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Mirroring automatically

In certain circumstances, for example if the disk-based queues on the source are exhausted, Double-Take Availability will automatically disconnect connections (called auto-disconnect) and then automatically reconnect them (called auto-reconnect). In order to ensure data integrity on the target, Double-Take Availability will perform an automatic mirror (called an auto-remirror) after an auto-reconnect.

Note:

Auto-remirror is a per source option. When enabled, all connections from the source will perform an auto-remirror after an auto-reconnect. When disabled, none of the connections from the source will perform an auto-remirror after an auto-reconnect.

Open the Replication Console, and right-click a server in the left pane of the Replication Console and select Properties.
Select the Setup tab.

Verify that Perform Remirror After Auto-Reconnect is selected to initiate an auto-remirror after an auto-reconnect.

Note:

If auto-remirror is disabled and an auto-reconnect occurs, the transmission state of the connection will remain pending after the reconnect until a mirror is started manually.

Verify that Mirror only Changed Files on Source Reboot is selected to use the Windows NTFS change journal to track file changes. When this option is enabled, if the source is rebooted, only the files identified in the change journal will be remirrored to the target. This setting helps improve mirror times.
Specify the type of mirror that you wish to perform.

Differences with Checksum—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.
Differences with no Checksum—Any file that is different on the source and target based on date, time, and/or size is sent to the target.
Send data only if Source is newer than Target—Only those files that are newer on the source are sent to the target.
Full—All files are sent to the target.

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 Differences with checksum or Full option.

Stopping, starting, pausing, or resuming mirroring contains a comparison of how the file difference remirror settings work together, as well as how they work with the global checksum setting on the Source tab of the Server Properties.

Click OK to save the settings.