According to the Splunk Reference Architecture document1, for ES, Splunk recommends sizing based on 80 to 100 GB ingest per indexer per day. This means an ES deployment with 2 TB daily ingest will require up to 20 indexers. This recommendation is for a non-cloud (on-prem) ES deployment. For a cloud-based ES deployment, the recommended volume of indexing per day, per indexer, is 50 GB2. The other options, 300 GB and 500 MB, are not recommended by Splunk for ES deployments. References =
Splunk Reference Architecture
Performance reference for Splunk Enterprise Security
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