# Deploying ECE on AWS EC2 and Multiple AZs

**URL:** <https://discuss.elastic.co/t/deploying-ece-on-aws-ec2-and-multiple-azs/141646>\
**Category:** Elastic Cloud Enterprise (ECE)\
**Created:** [July 25, 2018, 6:20pm UTC](https://discuss.elastic.co/t/deploying-ece-on-aws-ec2-and-multiple-azs/141646 "2018-07-25T18:20:15Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![tarp](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/tarp/32/51884_2.png) [@tarp](https://discuss.elastic.co/u/tarp)\
**Post date:** [July 25, 2018, 6:20pm UTC](https://discuss.elastic.co/t/deploying-ece-on-aws-ec2-and-multiple-azs/141646/1 "2018-07-25T18:20:15Z")

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Hi,  
The account I'm using at AWS to deploy ECE to has 4 available AZs. ECE only requires 3 for a Fault Tolerant install. Should I configure it to only use 3 out 4 or use all 4?

thanks,  
Tim

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**Author:** ![Alex\_Piggott](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/alex_piggott/32/11053_2.png) [@Alex\_Piggott](https://discuss.elastic.co/u/Alex_Piggott)\
**Post date:** [July 27, 2018, 1:33pm UTC](https://discuss.elastic.co/t/deploying-ece-on-aws-ec2-and-multiple-azs/141646/2 "2018-07-27T13:33:03Z")

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You can definitely use all 4 though you don't get much benefit from doing so ... ECE will pick 3 out of the 4 zones to deploy to for each HA cluster

(You should only have 3 or 5 ZK servers though)

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<div class="post-metadata">

**Author:** ![tarp](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/tarp/32/51884_2.png) [@tarp](https://discuss.elastic.co/u/tarp)\
**Post date:** [July 27, 2018, 1:45pm UTC](https://discuss.elastic.co/t/deploying-ece-on-aws-ec2-and-multiple-azs/141646/3 "2018-07-27T13:45:02Z")

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Thanks, I'll manually put it to 3 AZs for now.

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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:** [August 10, 2018, 1:57pm UTC](https://discuss.elastic.co/t/deploying-ece-on-aws-ec2-and-multiple-azs/141646/4 "2018-08-10T13:57:39Z")

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