|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.
|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 http://www.amazon.com/gp/html-forms-controller/ec2-request.|