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Yes. You should be able to specify the Retention Rules for that data source such that it has

replicants=2

on

tier1

. The coordinator will decide which two historical hosts will have each of those 2 replicas within tier1 historicals. You should use a load rule ( loadForever, loadByPeriod, etc) and not a broadcast rule that will push replicas to all nodes.

To clarify though if it has more than 1 segment it will be spread out across all of them in a balanced manner. The replication for each segment will be spread across 2 nodes but the segments them selves will be spread out across all historicals in the tier. Outside of tiering I am not aware of any way to indicate which datasource segments should load on which historicals.