NCQ disabled, 46 disks
1 stream, 1 thread per stream

heavy# zpool iostat 1
               capacity     operations    bandwidth
pool         used  avail   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
...
test        40.0G  20.8T    143      0  17.8M      0
test        40.0G  20.8T      0      0      0      0
test        40.0G  20.8T  5.35K      0   683M      0
test        40.0G  20.8T  9.72K      0  1.21G      0
test        40.0G  20.8T  9.52K      0  1.19G      0
test        40.0G  20.8T  10.6K      0  1.33G      0
test        40.0G  20.8T  11.1K      0  1.39G      0
test        40.0G  20.8T  8.66K      0  1.08G      0
test        40.0G  20.8T  7.15K      0   915M      0
test        40.0G  20.8T  10.8K      0  1.36G      0
test        40.0G  20.8T  11.1K      0  1.39G      0
test        40.0G  20.8T  10.7K      0  1.34G      0
test        40.0G  20.8T  10.3K      0  1.29G      0
test        40.0G  20.8T  10.7K      0  1.34G      0
test        40.0G  20.8T  10.0K      0  1.26G      0
test        40.0G  20.8T  11.5K      0  1.44G      0
test        40.0G  20.8T  10.4K      0  1.30G      0
test        40.0G  20.8T  9.72K      0  1.21G      0
test        40.0G  20.8T  9.77K      0  1.22G      0
test        40.0G  20.8T  10.4K      0  1.30G      0
test        40.0G  20.8T  9.95K      0  1.24G      0
test        40.0G  20.8T  9.15K      0  1.14G      0
test        40.0G  20.8T  10.9K      0  1.36G      0
test        40.0G  20.8T  9.78K      0  1.22G      0
test        40.0G  20.8T  10.9K      0  1.36G      0
test        40.0G  20.8T  11.4K      0  1.42G      0
test        40.0G  20.8T  10.6K      0  1.33G      0
test        40.0G  20.8T  11.4K      0  1.43G      0
test        40.0G  20.8T  10.1K      0  1.27G      0
test        40.0G  20.8T  10.9K      0  1.36G      0
test        40.0G  20.8T  9.67K      0  1.21G      0
test        40.0G  20.8T  10.4K      0  1.30G      0
test        40.0G  20.8T  9.13K      0  1.14G      0
test        40.0G  20.8T  9.44K      0  1.18G      0
test        40.0G  20.8T  11.1K      0  1.39G      0
test        40.0G  20.8T  11.4K      0  1.42G      0
test        40.0G  20.8T  11.1K      0  1.39G      0
test        40.0G  20.8T  10.3K      0  1.29G      0
test        40.0G  20.8T  11.1K      0  1.39G      0
test        40.0G  20.8T  10.1K      0  1.27G      0
test        40.0G  20.8T  10.0K      0  1.25G      0
test        40.0G  20.8T  11.0K      0  1.38G      0
test        40.0G  20.8T  9.78K      0  1.22G      0
test        40.0G  20.8T  11.5K      0  1.44G      0
test        40.0G  20.8T  9.97K      0  1.25G      0
test        40.0G  20.8T  9.85K      0  1.23G      0
test        40.0G  20.8T  11.6K      0  1.45G      0
test        40.0G  20.8T  10.5K      0  1.31G      0
test        40.0G  20.8T  11.4K      0  1.42G      0
test        40.0G  20.8T  10.6K      0  1.33G      0
test        40.0G  20.8T  10.9K      0  1.36G      0
test        40.0G  20.8T  10.4K      0  1.30G      0
test        40.0G  20.8T  11.2K      0  1.40G      0
test        40.0G  20.8T  10.7K      0  1.34G      0
test        40.0G  20.8T  10.7K      0  1.33G      0
test        40.0G  20.8T  9.54K      0  1.19G      0
test        40.0G  20.8T  10.2K      0  1.27G      0
test        40.0G  20.8T  11.1K      0  1.39G      0
test        40.0G  20.8T  11.3K      0  1.41G      0
