# Which ES cluster would give better performance? 1 shard 2 replicas or normal 2 shards **URL:** \ **Category:** Elasticsearch\ **Created:** [January 21, 2015, 4:17pm UTC](https://discuss.elastic.co/t/which-es-cluster-would-give-better-performance-1-shard-2-replicas-or-normal-2-shards/21753 "2015-01-21T16:17:38Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Darin\_Hensley](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/darin_hensley/32/32794_2.png) [@Darin\_Hensley](https://discuss.elastic.co/u/Darin_Hensley)\ **Post date:** [January 21, 2015, 4:17pm UTC](https://discuss.elastic.co/t/which-es-cluster-would-give-better-performance-1-shard-2-replicas-or-normal-2-shards/21753/1 "2015-01-21T16:17:38Z")
Which cluster would give better read performance on two separate servers? ES cluster Foo [] serverA - 1 primary shard [] serverB - 2 replica Shards ES cluster Bar [] serverA - 1 primary shard and 1 replica shard [] serverB - 1 primary shard and 1 replica shard -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/f76d093b-15a6-4896-909f-517a3acd379a%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/f76d093b-15a6-4896-909f-517a3acd379a%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\ **Post date:** [January 21, 2015, 8:48pm UTC](https://discuss.elastic.co/t/which-es-cluster-would-give-better-performance-1-shard-2-replicas-or-normal-2-shards/21753/2 "2015-01-21T20:48:42Z")
You won't ever be able to store two of the same replicas shards on the same server, so your first example won't work. On 22 January 2015 at 05:17, Darin Hensley [darin.hensley@gmail.com](mailto:darin.hensley@gmail.com) wrote: > Which cluster would give better read performance on two separate servers? > > ES cluster Foo > serverA - 1 primary shard > serverB - 2 replica Shards > > ES cluster Bar > serverA - 1 primary shard and 1 replica shard > serverB - 1 primary shard and 1 replica shard > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/f76d093b-15a6-4896-909f-517a3acd379a%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/f76d093b-15a6-4896-909f-517a3acd379a%40googlegroups.com) > [https://groups.google.com/d/msgid/elasticsearch/f76d093b-15a6-4896-909f-517a3acd379a%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/f76d093b-15a6-4896-909f-517a3acd379a%40googlegroups.com?utm_medium=email&utm_source=footer) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAEYi1X9\_fNS-xmE%3DAr1tFXX-ewu1VobAgh%2BnMcS\_2VxZavATKw%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAEYi1X9_fNS-xmE%3DAr1tFXX-ewu1VobAgh%2BnMcS_2VxZavATKw%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![Darin\_Hensley](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/darin_hensley/32/32794_2.png) [@Darin\_Hensley](https://discuss.elastic.co/u/Darin_Hensley)\ **Post date:** [January 21, 2015, 9:05pm UTC](https://discuss.elastic.co/t/which-es-cluster-would-give-better-performance-1-shard-2-replicas-or-normal-2-shards/21753/3 "2015-01-21T21:05:56Z")
On [Elasticsearch Platform — Find real-time answers at scale | Elastic](http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/replica-shards.html) in "Figure 52. Adjust the number of replicas to balance the load between nodes" they show Node 3 which contains only 2 replica shards. They state in it "The fact that node 3 holds two replicas and no primaries is not important." On Wednesday, January 21, 2015 at 10:17:38 AM UTC-6, Darin Hensley wrote: > Which cluster would give better read performance on two separate servers? > > ES cluster Foo > serverA - 1 primary shard > serverB - 2 replica Shards > > ES cluster Bar > serverA - 1 primary shard and 1 replica shard > serverB - 1 primary shard and 1 replica shard -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/24dddc28-5aaa-4621-9181-c65d55660a8c%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/24dddc28-5aaa-4621-9181-c65d55660a8c%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![Darin\_Hensley](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/darin_hensley/32/32794_2.png) [@Darin\_Hensley](https://discuss.elastic.co/u/Darin_Hensley)\ **Post date:** [January 21, 2015, 9:15pm UTC](https://discuss.elastic.co/t/which-es-cluster-would-give-better-performance-1-shard-2-replicas-or-normal-2-shards/21753/4 "2015-01-21T21:15:04Z")
Oh, I see what you mean...sorry about that. Thanks! On Wednesday, January 21, 2015 at 10:17:38 AM UTC-6, Darin Hensley wrote: > Which cluster would give better read performance on two separate servers? > > ES cluster Foo > serverA - 1 primary shard > serverB - 2 replica Shards > > ES cluster Bar > serverA - 1 primary shard and 1 replica shard > serverB - 1 primary shard and 1 replica shard -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/6c59527a-51c8-4174-939f-dd142512fab3%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/6c59527a-51c8-4174-939f-dd142512fab3%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 12:37am UTC](https://discuss.elastic.co/t/which-es-cluster-would-give-better-performance-1-shard-2-replicas-or-normal-2-shards/21753/5 "2017-07-06T00:37:26Z")