Azure Virtual HD on Windows 10 as C: - Maximum Reading Speed

Q

What is maximum reading speed of the Azure Virtual HD on Windows 10 as the system drive "C:"?

✍: FYIcenter.com

A

The best way to find out the maximum reading speed of your Azure Virtual HD as the system drive "C:" is to run reading tests with a single large block of different block sizes:

sqlio -LS -kR -i1 -f1 -t1 -s30 -p0 ...

If we run SQLIO with above options and different block sizes, we should be able to find the maximum reading speed:

             Throughput   Throughput   Latency
Block Size      MBs/sec      IOs/sec        ms
----------   ----------   ----------   -------
      -b16       157.51     10080.77         0
      -b64       536.46      8583.41         0
     -b256      1422.54      5690.16         0
    -b1024      2581.06      2581.06         0
    -b4096      3134.06       783.51         0
   -b16384      3904.09       244.00         3
   -b65536      3685.33        57.58        16
  -b262144      3448.11        13.46        73

As you can see, the maximum reading speed, 3904.09 MBs/sec is reached with a block size of "-b16384", or 16 MB. Azure Virtual HD reading speed is definitely better than any regular hard disks.

 

Azure Virtual HD on Windows 10 as C: - Maximum Writing Speed

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2019-06-29, 172👍, 0💬