I am hoping for a little help on my results. I am running two tests specifically against my RAID10 across 8 SAS 15K 900GB drives and not gettting results that i would expect. I am expecting to see better Avg Lat speeds in the 64K test and much closer to the 8K test shown below. It's possible my expectations are out to lunch but any help greatly appreciated. THank you.
C:\Diskspd\amd64\diskspd.exe -b64k -r1M -w100 -o8 -F8 -Suw -L -d600 -c50G D:\DiskspdTest\diskspd.dat
CPU | Usage | User | Kernel | Idle
-------------------------------------------
0| 1.03%| 0.35%| 0.68%| 98.97%
1| 2.04%| 0.96%| 1.08%| 97.96%
2| 1.02%| 0.42%| 0.60%| 98.98%
3| 0.99%| 0.39%| 0.60%| 99.01%
4| 2.52%| 1.41%| 1.11%| 97.48%
5| 1.32%| 0.73%| 0.59%| 98.68%
6| 2.35%| 0.96%| 1.39%| 97.65%
7| 1.61%| 0.79%| 0.82%| 98.39%
-------------------------------------------
avg.| 1.61%| 0.75%| 0.86%| 98.39%
Total IO
thread | bytes | I/Os | MiB/s | I/O per s | AvgLat | LatStdDev | file
-----------------------------------------------------------------------------------------------------
0 | 6272712704 | 95714 | 9.97 | 159.52 | 50.145 | 40.859 | D:\DiskspdTest\diskspd.dat (50GiB)
1 | 6265634816 | 95606 | 9.96 | 159.34 | 50.205 | 40.992 | D:\DiskspdTest\diskspd.dat (50GiB)
2 | 6278152192 | 95797 | 9.98 | 159.66 | 50.103 | 40.841 | D:\DiskspdTest\diskspd.dat (50GiB)
3 | 6308560896 | 96261 | 10.03 | 160.43 | 49.861 | 40.960 | D:\DiskspdTest\diskspd.dat (50GiB)
4 | 6287589376 | 95941 | 9.99 | 159.90 | 50.030 | 41.001 | D:\DiskspdTest\diskspd.dat (50GiB)
5 | 6255149056 | 95446 | 9.94 | 159.08 | 50.289 | 40.910 | D:\DiskspdTest\diskspd.dat (50GiB)
6 | 6273236992 | 95722 | 9.97 | 159.54 | 50.143 | 40.892 | D:\DiskspdTest\diskspd.dat (50GiB)
7 | 6294732800 | 96050 | 10.01 | 160.08 | 49.973 | 40.890 | D:\DiskspdTest\diskspd.dat (50GiB)
-----------------------------------------------------------------------------------------------------
total: 50235768832 | 766537 | 79.85 | 1277.56 | 50.093 | 40.918
C:\Diskspd\amd64\diskspd.exe -b8k -r1M -w100 -o8 -F8 -Suw -L -d600 -c50G D:\DiskspdTest\diskspd.dat
CPU | Usage | User | Kernel | Idle
-------------------------------------------
0| 15.41%| 1.19%| 14.22%| 84.59%
1| 35.94%| 1.75%| 34.19%| 64.06%
2| 15.36%| 1.15%| 14.21%| 84.64%
3| 15.40%| 1.20%| 14.21%| 84.60%
4| 42.06%| 1.83%| 40.23%| 57.94%
5| 16.13%| 1.48%| 14.65%| 83.87%
6| 32.85%| 1.73%| 31.11%| 67.15%
7| 21.15%| 1.60%| 19.55%| 78.85%
-------------------------------------------
avg.| 24.29%| 1.49%| 22.80%| 75.71%
Total IO
thread | bytes | I/Os | MiB/s | I/O per s | AvgLat | LatStdDev | file
-----------------------------------------------------------------------------------------------------
0 | 33980915712 | 4148061 | 54.01 | 6913.26 | 1.157 | 7.335 | D:\DiskspdTest\diskspd.dat (50GiB)
1 | 32891576320 | 4015085 | 52.28 | 6691.63 | 1.195 | 8.284 | D:\DiskspdTest\diskspd.dat (50GiB)
2 | 34043764736 | 4155733 | 54.11 | 6926.04 | 1.154 | 7.336 | D:\DiskspdTest\diskspd.dat (50GiB)
3 | 34049073152 | 4156381 | 54.12 | 6927.12 | 1.154 | 7.342 | D:\DiskspdTest\diskspd.dat (50GiB)
4 | 31274098688 | 3817639 | 49.71 | 6362.57 | 1.257 | 8.841 | D:\DiskspdTest\diskspd.dat (50GiB)
5 | 33991360512 | 4149336 | 54.03 | 6915.38 | 1.156 | 7.357 | D:\DiskspdTest\diskspd.dat (50GiB)
6 | 33952161792 | 4144551 | 53.96 | 6907.41 | 1.157 | 7.322 | D:\DiskspdTest\diskspd.dat (50GiB)
7 | 33777344512 | 4123211 | 53.69 | 6871.84 | 1.164 | 7.536 | D:\DiskspdTest\diskspd.dat (50GiB)
-----------------------------------------------------------------------------------------------------
total: 267960295424 | 32709997 | 425.90 | 54515.25 | 1.173 | 7.673