[nkvoll]

What you're saying is not really correct.

You cannot just "buy a second 2xlarge" and then recombine them into a 4xlarge. The 2xlarge reservations and pay attention here need to match on their purchase date and hour. I.e they have to be bought within the same clock hour on the same day.

If you reserved a 2xlarge at 2014-12-01T22:59:59Z, you couldn't even combine it with one bought at 2014-12-01T23:00:01Z. Yes Amazon is that picky about it. While you might be able to muscle that through a sales contact, it's not even available to customers on business level support, so anything more than a day apart and you're likely out of luck in any case.

(See: http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ri-modify..., particularly bullet point #6)

[cheald]

Ah, I didn't realize this. Wow, that's...restrictive. Thanks for the info.