The term IOPS (pronounced eye-ops), which is an abbreviation for Input/Output Operations Per Second, is a performance benchmark used to measure the speed and efficiency of storage devices. This benchmark is commonly used on hard disk drives, solid-state drives, and storage area networks. Examples of software that measure IOPS include the applications Iometer, IOzone, and FIO.
How does it work?
While being benchmarked, the storage device is tested for sequential access (reading and writing data at consecutive locations on the physical medium) and random access (reading and writing at scattered locations on the medium). The average of these results is the total IOPS for the device.