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We should support the BlockDeviceMappings for AWS::AutoScaling::LaunchConfiguration resource to be compatible with AWSCloudFormation. And therefore, user can specify volumes to attach to instances while AutoScalingGroup/InstanceGroup creation.
Now in Heat, the AWS::AutoScaling::LaunchConfiguration resource doesn’t implement ‘BlockDeviceMappings’ property to indicate the volumes to be attached. There are two problems:
1. First, it’s incompatible with AWSCloudFormation. In AWSCloudFormation, ‘BlockDeviceMappings’ support the ‘SnapshotId’, user can specify a snapshot, then a volume will be created from the snapshot, and the volume will be attached to the instance.
2. Second, user can’t specify volumes to be attached to instances which in AutoScalingGroup/InstanceGroup while creation.
So, we should support the ‘BlockDeviceMappings’ for AWS::AutoScaling::LaunchConfiguration.