Dear Dharani,

Hope you are doing well,

By default, when you create an EC2 account with Amazon, your account is limited to a maximum of 20 instances per EC2 region with two default High I/O Instances (hi1.4xlarge) (not availability zone). Before you can have more than 20 running instances running at the same time in one EC2 region, you must first get approval directly from Amazon. You must specify which EC2 region you would like to increase your limit. Limit increases apply to that region only.

  1. This includes instances launched from a server array. Your array will start new instances until you reach your limit of total instances allowed.
  2. Only running instances count against your limit.

You can request an increase to your limit from Amazon here: http://aws.amazon.com/contact-us/ec2-request/

Please let me know if you have any further issue regarding this.

Feel free to contact us in case you have any other query. 
 
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Regards,
Suman Samanta
edureka! Support Team
On Sun, 1 May at 11:38 PM , dd <dd_mishra@hotmail.com> wrote:
I was going through Amazon EC2 FAQ at :  https://aws.amazon.com/ec2/faqs/
There was this question : How many instances can I run in Amazon EC2?
The answer to this question says - " You are limited to running up to 20 On-Demand instances, purchasing 20 Reserved Instances....."
But there was another question : How quickly can I scale my capacity both up and down?
As part of answer to this question it was mentioned there that : "You can commission one, hundreds or even thousands of server instances simultaneously......"
So my question is, if there is a 20/20 limit on the aws instances, then how can we launch hundreds of EC2 instances simultaneously? May be I am missing something here...

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