RAID 4...

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Analysis  Intel IOMeter - SuperTrak-100 RAID 4 w/ 3 Drives  Analysis

1 worker, 10 minutes, 30 second rampup All Loads Linear Very Light Light Moderate Heavy File Server Access Pattern StorageReview.com Total I/Os per second 60.25 60.53 66.74 73.06 80.46 Total MBs per second 0.64 0.65 0.73 0.79 0.87 Average I/O Response Time (ms) 16.59 66.08 239.72 875.43 3172.52 CPU Utilization (%) 0.55 0.68 0.78 0.81 1.14 I/Os per % CPU Utilization 109.55 89.01 85.56 90.20 70.58 Workstation Access Pattern StorageReview.com Total I/Os per second 69.22 69.49 76.12 83.34 91.64 Total MBs per second 0.54 0.54 0.59 0.65 0.72 Average I/O Response Time (ms) 14.44 57.55 210.18 767.46 2788.70 CPU Utilization (%) 0.71 0.79 0.85 0.88 1.32 I/Os per % CPU Utilization 97.49 87.96 89.55 94.70 69.42 Database Access Pattern StorageReview.com Total I/Os per second 63.07 63.65 68.65 74.17 80.57 Total MBs per second 0.49 0.50 0.54 0.58 0.63 Average I/O Response Time (ms) 15.85 62.84 232.99 862.25 3168.00 CPU Utilization (%) 0.67 0.70 0.79 0.91 1.16 I/Os per % CPU Utilization 94.13 90.93 86.90 81.51 69.46 Random Write Pattern StorageReview.com Total I/Os per second 64.62 65.37 71.65 76.32 81.08 Total MBs per second 0.50 0.51 0.56 0.60 0.63 Average I/O Response Time (ms) 15.47 61.17 223.21 838.11 3150.54 CPU Utilization (%) 0.68 0.70 0.80 0.82 1.14 I/Os per % CPU Utilization 95.03 93.39 89.56 93.07 71.12 Sequential Write Pattern StorageReview.com Total I/Os per second 27.47 27.55 27.55 27.55 27.01 Total MBs per second 6.87 6.89 6.89 6.89 6.75 Average I/O Response Time (ms) 36.40 145.17 580.73 2323.08 8538.92 CPU Utilization (%) 1.13 1.11 1.20 1.78 1.49 I/Os per % CPU Utilization 24.31 24.82 22.96 15.48 18.13

Analysis  Intel IOMeter - SuperTrak-100 RAID 4 w/ 4 Drives  Analysis

1 worker, 10 minutes, 30 second rampup All Loads Linear Very Light Light Moderate Heavy File Server Access Pattern StorageReview.com Total I/Os per second 59.43 59.68 64.73 71.63 80.27 Total MBs per second 0.64 0.65 0.70 0.77 0.87 Average I/O Response Time (ms) 16.82 67.01 247.11 893.08 3181.62 CPU Utilization (%) 0.55 0.70 0.79 0.85 1.20 I/Os per % CPU Utilization 108.05 85.26 81.94 84.27 66.89 Workstation Access Pattern StorageReview.com Total I/Os per second 68.05 68.35 73.32 80.89 89.83 Total MBs per second 0.53 0.53 0.57 0.63 0.70 Average I/O Response Time (ms) 14.69 58.51 218.14 790.54 2843.64 CPU Utilization (%) 0.69 0.77 0.89 0.88 1.18 I/Os per % CPU Utilization 98.62 88.77 82.38 91.92 76.13 Database Access Pattern StorageReview.com Total I/Os per second 61.92 61.87 66.29 72.16 80.09 Total MBs per second 0.48 0.48 0.52 0.56 0.63 Average I/O Response Time (ms) 16.15 64.65 241.34 886.31 3189.88 CPU Utilization (%) 0.67 0.67 0.79 0.84 1.10 I/Os per % CPU Utilization 92.42 92.34 83.91 85.90 72.81 Random Write Pattern StorageReview.com Total I/Os per second 60.18 61.91 68.62 73.85 78.38 Total MBs per second 0.47 0.48 0.54 0.58 0.61 Average I/O Response Time (ms) 16.61 64.61 233.07 866.13 3259.21 CPU Utilization (%) 0.58 0.69 0.73 0.89 1.05 I/Os per % CPU Utilization 103.76 89.72 94.00 82.98 74.65 Sequential Write Pattern StorageReview.com Total I/Os per second 31.45 31.55 31.56 31.56 30.67 Total MBs per second 7.86 7.89 7.89 7.89 7.67 Average I/O Response Time (ms) 31.79 126.77 506.88 2027.80 7520.44 CPU Utilization (%) 1.26 1.23 1.31 1.69 1.53 I/Os per % CPU Utilization 24.96 25.65 24.09 18.67 20.05

While the SuperTrak's RAID 4 scores improve over RAID 3, results are still significantly worse than that of a single drive. There's virtually no performance improvement when moving from three to four drives... something that should surprise no one by this point.

 Conclusion...