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# 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 HPE Big Data customer support site. Refer to the Distributed Action Handler Release Notes.

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