Fio brandswitch measure

Question

In disk benchmarking tool fio there is statistics for brandswitch

Run status group 0 (all jobs):
   READ: bw=20.9MiB/s (21.9MB/s), 10.4MiB/s-10.8MiB/s (10.9MB/s-11.3MB/s), io=64.0MiB (67.1MB), run=2973-3069msec

According for docs:

Values outside of brackets are power-of-2 format and those within are the equivalent value in a power-of-10 format.

As far as I know 1 MB/s = 8MiB/s. But here 20.9MiB/s complies to 21.9MB/s.

Answer 1

"1 MB/s = 8MiB/s" is not true. 1MiB is equal to 1.024MB, or 1 MB is ~ 0.9537 MiB.

Both are measurements of bytes.

One byte is certainly 8 bits, which is why it is also known as an octet. But none of these measurements reference bits. They are all bytes.