IOPS (input/output operations per second) is the standard unit of measurement for the maximum number of reads and writes to non-contiguous storage locations. IOPS is pronounced EYE-OPS.
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IOPs is often measured with an open source network testing tool called an Iometer. Measuring both IOPS and latency can help a network administrator predict how much load a network can handle without performance being negatively affected.
See also: load testing