Amazon Elastic Compute Cloud
User Guide (API Version 2014-02-01)
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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 Request limit is the number of instances per region that you can request.

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 rise to excessively high levels.

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

Note

If you currently have a bid above the new default limit, we recommend that you cancel your existing bid, and start bidding within the limits before December 20, 2013. 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, please submit a limit increase request to spot-limit-increase@amazon.com. Your limit increase request must include the following information:

  • Your AWS account number.

  • 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

For many instance types, you are limited to a total of 100 Spot requests per region. Some instance types are not available in all regions, and certain instance types have lower regional limits, as shown in the following table. 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.

Note

New AWS accounts may start with limits that are lower than the limits described here. In addition, if your account has a custom regional Spot request limit, the custom limit overrides all limits described here.

The following table lists instance types and their Spot request limits. The default regional Spot request limit is 100.

Instance TypeSpot Limit

cg1.4xlarge

10

c3.4xlarge, c3.8xlarge

20

g2.2xlarge

10

m2.2xlarge, m2.4xlarge

20

cc1.4xlarge

20

cc2.8xlarge

20

hi1.4xlarge

10

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

10

r3.4xlarge, r3.8xlarge

5

hs1.8xlarge

Not Offered

i2 instances

Not Offered

If you need more Spot Instances, complete the Amazon EC2 instance request form with your use case, specify in the Use Case Description that you are requesting an increase to your account's Spot Instance limits, and your instance increase will be considered. Limit increases are tied to the region specified in the Spot Instance request.

For information about instance types, see Instance Types.