test        40.0G  20.8T  9.58K      0  1.20G      0
test        40.0G  20.8T  10.1K      0  1.26G      0
test        40.0G  20.8T  11.6K      0  1.45G      0
test        40.0G  20.8T  11.1K      0  1.38G      0
test        40.0G  20.8T  10.3K      0  1.28G      0
test        40.0G  20.8T  11.5K      0  1.44G      0
test        40.0G  20.8T  9.76K      0  1.22G      0
test        40.0G  20.8T  10.1K      0  1.27G      0
test        40.0G  20.8T  10.6K      0  1.32G      0
test        40.0G  20.8T  11.0K      0  1.37G      0
test        40.0G  20.8T  9.52K      0  1.19G      0
test        40.0G  20.8T  10.5K      0  1.31G      0
test        40.0G  20.8T  6.01K      0   769M      0
test        40.0G  20.8T  10.1K      0  1.26G      0
test        40.0G  20.8T  11.5K      0  1.43G      0
test        40.0G  20.8T  10.4K      0  1.30G      0
test        40.0G  20.8T  9.21K      0  1.15G      0
test        40.0G  20.8T  11.0K      0  1.37G      0
test        40.0G  20.8T  11.3K      0  1.41G      0
test        40.0G  20.8T  10.1K      0  1.27G      0
test        40.0G  20.8T  9.88K      0  1.23G      0
test        40.0G  20.8T  11.1K      0  1.39G      0
test        40.0G  20.8T  11.2K      0  1.40G      0
test        40.0G  20.8T  11.4K      0  1.42G      0
test        40.0G  20.8T  9.65K      0  1.21G      0
test        40.0G  20.8T  9.72K      0  1.21G      0
test        40.0G  20.8T  11.1K      0  1.38G      0
test        40.0G  20.8T  11.4K      0  1.42G      0
test        40.0G  20.8T  10.4K      0  1.30G      0
test        40.0G  20.8T  10.2K      0  1.27G      0
test        40.0G  20.8T  10.6K      0  1.33G      0
test        40.0G  20.8T  9.45K      0  1.18G      0
test        40.0G  20.8T  9.85K      0  1.23G      0
test        40.0G  20.8T  11.4K      0  1.43G      0
test        40.0G  20.8T  10.7K      0  1.34G      0
test        40.0G  20.8T  11.1K      0  1.39G      0
test        40.0G  20.8T  11.4K      0  1.42G      0
test        40.0G  20.8T  10.8K      0  1.35G      0
test        40.0G  20.8T  10.3K      0  1.28G      0
test        40.0G  20.8T  10.8K      0  1.35G      0
test        40.0G  20.8T  11.1K      0  1.39G      0
test        40.0G  20.8T  11.5K      0  1.44G      0
test        40.0G  20.8T  8.88K      0  1.11G      0
test        40.0G  20.8T  11.2K      0  1.40G      0
test        40.0G  20.8T  10.9K      0  1.36G      0
test        40.0G  20.8T  10.4K      0  1.30G      0
test        40.0G  20.8T  9.96K      0  1.24G      0
test        40.0G  20.8T  9.60K      0  1.20G      0
test        40.0G  20.8T  10.3K      0  1.29G      0
test        40.0G  20.8T  9.80K      0  1.22G      0
test        40.0G  20.8T  11.1K      0  1.39G      0
test        40.0G  20.8T  10.8K      0  1.35G      0
test        40.0G  20.8T  10.4K      0  1.30G      0
test        40.0G  20.8T  11.3K      0  1.42G      0
test        40.0G  20.8T  10.9K      0  1.36G      0
test        40.0G  20.8T  10.1K      0  1.26G      0
test        40.0G  20.8T  10.9K      0  1.36G      0
test        40.0G  20.8T  10.7K      0  1.34G      0
test        40.0G  20.8T  10.2K      0  1.27G      0
test        40.0G  20.8T  10.8K      0  1.35G      0
test        40.0G  20.8T  10.0K      0  1.25G      0
test        40.0G  20.8T  11.1K      0  1.39G      0
test        40.0G  20.8T  10.6K      0  1.32G      0