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Setting transmission options

1. From the Protection summary page, click Change in the Data transmission section.
2. Specify any of the following data transmission options.
• Chose when to use compression—Specify the level of compression you want to use. Compression reduces the amount of bandwidth needed to transmit data from the source to the target. The data is compressed before being transmitted and then is uncompressed before it is written on the target. Typically, compression is used in WAN environments, but not in LAN environments. If desired, enable compression and select the level of compression that you want to use. All connections to the same target will have the same compression settings.
• Transmit when the snapshot data reaches this size—Specify the size, in MB, that will trigger when snapshots of the source are transmitted to the target. When multiple virtual disks are used, any combination of writes across all virtual disks that accumulate to the specified size will trigger transmission.
• Transmit data, regardless of snapshot size, after—Specify a length of time that will trigger when snapshots of the source are transmitted to the target. Transmission will occur regardless of the size of the snapshots.

Note:

A snapshot transmission cycle will begin when either of the time or size threshold conditions are met. During the snapshot transmission cycle, the thresholds are not monitored. After the snapshot transmission cycle has completed, the application will again monitor the thresholds. If either of the thresholds were crossed during the snapshot transmission cycle, a new transmission cycle will begin immediately. You may want to adjust the snapshot transmission options to optimize performance in your environment. Some factors you need to consider when adjusting these settings include the volume of write traffic in the virtual machine, the allowed data loss time period, and the cost to the virtual infrastructure.

• Send data to this route—By default, Double-Take Availability for VMware Infrastructure will select the default route for transmissions between the two ESX servers. If desired, select a different IP address on the target that will be used for transmissions.
• Limit bandwidth—Bandwidth limitations are available to restrict the amount of network bandwdith used for Double-Take Availability for VMware Infrastructure data transmissions. When a bandwidth limit is specified, Double-Take Availability for VMware Infrastructure never exceeds that allotted amount. The bandwidth not in use by Double-Take Availability for VMware Infrastructure is available for all other network traffic. Enter a value in kilobits per second to limit data transmission. This is the maximum amount of data that will be transmitted per second.
3. Click Save.

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