Reserve commit refers to the amount of storage capacity that a customer subscribes to as part of the Evergreen//Flex subscription. The reserve commit must meet the minimum level specified for the chosen hardware configuration and can be increased anytime during the Evergreen//Flex contract term. The reserve commit is billed in advance at the corresponding reserve rate.
On-demand usage is the capacity consumed above the reserve commitment and is billed in arrears at the corresponding on-demand rate.