Does more indexers contribute to the performance of search on search head?

[nickcode]

Does more indexers contribute to the performance of search on search head?
I found when i launch a search in the search head, every time there is only one indexer in my indexers group running
. And the event scanning speed is not faster than all the things done within a single splunk instance.
I wonder if the more indexers there are, the faster search speed it is?

[yannK]

YES.
More indexers, means that the events are balanced between multiple instances, each of them will have a less data to search over, and it will be parallelized.

Make sure that your forwarder are loadbalancing between your indexers.
You can verify why a search like :

index=* | stats count by index splunk_server

or ove the time with

index=* | timechart count by splunk_server