Earlier this year, Amazon Web Services announced the availability of longer EC2 and EBS resource IDs. Due to the importance of this transition, a large number of customers have already started using the longer format. We strongly recommend that you begin testing your systems with longer resource IDs and opting into the longer ID format as soon as possible. Note that starting in early December, all newly created instances, reservations, volumes, and snapshots will be required to use the longer ID format. By testing and opting in now, you give yourself valuable time in the event that you need to make a modification to your instances utilizing short resource IDs and you minimize the risk of a negative impact to your systems.