NCQ enabled, 46 disks
2 streams, 1 thread per stream

heavy# zpool iostat 1
               capacity     operations    bandwidth
pool         used  avail   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
...
test        80.0G  20.8T    289      0  35.8M      0
test        80.0G  20.8T      0      0      0      0
test        80.0G  20.8T  8.79K      0  1.09G      0
test        80.0G  20.8T  11.2K      0  1.40G      0
test        80.0G  20.8T  11.1K      0  1.39G      0
test        80.0G  20.8T  12.0K      0  1.49G      0
test        80.0G  20.8T  12.0K      0  1.50G      0
test        80.0G  20.8T  11.2K      0  1.40G      0
test        80.0G  20.8T  10.8K      0  1.35G      0
test        80.0G  20.8T  10.7K      0  1.34G      0
test        80.0G  20.8T  11.9K      0  1.49G      0
test        80.0G  20.8T  11.1K      0  1.39G      0
test        80.0G  20.8T  10.9K      0  1.37G      0
test        80.0G  20.8T  11.4K      0  1.42G      0
test        80.0G  20.8T  11.2K      0  1.40G      0
test        80.0G  20.8T  11.8K      0  1.48G      0
test        80.0G  20.8T  11.6K      0  1.45G      0
test        80.0G  20.8T  11.9K      0  1.48G      0
test        80.0G  20.8T  11.8K      0  1.48G      0
test        80.0G  20.8T  10.7K      0  1.33G      0
test        80.0G  20.8T  9.91K      0  1.24G      0
test        80.0G  20.8T  10.2K      0  1.27G      0
test        80.0G  20.8T  11.2K      0  1.40G      0
test        80.0G  20.8T  12.0K      0  1.50G      0
test        80.0G  20.8T  11.1K      0  1.39G      0
test        80.0G  20.8T  10.7K      0  1.34G      0
test        80.0G  20.8T  9.84K      0  1.23G      0
test        80.0G  20.8T  11.3K      0  1.41G      0
test        80.0G  20.8T  12.1K      0  1.51G      0
test        80.0G  20.8T  12.0K      0  1.49G      0
test        80.0G  20.8T  11.9K      0  1.49G      0
test        80.0G  20.8T  11.2K      0  1.40G      0
test        80.0G  20.8T  11.4K      0  1.43G      0
test        80.0G  20.8T  10.8K      0  1.35G      0
test        80.0G  20.8T  11.1K      0  1.38G      0
test        80.0G  20.8T  11.8K      0  1.47G      0
test        80.0G  20.8T  11.9K      0  1.48G      0
test        80.0G  20.8T  11.8K      0  1.48G      0
test        80.0G  20.8T  10.4K      0  1.29G      0
test        80.0G  20.8T  10.6K      0  1.33G      0
test        80.0G  20.8T  11.9K      0  1.49G      0
test        80.0G  20.8T  11.4K      0  1.42G      0
test        80.0G  20.8T  11.8K      0  1.47G      0
test        80.0G  20.8T  11.3K      0  1.42G      0
test        80.0G  20.8T  10.6K      0  1.33G      0
test        80.0G  20.8T  10.8K      0  1.35G      0
test        80.0G  20.8T  12.0K      0  1.50G      0
test        80.0G  20.8T  11.1K      0  1.39G      0
test        80.0G  20.8T  11.7K      0  1.46G      0
test        80.0G  20.8T  11.9K      0  1.48G      0
test        80.0G  20.8T  11.9K      0  1.49G      0
test        80.0G  20.8T  11.9K      0  1.48G      0
test        80.0G  20.8T  11.2K      0  1.40G      0
test        80.0G  20.8T  11.4K      0  1.43G      0
test        80.0G  20.8T  11.5K      0  1.44G      0
test        80.0G  20.8T  10.4K      0  1.30G      0
test        80.0G  20.8T  10.2K      0  1.28G      0
test        80.0G  20.8T  11.3K      0  1.41G      0
test        80.0G  20.8T  11.0K      0  1.37G      0
