Diskspd Is a test tool for IO. Diskspd (version 2.0.17) combines robust and granular IO workload definition with flexible runtime and output options, creating an ideal tool for synthetic storage subsystem testing and validation.

In this test, the Block size to 8K. The test runs for 60 secs with all hardware and software caching disabled. It measure and display latency statistics, leverage 2 overlapped IOs and 4 threads per target, random 30% writes and 70% reads and create a 50MB test file at z:\test.dat

Here are the results for the Seagate ST8000VN0002

Average CPU utilisation = 10.36%

Total IO = 35.83 MB/s, Avg Latency 1.741, 4585.93 IOPs

Read IO = 25.10 MB/s, Avg Latency 1.733, 3213.24 IOPs

Write IO = 10.72 MB/s, Avg Latency 1.760, 1372.69 IOPs

As for WD WD30EFRX

Here are the results for the WesternDigital WD30EFRX

Average CPU utilisation = 9.27%

Total IO = 29.87MB/s, Avg Latency 2.089, 3822.73 IOPs

Read IO = 20.91MB/s, Avg Latency 2.070, 2676.42 IOPs

Write IO = 8.96 MB/s, Avg Latency 2.133, 1146.31 IOPs

From the benchmark data, the Seagate ST8000VN0002 is far better in terms of  IO which can be seen in it’s various departments of read, write and total io in terms of the IO per sec and megabyte transfer per second.

The average latency is also lower on the Seagate ST8000VN0002 at 1.7~ compared to 2.0~ on the WD drives.