Elastic search RAM size


We have ES 2.4 version cluster with 18TB of data (primary + 2 replicas). We have around 12 data nodes with 3TB of disk and 60 GB of RAM ( 30G Heap).

We have around 100 indices of around 30 GB of size.

Our search response time is very high (average 4 sec). Queries are not cached as we don't get very frequent search.

Would increasing File system cache by adding more RAM, say around 150GB would help in search performance?

Yes, but depends by how much on where your bottleneck is (cpu, ram, disk, network).

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.