Minimum number of Hot and Warm data nodes

We are planning for a elasticsearch cluster with multiple hot and warm data nodes. Wanted to know whether minimum 2 nodes are fine for each of the data nodes or minimum 3 nodes are recommended. We have around 4TB of data. And Master and co-coordinating nodes are different. I do understand that 3 nodes will provide the HA. But wanted to understand it in more detail.

If you only have around 4TB of data, why do you think you need a hot/warm architecture?

In future data will grow ..may be 50TB or 75TB or more. Is there any recommended data size where the usage hot and warm architecture will come into picture?

There is no clear guideline on when a hot/warm architecture starts making sense. It depends a lot on ingest volume, retention period and query patterns.

Hi Christian, Can you please complete your comment? Thanks.

Just to add the retention period is 8 days. So wanted to know whether hot and warm node architecture makes sense here.

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