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How Reserved Instances are Applied

Reserved Instances are applied to instances that meet the type/location criteria during the specified period. In this example, a user is running the following instances:

  • (4) m1.small instances in Availability Zone us-east-1a

  • (4) c1.medium instances in Availability Zone us-east-1b

  • (2) c1.xlarge instances in Availability Zone us-east-1b

The user then purchases the following Reserved Instances.

  • (2) m1.small instances in Availability Zone us-east-1a

  • (2) c1.medium instances in Availability Zone us-east-1a

  • (2) m1.xlarge instances in Availability Zone us-east-1a

Amazon EC2 applies the two m1.small Reserved Instances to two of the instances in Availability Zone us-east-1a. Amazon EC2 doesn't apply the two c1.medium Reserved Instances because the c1.medium instances are in a different Availability Zone and does not apply the m1.xlarge Reserved Instances because there are no running m1.xlarge instances.

Zend Framework