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# Mirror Mode

You determine the way that the DIH distributes index data by using the `MirrorMode` parameter in the DIH configuration file. In mirror mode (when you set `MirrorMode` to `True`), the DIH indexes all data to all the connected IDOL servers. Each IDOL server is identical.

The diagram below shows how the DIH in mirror mode integrates into an IDOL Server installation.

DIH system architecture (mirror mode)

The DIH sends all the index data that it receives (represented by gray arrows in the previous diagram) to all the connected IDOL Servers. The IDOL Servers are exact copies of each other, and must all have the same configuration.

You can run the DIH in mirror mode to ensure uninterrupted service if one of the IDOL Servers fails. While one IDOL Server is inoperable, its identical copies continue to index data, and are still available to return data for queries.

The DIH periodically checks whether all connected IDOL Servers are operating. If an IDOL Server is unavailable, the DIH queues the data that this IDOL Server normally receives. When the IDOL Server is available again, the DIH indexes the queued data into it.

The DIH sends administrative index actions (represented by black arrows in the previous diagram) to all connected IDOL Servers.

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