Distributed Action Handler 25.4
Distributed Action Handler Help

# Add Child Server Groups

In non-mirror mode, you can configure DAH with child server groups. Each child server group contains a set of mirrored child servers. DAH contacts only one of the child servers in the mirror group for each action, according to your configured DistributionMethod.

NOTE: If you use child server groups, you cannot also use virtual databases.

To add a child server mirror to an existing child server

1. Open the DAH configuration file in a text editor.

2. Find the section where you configure your child servers (`[DAHEngineN]`, `[DistributedEngineN]`, or `[IDOLServerN]`).

3. In the Host parameter, add the host names or IP addresses of the mirrored child servers. Separate multiple names with commas.

       Host=host1,host2

4. In the Port parameter, add the ports of the mirrored child servers, separated with commas. The first port must correspond to the first value in the Host parameter, the second port must correspond to the second value in the Host parameter, and so on.

       Port=9100,9100

5. If you use the HostPortAlias configuration parameter, update this parameter to specify a value for each mirror.

       HostPortAlias=12.3.4.56:9100,23.45.67.12:9100

6. (Optional) If you use the Weight, Priority, or SSLConfig parameters, you can specify a value for each child server. If you use a single value, all child servers in the group use the same value.

       Weight=75,25
       Priority=4
       SSLConfig=SSLOption3

7. If you have set UseEngineAlias to `True` in the `[Server]` section, add the MirrorName configuration parameter to the child server configuration. Set this parameter to a comma-separated list of aliases. You must configure an alias for each child server.

       MirrorName=childserver1,childserver2

8. Save and close the configuration file.

9. Restart the DAH for your changes to take effect.

Copyright 2025 Open Text
Version 25.4 | Last updated October 2025

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Product: Knowledge Discovery Distributed Action Handler 25.4

Topic Title: Add Child Server Groups