# Dedicated replica nodes
**URL:** https://discuss.elastic.co/t/dedicated-replica-nodes/180321
**Category:** Elasticsearch
**Created:** [May 9, 2019, 9:29am UTC](https://discuss.elastic.co/t/dedicated-replica-nodes/180321 "2019-05-09T09:29:48Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@sambodhi](https://discuss.elastic.co/u/sambodhi)
#### Post date: [May 9, 2019, 9:29am UTC](https://discuss.elastic.co/t/dedicated-replica-nodes/180321/1 "2019-05-09T09:29:48Z")
We have two use cases, forcing us to think about autoscaling in a way that we can have more nodes which have only replica shards.
1. We use spot instances which can recycle (change) instance once a month. If these instances can hold replicas (only), we can add more nodes on spot for our cost.
2. We have very inconsistent traffic, am thinking if it is possible to add more nodes during our peak hours which have only replicas.
I understand data movement can degrade performance, not sure if this is a right thing to do. Any help will be good, thanks.
We are on elasticsearch 6.3, 9 nodes cluster with 1 replica \> 1TB data.
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [May 9, 2019, 9:32am UTC](https://discuss.elastic.co/t/dedicated-replica-nodes/180321/2 "2019-05-09T09:32:34Z")
You cannot guarantee that node will only hold replicas.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [June 6, 2019, 9:32am UTC](https://discuss.elastic.co/t/dedicated-replica-nodes/180321/3 "2019-06-06T09:32:36Z")
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