Amazon Elastic Compute Cloud
User Guide for Linux (API Version 2014-09-01)
« PreviousNext »
View the PDF for this guide.Go to the AWS Discussion Forum for this product.Go to the Kindle Store to download this guide in Kindle format.Did this page help you?  Yes | No |  Tell us about it...

Spot Instance Limits

When you work with Spot Instances, there are two kinds of limits to consider: bid price limits and request limits.

  • A Spot bid price limit is the maximum price you can bid when you make a request for Spot Instances.

  • A Spot Instance request limit is the number of instances per region that you can request.

For information about other AWS service limits, see AWS Service Limits.

Spot Bid Price Limits

Starting on December 20, 2013, Amazon EC2 introduced a default limit on the maximum amount that you can bid for a Spot Instance. The default bid price limit is designed to protect Spot Instance customers from incurring unexpected charges due to high bid prices. The limit also aims to reduce the likelihood that Spot Prices will rise to excessively high levels.

The default bid limit is set to four times the On-Demand price. For example, if you submit a Spot Instance request for a Linux m3.2xlarge instance in the us-east-1 region, for which the On-Demand price is $0.900 per hour, you can bid up to $3.600 per hour.

Note

If you placed a recurring bid before December 20, 2013, check that the bid price is not above the new default limit. We recommend that you cancel the bid and start bidding within the limits. After that date, Spot Instance requests that exceed your account's bid limit may not be processed.

If your application requires you to bid above the default bid price limit, submit a limit increase request to spot-limit-increase@amazon.com. Your limit increase request must include the following information:

  • Your AWS account number.

  • A description of how you use Spot Instances and manage Spot interruptions.

  • The bid price limit you are requesting (specifying the instance type, region, and product platform).

For information about On-Demand instance pricing, see Amazon EC2 Pricing.

Spot Request Limits

The number of Spot Instance requests an account can make per region varies depending on factors such as region, instance type, and the account's status. You might be limited to as low as 1 instance per region if you are a new AWS customer or if you are requesting certain instance types. In addition, the instance types T2, I2, and HS1 are not available on Spot, and some instance types (e.g., g2.2xlarge) are not available in all regions.

If you submit a Spot Instance request and you receive an error stating Max spot instance count exceeded, try submitting another request with fewer instances.

The following table lists the different limits for certain instance types per region.

Instance TypeSpot Limit

cg1.4xlarge

10

g2.2xlarge

10

c3.4xlarge, c3.8xlarge

20

cc1.4xlarge

20

cc2.8xlarge

20

m2.2xlarge, m2.4xlarge

20

hi1.4xlarge

10

r3.large, r3.xlarge, r3.2xlarge

10

r3.4xlarge, r3.8xlarge

5

hs1.4xlarge

Not Offered

If you need to make additional Spot requests in a region, complete the Amazon EC2 instance request form. Specify in the Use Case Description that you are requesting an increase to your account's Spot Instance request limit. Limit increases apply to the region specified in the request form.

Note

Keep in mind that even if you are within your Spot request limits, your Spot Instances can be terminated if your bid price no longer exceeds the Spot price, or if there is a Spot capacity shortage.