Required nodes for an On-Premise HA Search service

To configure your on-premise search nodes for HA, you need to split the search service from the ingress replicator so that each service can be made redundant. You need a load balancer to direct traffic to each set of services. Here you can find an example with four nodes described: two for ingress and two for search. Your configuration may vary depending on your requirements.

Note that an ingress replicator service an run on the same host as the search service.

Table 1. On-Premise HA Search Configuration Node Requirements
Search component	Nodes required	Description
Ingress replicator	2 separate nodes	The ingress replicators journal everything to disk to guarantee all ingressed activities (such as new content or content updates) will be delivered to a search node at least once.
Search service	2 separate nodes	The search nodes handle incoming search queries and return search results. For a diagram of how this works, see Configuring On-Premise Search service for high-availability.