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Pausing and resuming target processing

You can break the source/target connection without disconnecting the connection, so that you can control the transmission of data across the network. You can do this by pausing the target. If the target is paused, data is queued on the source until you manually resume the target.

For example, you must pause the target while you perform a backup of database files stored on the target because the database and log files must be backed up when they are at the exact same point in time. For example, say the backup of the file mydatabase.mdf begins on the target. While the backup program has access to the file, Double-Take Availability cannot write to the file. When the backup completes, Double-Take Availability writes to the file. Double-Take Availability also writes to the corresponding mydatabase.ldf file. When the backup gets to the mydatabase.ldf file, it no longer matches the .mdf file. The database may require special startup procedures, which may result in incomplete transactions being left in the database or data loss. To workaround this scenario, pause the target before starting the backup and then resume the target when the backup is complete.

While the target is paused, the Double-Take Availability source cannot queue data indefinitely. If the source queue is filled, Double-Take Availability will automatically disconnect the connections and attempt to reconnect them.

To pause a target, open the Replication Console and right-click a target server on the left pane of the Replication Console. Select Pause Target. All active connections to that target will complete the operations already in progress. You will see Pause Pending in the Replication Console while these operations are completed. The status will update to Paused after the operations are completed. Any new operations will be queued on the source until the target is resumed. When you are ready to resume the target, right-click the target and select Resume Target.

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