Distributed Action Handler 25.4
Distributed Action Handler Help

# Requirements

This section describes the software and hardware requirements for Knowledge Discovery and the DAH.

## Child servers Required

You must have at least two child servers installed for the DAH to distribute to.

NOTE: A single DAH can distribute to up to 1,024 child servers. However, OpenText recommends that you use the DAH to distribute to no more than 16 child servers, because distributing to a larger number can have a negative impact on processing time.

## State-Changing Actions File

In mirror mode, DAH uses the `sca.dat` file to determine the state-changing actions that it must distribute to all child servers.

When you are running the DAH in mirror mode, you must ensure that the `sca.dat` file is present. By default, this file must be in the same directory as the DAH, but you can also set the SCAFileDirectory configuration parameter to the location of this file.

If you upgrade DAH, you might need to download a new `sca.dat` file from the OpenText Software Licenses and Downloads portal (SLD). Refer to the Knowledge Discovery Release Notes.

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: Requirements