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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.
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.
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 firstname.lastname@example.org. 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.
By default, you are limited to a total of 5 Spot Instance requests in a region. New AWS accounts might have lower limits. Currently, the instance types T2, I2, and HS1 are not available on Spot. Also, some instance types are not offered in all regions. (For information about instance types, see Instance Types.)
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.
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.