Release: Amazon EC2 on 2009-03-11

Release Notes>Amazon EC2>Release: Amazon EC2 on 2009 03 11
This release introduces the Amazon EC2 Reserved Instances.


Submitted By: Bruce@AWS
Release Date: March 11, 2009 12:00 AM GMT
Latest Version: 2009-03-01
Latest WSDL:
Created On: March 11, 2009 11:17 PM GMT
Last Updated: March 12, 2009 6:25 AM GMT

New Features

Reserved Instances Amazon EC2 now supports an additional pricing option. With Amazon EC2 Reserved Instances, you can make a low one-time payment for each instance you want to reserve and receive a significant discount on the hourly usage charge for that instance.

For more information, refer to the Amazon Elastic Compute Cloud Product Page or the Amazon Elastic Compute Cloud Developer Guide.


Known Issues

Windows AMI launch times Windows AMIs take longer to launch than Linux/UNIX instances due to larger AMI sizes and multiple reboots.
Windows AMI sizes Installing software on Windows AMIs can cause them to become large and easily reach the 10 GB limit. Before bundling, check the size of the C:\ volume.
Windows instance availability Initially, Windows instances will only be available in a single availability zone. Until notified, do not specify an availability zone when using ec2-run-instances; Amazon EC2 automatically launches Windows instances in the correct zone.
Limitation on drive mapping There is currently no support for volume attachment to devices beyond /dev/sdp on instances running Linux/UNIX and xvdp on instances running Windows.
Security group limitation AuthorizeSecurityGroupIngress does not allow port ranges for group grants when using the command-line tools or the Query API. This is only supported through the SOAP API.
Instance limit New users are limited to a maximum of 20 concurrent instances, but many of our customers use hundreds or thousands of instances. If you need a higher limit, go to
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