# Infra details clarification

**URL:** <https://discuss.elastic.co/t/infra-details-clarification/208819>\
**Category:** Logstash\
**Created:** [November 21, 2019, 7:11am UTC](https://discuss.elastic.co/t/infra-details-clarification/208819 "2019-11-21T07:11:34Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![raja.arumugam3](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/raja.arumugam3/32/50393_2.png) [@raja.arumugam3](https://discuss.elastic.co/u/raja.arumugam3)\
**Post date:** [November 21, 2019, 7:11am UTC](https://discuss.elastic.co/t/infra-details-clarification/208819/1 "2019-11-21T07:11:34Z")

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How to decide number of logstash nodes for elastic nodes. Is there is any ratio or calculations are there ?

for example, i have 1TB of logs per day, i want to have online retention of 30 days at any point of time.

In this case, totaly 30TB is required from elastic search and we can have 4 elastic search node with each 10TB of memory with 64GB RAM without replica.

how many logstash and can be planned.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 19, 2019, 7:11am UTC](https://discuss.elastic.co/t/infra-details-clarification/208819/2 "2019-12-19T07:11:55Z")

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