Amazon EC2 AMIs can now be backed by Amazon EBS, which are easier to create than AMIs that use instance stores as root devices, launch faster, support sizes up to 1 TiB, and use persistent storage. For more information about AMIs, go to the Amazon Elastic Compute Cloud Developer Guide or Amazon Elastic Compute Cloud User Guide.
|Amazon EC2 in Northern California||
Amazon EC2 is now available in Northern California. For more information, go to the Amazon Elastic Compute Cloud Detail Page.
|Query Version of ModifyInstanceAttribute||The Query API ModifyInstanceAttribute request does not allow the block-device-mappings to be modified and the user-data attribute cannot be modified if it already contains data.|
|Paid AMIs Backed by Amazon EBS||AMIs backed by Amazon EBS are not currently supported by Amazon DevPay.|
|Windows Reserved Instances||Reserved Instances are not currently available for Windows.|
|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.|
|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.|