Amazon EC2 lets users reserve EC2 instances. When a Reserved Instance is created, it is valid only for instances of the specific instance type (i.e.
m1.Medium) and zone (i.e.
us-east-1d). How can I be sure when launching a new instance that I am selecting the correct Type and Zone so that the reserved instance will be used?
Note that I did find a similar question but it seems that question is asking (and indeed, the answer fits) how to be sure that an already running instance is using the Reserved Instance. My question is how to start a new instance such that I can be sure that it will use a Reserved Instance. There are many instance types to choose from with similar names (m1.Medium, m2.Medium, m2.Micro), and there are many "sub zones" that are easily confused (us-east-1b, us-east-1c, us-east-1d). At best the use must open two windows so that he could meticulously compare his available reserved instances with the options on the Launch Instance screen.