# MultiNode Cluster Replication Shards

**URL:** <https://discuss.elastic.co/t/multinode-cluster-replication-shards/229018>\
**Category:** Elasticsearch\
**Created:** [April 21, 2020, 10:49am UTC](https://discuss.elastic.co/t/multinode-cluster-replication-shards/229018 "2020-04-21T10:49:50Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![ksremo](https://avatars.discourse-cdn.com/v4/letter/k/5fc32e/32.png) [@ksremo](https://discuss.elastic.co/u/ksremo)\
**Post date:** [April 21, 2020, 10:49am UTC](https://discuss.elastic.co/t/multinode-cluster-replication-shards/229018/1 "2020-04-21T10:49:50Z")

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I case i have 8 ES nodes on 4 physical Hosts with a setting of 8 primary shards and 1 replica shard.  
So it runs 2 ES Nodes on 1 physical Host.

How i can prevent that that the replica shard is stored on one of the two instances on 1 physical host?

I want high availibity in case that 1 physical host is offline.

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**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [April 21, 2020, 3:15pm UTC](https://discuss.elastic.co/t/multinode-cluster-replication-shards/229018/2 "2020-04-21T15:15:46Z")

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You should move this post to the elasticsearch forum. It is unrelated to logstash.

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**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\
**Post date:** [April 21, 2020, 3:22pm UTC](https://discuss.elastic.co/t/multinode-cluster-replication-shards/229018/3 "2020-04-21T15:22:40Z")

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Yes, use [`cluster.routing.allocation.same_shard.host`](https://www.elastic.co/guide/en/elasticsearch/reference/current/shards-allocation.html).

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**Author:** ![ksremo](https://avatars.discourse-cdn.com/v4/letter/k/5fc32e/32.png) [@ksremo](https://discuss.elastic.co/u/ksremo)\
**Post date:** [April 22, 2020, 10:08am UTC](https://discuss.elastic.co/t/multinode-cluster-replication-shards/229018/4 "2020-04-22T10:08:36Z")

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this is also working if the 2 ES Nodes deployed on virtual machines?

Like:  
Physical virtualization host 1: VM1/ES1 + VM2/ES2  
Physical virtualization host 2: VM3/ES3 + VM4/ES4  
Physical virtualization host 3: VM5/ES5 + VM6/ES6  
Physical virtualization host 4: VM7/ES7 + VM8/ES8

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**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [April 22, 2020, 10:09am UTC](https://discuss.elastic.co/t/multinode-cluster-replication-shards/229018/5 "2020-04-22T10:09:28Z")

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In that case use shard allocation awareness.

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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:** [May 20, 2020, 10:09am UTC](https://discuss.elastic.co/t/multinode-cluster-replication-shards/229018/6 "2020-05-20T10:09:28Z")

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