bandwidth limitations 128
- Setting a transmission window 131
- The Failover Process 140
- The Failback Process 140
- Failover Clients 141
- Failover Terminology 141
- How Failover Works 142
- How Failback Works 143
- How Failure Detection Works 144
- Client Connectivity 144
- Operating System Differences 144
- Windows NT 4.0 145
- Failover Options on 146
- Failover Options 148
- Monitoring failover 156
- Initiating failback 157
- Communication ports 160
- Testing failover 161
- Failover manual intervention 161
- Conditionals 171
- Restoration Options 172
- Automating Restore 178
- Monitoring Tools 181
- Management Console Tools 182
- Customizing the statistics 184
- At-a-Glance monitoring 185
- ! The target is not loaded 187
- ! The target is busy 187
- Text Client Tools 191
- DTCL status command 192
- Windows Event Viewer 193
- Windows Performance Monitor 203
- DTStat log file 206
- Running DTStat 209
- 0—Source is not running 211
- 0—Target is not running 211
- 1—Target is running 211
- 1—Warning or error message 215
- 2—Informational message 215
- LogViewer log file 216
- Viewing the log files 218
- LogViewer Messages 219
- Configuring SNMP 223
- SNMP statistics 223
- SNMP traps 225
- Advanced Settings 227
- General options 228
- Setup options 229
- Network options 230
- Queue options 231
- Source options 232
- Target options 233
- Database options 234
- Logging options 235
- Security Access Levels 256
- Windows that contains the 257
- Source or target running on 257
- Storage Mirroring Service 259
- Storage Mirroring Groups 260
- Adding users to a group 261
- Windows 200x Active Directory 262
- Storage Mirroring Commands 264
- Connect 266
- Connect TDU 267
- Disconnect 267
- Environment 269
- Failback 269
- Failover 269
- Get Local 270
- GetEnvStr 270
- Limit Bandwidth 271
- Load Source 271
- Load Target 271
- LogViewer 273
- Mirror Pause 273
- Mirror Resume 274
- Mirror Start 274
- Mirror Stop 275
- Monitor Clear 275
- Monitor Create 275
- Monitor Delete 275
- Monitor Display 276
- Monitor Get 276
- Monitor List 276
- Monitor Move 277
- Monitor Option 278
- Monitor Remove 279
- Monitor Script Add 279
- Monitor Script Remove 280
- Monitor Start 280
- Monitor Stop 281
- Monitor Use 281
- Orphans Start 281
- Orphans Stop 282
- Pause Target 282
- Queue Task 283
- Replication Start 284
- Replication Stop 284
- Repset Calculate 285
- Repset Create 285
- Repset Delete 285
- Repset Display 286
- Repset List 286
- Repset Resync 286
- Repset Rule Add 287
- Repset Rule Remove 287
- Repset Save 288
- Repset Use 288
- Resume Target 290
- Schedule Clear 290
- Schedule Disable 290
- Schedule Enable 290
- Schedule End 291
- Schedule Start 291
- Schedule Window 292
- Set Local 293
- Shutdown 293
- Statslog Start 294
- Statslog Status 294
- Statslog Stop 294
- Transmission Pause 296
- Transmission Resume 296
- Transmission Start 296
- Transmission Stop 297
- Unload Source 297
- Unload Target 297
- Wait on Mirror 299
- Wait on Restore 299
- Wait on Target 299
- WRITE $<variable_name> 300
- DTCL Scripting 301
- DTCL Return Values 302
- DTCL Scripting Examples 305
- Basic restore script 306
- Basic flow control script 306
- Application Failover 307
- Script Sample 308
- Cluster Configurations 309
- MSCS and Storage Mirroring 310
- Configuring the first cluster 311
- Bring the Components Online 318
- Configuring the cluster 319
- Glossary 333
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