Experimental IOMeter Indices
Our File Server, Workstation, and Database IOMeter access patterns play through on all tested drives at queue depths of 1, 4, 16, 64, and 256. To simplify this intimidating benchmark, we introduced the IOMeter indices, a normalized average of results drawn from 16 I/Os, 64 I/Os, and 256 I/Os. Why normalized? Result under a load of 256 I/Os on a given drive are always higher than those drawn under 64 I/Os. Correspondingly, 64 I/O results are always greater than those of 16 I/Os. Normalization simply entails multiplying the lower load scores by a coefficient to bring their weight in line when averaging.
Running some raw trace files through IPEAK's AnalyzeTrace suggests that lower-load results are more relevant to single-user disk performance. As a result, we've normalized and averaged results from 1 I/O, 4 I/O, and 16 I/O loads under an "experimental" index. A full sort of all tested drives may be found here.