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# Use DREADD

The HPE DIH accepts the `DREADD` indexing action, which allows you to send data (that is accessible to the HPE DIH through the file system) directly to the HPE DIH for indexing. Use the following action syntax:

    http://DIHhost:IndexPort/DREADD?parameters

When you send this action to the HPE DIH instead of to an IDOL Server, note that:

- `DIHhost` and `IndexPort` are the host and index port of the HPE DIH, not of any of its child IDOL Servers.
- In mirror mode, HPE DIH sends the data to every child IDOL server for indexing. In simple non-mirror mode, the HPE DIH decides which IDOL server receives index data, but all IDOL servers receive all actions. Use reference-based indexing or `DistributeSendMinimal` to further reduce the amount of traffic and IDOL Server load by allowing the HPE DIH to distribute index data and index actions.
- When you use the `PreserveDREADD` configuration option, all the child servers must have access to the index file.

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