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You're not understanding me. If I have a Reserved Instance already paid for and tell Amazon that I want a Spot Instance, I'll be charged the Spot Instance pric
by cperciva 11y ago
You're not understanding me. If I have a Reserved Instance already paid for and tell Amazon that I want a Spot Instance, I'll be charged the Spot Instance price for it. What I'm saying is that launching a spot instance should use my idle RI capacity and bill me as if I had launched those instances as on-demand.
- samstave 11y agoI understand you, but that is an incorrect assumption. Aws has resources. They are priced at X. If you buy on demand, you pay X If you buy an RI, you pay X-[Ri discount] If you launch an instance, and you have an RI that applies, you get the discount. Spot instances are a diff game. Spot and RI are mutually exclusive when costing. Spot is only affected by capacity when it comes to RIs. If you have RIs, you can't swap a running instance between spot or RI or OD pricing... Aws calls this "lifecycle" - spot or normal. RI discount "coupons" only apply to an instance in the same zone on normal lifecycle that can receive the available RI pricing discount. They do not overlap...