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Auto-Remirror
When a source machine fails, the auto-reconnect feature will reestablish the source/target connection when the source is
back online. The auto-remirror option will then initiate the mirror process to synchronize the files on the source and target
machines. For more information on source machine failures, see
Auto-Disconnect and Auto-Reconnect on page 6-6 .
When a target machine fails, the Storage Mirroring source maintains the source/target connection and queues replication data.
Depending on the reason for the target machine failure, the Storage Mirroring source may or may not be able to send the
queued replication data when the target is back online. If the target machine itself has not failed and the Storage Mirroring
service is still running (for instance, a cable or NIC failure), the source can begin sending the queued replication data when
the target becomes available. However, if the target machine fails, the data integrity between the source and target cannot
be guaranteed. In this case a remirror is required. The auto-remirror feature allows a remirror to be initiated automatically
in the event that the Storage Mirroring service is restarted on the target machine while a source/target connection was
established.
In the event of a source machine failure, an auto-reconnect will reestablish the source/target connection that existed prior to
the failure. However, because of the source machine failure, the data integrity between the source and target machines cannot
be guaranteed. If enabled, an auto-remirror will ensure that the data is identical.
The following table illustrates how the auto-remirror options work together, as well as how they work with the global
checksum setting on the Source tab of the Server Properties. Determine which options you need to select when configuring
auto-remirror by identifying which type of action you want Storage Mirroring to perform during the auto-remirror.
File Differences Auto-Remirror Options
NOTE: Auto-remirror cannot be set on a connection basis. If auto-remirror is turned on, all connections from that
source machine will perform an auto-remirror on a reconnect.
If auto-remirror is disabled and an auto-reconnect occurs, the transmission state of the connection will remain
pending after the reconnect until a remirror is started manually.
Block Checksum
All
a
a.This option is located on the Server Properties Source tab. A checkmark enclosed in parentheses (!) indicates that
the global option on the Server Properties source tab can be on or off. The use of this option does not change the
action performed during the mirror.
Checksum
No
Checksum
Action Performed
(
!)
!
Any file that is different on the source and target based on the
date, time, and/or size is transmitted to the target. The mirror
sends the entire file.
!
Any file that is different on the source and target based on date,
time, and/or size is flagged as different. The mirror then performs
a checksum comparison on the flagged files and only sends those
blocks that are different.
!!
The mirror performs a checksum comparison on all files and only
sends those blocks that are different.
NOTE:
Database applications may update files without changing the date, time, or file size. Therefore, if you are using
database applications, you should use the Block Checksum All option on the Server Properties Source tab to
ensure proper file comparisons.
- 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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