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# Use Chained Distributed Index Handler Servers

You can set up multiple HPE DIH instances in a chained configuration. In this configuration, a parent HPE DIH distributes to child HPE DIH servers, which in turn distribute to child IDOL servers.

HPE DIH system architecture (chained configuration)

In this configuration, the parent HPE DIH forwards all IDOL Server index actions to the child HPE DIH servers in the same way as to child IDOL Servers.

Note: Some index actions have different effects when sent to a child HPE DIH than when sent to an IDOL Server, because the HPE DIH forwards the action to multiple IDOL Servers.

Chaining provides an extra level of redundancy both at the HPE DIH level and at the IDOL Server level. It also distributes network traffic and system load over a larger number of computers. Use a chained HPE DIH server configuration to create a pool of IDOL Servers that are both fault-tolerant for maximum availability, and distributed for the best performance.

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