Input/output (‘I/O’) in a storage system that includes multiple types of storage devices

An apparatus for writing data in a storage system that includes a first type of storage device and a second type of storage device, the apparatus comprising a computer processor, a computer memory operatively coupled to the computer processor, the computer memory having disposed within it computer program instructions that, when executed by the computer processor, cause the apparatus to carry out the steps of:

• selecting, for one or more unprocessed write requests, a target storage device type from the first type of storage device and the second type of storage device;
• responsive to selecting the first type of storage device, issuing, by a storage array controller, a first group of write requests to the first type of storage device, wherein the first type of storage device performs one or more address translations of the first group of write requests addressed to one or more logical addresses and wherein the first group of write requests are addressed to one or more logical addresses selected in dependence upon an expected address translation to be performed by the first type of storage device.

A computer program product for writing data in a storage system that includes a first type of storage device and a second type of storage device, the computer program product disposed upon a non-transitory, computer readable medium, the computer program product comprising computer program instructions that, when executed, cause a computer to carry out the steps of:

• selecting, for one or more unprocessed write requests, a target storage device type from the first type of storage device and the second type of storage device;
• responsive to selecting the first type of storage device, issuing, by a storage array controller, a first group of write requests to the first type of storage device, wherein the first type of storage device performs one or more address translations of the first group of write requests addressed to one or more logical addresses and wherein the first group of write requests are addressed to one or more logical addresses selected in dependence upon an expected address translation to be performed by the first type of storage device.