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Configuring network communication properties for a server

1. Right-click a server on the left pane of the Replication Console.
2. Select Properties

3. Select the Network tab.

   

4. Specify the network communication properties.
• Default Address—On a machine with multiple NICs, you can specify which address Double-Take Availability traffic will use. It can also be used on machines with multiple IP addresses on a single NIC.
• Default Protocol—The default protocol for all Double-Take Availability communications is the TCP/IP protocol. In the future, Double-Take Availability may support other communication protocols.
• Service Listen Port—Double-Take Availability servers use the Service Listen Port to send and receive commands and operations between two Double-Take Availability servers.
• Heartbeat Transmit Port—A Double-Take Availability server sends its heartbeats to the Heartbeat Transmit Port.
• Status Listen Port—Double-Take Availability servers use the Status Listen Port to listen for requests from the Replication Console and other clients.
• Time Between Heartbeats—All Double-Take Availability servers transmit a heartbeat. This heartbeat allows other Double-Take Availability servers and Double-Take Availability clients to locate and identify the Double-Take Availability servers. The heartbeat is a broadcast UDP transmission. This heartbeat can be disabled, but if it is, Double-Take Availability will not auto-detect the Double-Take Availability servers to populate the Replication Console. By default, there are 3 seconds between heartbeats. If you set this option to 0, the heartbeats are disabled.
• Missed Heartbeat Limit—This is the number of heartbeats which can be missed before transmission is stopped and data is queued on the source.
• Show Heartbeat Messages in Logger—This checkbox enables the heartbeat messages in the Double-Take Availability log. Enabling this option will cause your logs to fill up faster.

• TCP Window Size—This option is the size, in bytes, of the buffer used for TCP transfers. This is an operating system buffer, not a Double-Take Availability buffer. If this option is set to zero (0), Linux kernel versions 2.6.7 or later can automatically tune this buffer setting for best server performance. Therefore, the recommended setting is 0 for automatic tuning, if you are using a version 2.6.7 or later Linux kernel. If you want to reduce or control network traffic, you can configure this option to a static size. The default is 375000 for a 1 GB network. Modifications should be relative to that speed using the calculation 37500 * network_speed_in_bits_per_second / 100 Mbit.

  If you want to control network traffic, you may find the Double-Take Availability bandwidth limiting features to be a better method.

   

5. Click OK to save the settings.

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