Where do data model summaries reside in a distributed environment with search head and indexer clusters?

[pedromvieira]

In a Distributed Environment with a Search head Cluster and Indexer Cluster, where do Data Model acceleration summaries resides?
In the Searchhead Cluster or in the indexer Cluster? This is a question to estimate storage sizing requirements.
Assuming that users only access through Searchheads.
Does the cluster replication / bundle work with available search copies of the data?

Thanks.

[jluo_splunk]

Data model acceleration summaries regularly live in the indexers. Only summary indexes live on the search heads.