IOPS (I/Os per Second) Test
The IOPS test measures the random IO performance covering a broad range of R/W (Read/Write) and Block Size combinations of interest to most users. 7 R/W mixes ranging from 100% Read to 100% Write, and 8 Block Sizes ranging from 0.5KiB to 1024 KiB are used. Using the table and/or the 2D and 3D plots provided in the SNIA Report template, the user can quickly retrieve the performance values of interest.
The general IOPS test sequence is:
Note that the Steady State Measurement Window (the portion of data that is used to determine conformance to Steady State) is made up of 5 “Rounds”. A “Round” is defined by a single sweep through the 56 element Block Size x R/W mix matrix (8 Block Sizes: 0.5, 4, 8, 16, 32, 64, 128 and 1024 KiB and 7 R/W Mixes: 0/100, 5/95, 35/65, 50/50, 65/35, 95/5 and 100/0). Each Block Size R/W combination is tested for one minute resulting in a single Round test time of 56 minutes.
Benefits of IOPS Test:
IOPS vs R/W & Block Size Charts Give Good Overview: The 2D and 3D charts provided in the SNIA report template provide an at-a-glance view of the drive’s overall performance. In particular, the user can easily identify regions that relate to read/write performance parity as well as small to large block performance differences.