# Elk stack node number
**URL:** https://discuss.elastic.co/t/elk-stack-node-number/131027
**Category:** Elasticsearch
**Created:** [May 8, 2018, 2:45pm UTC](https://discuss.elastic.co/t/elk-stack-node-number/131027 "2018-05-08T14:45:27Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@mkemalm](https://discuss.elastic.co/u/mkemalm)
#### Post date: [May 8, 2018, 2:45pm UTC](https://discuss.elastic.co/t/elk-stack-node-number/131027/1 "2018-05-08T14:45:27Z")
Hi,
I am curious about how can I decide number of nodes for a production elk stack cluster. My questions are below;
How can I decide;
-How many data nodes do I need? (how many of them are for hot data, how many of them for warm data?)
-Master nodes should be at least 3, can I install them on data nodes or are seperated master nodes better?
-I read that ingest node is only useful for log tailing functions, for more functions(metrics etc.) I should use logstash. Is it correct? How many logstash servers should I use?
-Should I use a seperated ML node or can I mark master nodes as ML node?
Regards.
---
### Author:  [@dadoonet](https://discuss.elastic.co/u/dadoonet)
#### Post date: [May 8, 2018, 3:31pm UTC](https://discuss.elastic.co/t/elk-stack-node-number/131027/2 "2018-05-08T15:31:17Z")
May I suggest you look at the following resources about sizing:
[https://www.elastic.co/elasticon/conf/2016/sf/quantitative-cluster-sizing](https://www.elastic.co/elasticon/conf/2016/sf/quantitative-cluster-sizing)
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### Author:  [@zqc0512](https://discuss.elastic.co/u/zqc0512)
#### Post date: [May 9, 2018, 7:13am UTC](https://discuss.elastic.co/t/elk-stack-node-number/131027/3 "2018-05-09T07:13:02Z")
this is about your data as:
1. how many data in seconds input es;
2. enyone the data size;
3. how many the data fields;
4. search respone time;
5. the machine cpu and memory;
6. ect...
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [June 6, 2018, 7:13am UTC](https://discuss.elastic.co/t/elk-stack-node-number/131027/4 "2018-06-06T07:13:05Z")
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