4K Random Read/Write
Each QD for every parameter tested includes 300 data points (five minutes of one second reports) to illustrate the degree of performance variability. The line for each QD represents the average speed reported during the five-minute interval.
4K random speed measurements are an important metric when comparing drive performance, as the hardest type of file access for any storage solution to master is small-file random. One of the most sought-after performance specifications, 4K random performance is a heavily marketed figure.
The read performance scales well, with a nice tight distribution of performance. We can observe that the 8-drive configuration averages 4,100 IOPS, the 5 drive 2,500 IOPS and the 3-drive configuration averages 1,600 IOPS.
The 8-drive configuration, in dark blue, dominates the write testing. The 3 and 5 drive raidsets perform well, but do not scale as well at the lower queue depths. The 8-drive configuration tops out at an average of 1053 IOPS at QD 256, 5 drives come in at 600 IOPS, and the 3 drive musters 511 IOPS.