test        80.0G  20.8T  11.5K      0  1.44G      0
test        80.0G  20.8T  10.0K      0  1.25G      0
test        80.0G  20.8T  11.8K      0  1.48G      0
test        80.0G  20.8T  11.0K      0  1.37G      0
test        80.0G  20.8T  11.6K      0  1.44G      0
test        80.0G  20.8T  11.4K      0  1.42G      0
test        80.0G  20.8T  11.1K      0  1.39G      0
test        80.0G  20.8T  11.7K      0  1.46G      0
test        80.0G  20.8T  10.6K      0  1.32G      0
test        80.0G  20.8T  10.7K      0  1.34G      0
test        80.0G  20.8T  10.8K      0  1.35G      0
test        80.0G  20.8T  12.0K      0  1.50G      0
test        80.0G  20.8T  11.3K      0  1.42G      0
test        80.0G  20.8T  11.6K      0  1.45G      0
test        80.0G  20.8T  11.3K      0  1.41G      0
test        80.0G  20.8T  10.9K      0  1.36G      0
test        80.0G  20.8T  11.4K      0  1.42G      0
test        80.0G  20.8T  11.6K      0  1.45G      0
test        80.0G  20.8T  11.2K      0  1.40G      0
test        80.0G  20.8T    12K      0  1.50G      0
test        80.0G  20.8T  10.1K      0  1.27G      0
test        80.0G  20.8T  10.3K      0  1.29G      0
test        80.0G  20.8T  10.7K      0  1.33G      0
test        80.0G  20.8T  10.5K      0  1.31G      0
test        80.0G  20.8T  11.9K      0  1.49G      0
test        80.0G  20.8T  11.9K      0  1.49G      0
test        80.0G  20.8T  10.8K      0  1.35G      0
test        80.0G  20.8T  9.73K      0  1.22G      0
test        80.0G  20.8T  11.2K      0  1.40G      0
test        80.0G  20.8T  11.2K      0  1.41G      0
test        80.0G  20.8T  11.5K      0  1.43G      0
test        80.0G  20.8T  11.4K      0  1.42G      0
test        80.0G  20.8T  11.0K      0  1.38G      0
test        80.0G  20.8T  10.6K      0  1.33G      0
test        80.0G  20.8T  10.8K      0  1.35G      0
test        80.0G  20.8T  11.2K      0  1.40G      0
test        80.0G  20.8T  12.1K      0  1.51G      0
test        80.0G  20.8T  11.6K      0  1.45G      0
test        80.0G  20.8T  11.0K      0  1.37G      0
test        80.0G  20.8T  11.3K      0  1.41G      0
test        80.0G  20.8T  11.7K      0  1.46G      0
test        80.0G  20.8T  11.6K      0  1.45G      0
test        80.0G  20.8T  11.5K      0  1.44G      0
test        80.0G  20.8T  11.0K      0  1.38G      0
test        80.0G  20.8T  10.2K      0  1.28G      0
test        80.0G  20.8T  10.7K      0  1.33G      0
test        80.0G  20.8T  10.2K      0  1.27G      0
test        80.0G  20.8T  9.46K      0  1.18G      0
test        80.0G  20.8T  11.6K      0  1.45G      0
test        80.0G  20.8T  10.7K      0  1.34G      0
test        80.0G  20.8T  11.3K      0  1.41G      0
test        80.0G  20.8T  11.7K      0  1.46G      0
test        80.0G  20.8T  11.1K      0  1.39G      0
test        80.0G  20.8T  11.2K      0  1.40G      0
test        80.0G  20.8T  10.9K      0  1.36G      0
test        80.0G  20.8T  11.4K      0  1.43G      0
test        80.0G  20.8T  10.7K      0  1.34G      0
test        80.0G  20.8T  10.2K      0  1.28G      0
test        80.0G  20.8T  9.80K      0  1.22G      0
test        80.0G  20.8T  10.4K      0  1.30G      0
test        80.0G  20.8T  11.1K      0  1.39G      0
test        80.0G  20.8T  11.8K      0  1.48G      0
test        80.0G  20.8T  5.42K      0   694M      0