Patent ID: 8284627

Claim:
A method, comprising: receiving data access information of a storage extent stored in a storage system and utilization information of storage devices in the storage system, wherein the storage system comprises a plurality of storage tiers and each of the plurality of storage tiers comprises a plurality of storage devices; estimating storage resources required for each of the plurality of the storage tiers to satisfy the storage extent's performance and capacity requirements, wherein estimation of said storage resources is based on said data access information; determining which one of the plurality of storage tiers would incur the lowest power consumption to the storage system for satisfying the storage extent's performance and capacity requirements, wherein said one storage tier is determined by calculating the amount of power that would be consumed by the storage extent in each of the plurality of storage tiers based on said estimated storage resources; determining at least one storage device (among the plurality of storage devices) in said one storage tier that has available storage resources that would satisfy the storage extent's performance and capacity requirements, wherein said determination of said at least one storage device is based on said data access information and utilization information; and allocating the storage extent to said one storage tier and to one storage device (among the at least one storage device) that has the least amount of available storage capacity.