Elastic search RAM size

Elastic Stack Elasticsearch
1

Hello,

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?

2

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

3

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