# Quick question on which Amazon instance type to use **URL:** \ **Category:** Elasticsearch\ **Created:** [August 2, 2012, 5:28pm UTC](https://discuss.elastic.co/t/quick-question-on-which-amazon-instance-type-to-use/8612 "2012-08-02T17:28:43Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![N000b](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/n000b/32/2790_2.png) [@N000b](https://discuss.elastic.co/u/N000b)\ **Post date:** [August 2, 2012, 5:28pm UTC](https://discuss.elastic.co/t/quick-question-on-which-amazon-instance-type-to-use/8612/1 "2012-08-02T17:28:43Z")
Firstly, great job on ElasticSearch. I've been reading about it all week and it seems amazing. 2 choices of instances on Amazon are: _Extra Large Instance_ 15 GB memory 8 EC2 Compute Units (4 virtual cores with 2 EC2 Compute Units each) 1,690 GB instance storage 64-bit platform I/O Performance: High EBS-Optimized Available: 1000 Mbps API name: m1.xlarge _High-Memory Double Extra Large Instance_ 34.2 GB of memory 13 EC2 Compute Units (4 virtual cores with 3.25 EC2 Compute Units each) 850 GB of instance storage 64-bit platform I/O Performance: High EBS-Optimized Available: No API name: m2.2xlarge The cost ratio is around 2 High-Memory for 3 Extra-Large. So which one is most indicated for ElasticSearch cluster overall (A cluster of 2 HighMemory or one of 3 Extra Large)? I know this might be a hard question to answer without knowing the use of it, but I’m just trying to get a sense of ES resource requirements. I’d use to index around 1 billion documents. Thanks ---
**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, 3:17am UTC](https://discuss.elastic.co/t/quick-question-on-which-amazon-instance-type-to-use/8612/2 "2017-07-06T03:17:57Z")