Do Reserved Instance guarantee capacity?

Question

Muthuvel Chinnusamy · Accepted Answer

Reserved instance in aws is primarily a billing discount(upto 72%) compared to on demand instance and can be purchased for 1 to 3 yrs, but not a capacity reservation, where as on demand capacity reservation provides guarantee capacity.

Muthuvel Chinnusamy · Answer

Reserved instance guarantee capacity if they are only purchased for a specific Availability Zone. Regional reserved instance which offer greater flexibility across AZs, do not offer guarantee capacity. Its servicing primarily as a billing discount.

Do Reserved Instance guarantee capacity?

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