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

heavy# zpool iostat 1
               capacity     operations    bandwidth
pool         used  avail   read  write   read  write
----------  -----  -----  -----  -----  -----  -----
...
test         160G  20.7T    576      0  71.2M      0
test         160G  20.7T      3      0   507K      0
test         160G  20.7T    591      0  73.8M      0
test         160G  20.7T  10.6K      0  1.32G      0
test         160G  20.7T  11.6K      0  1.45G      0
test         160G  20.7T  11.5K      0  1.43G      0
test         160G  20.7T  11.9K      0  1.49G      0
test         160G  20.7T  11.7K      0  1.46G      0
test         160G  20.7T  11.8K      0  1.47G      0
test         160G  20.7T  9.91K      0  1.24G      0
test         160G  20.7T  11.5K      0  1.43G      0
test         160G  20.7T  11.9K      0  1.49G      0
test         160G  20.7T  10.3K      0  1.29G      0
test         160G  20.7T  11.5K      0  1.43G      0
test         160G  20.7T  10.8K      0  1.35G      0
test         160G  20.7T  11.1K      0  1.39G      0
test         160G  20.7T  12.0K      0  1.50G      0
test         160G  20.7T  11.0K      0  1.38G      0
test         160G  20.7T  11.2K      0  1.39G      0
test         160G  20.7T  11.4K      0  1.43G      0
test         160G  20.7T  11.4K      0  1.43G      0
test         160G  20.7T  11.5K      0  1.44G      0
test         160G  20.7T  11.6K      0  1.45G      0
test         160G  20.7T  11.7K      0  1.46G      0
test         160G  20.7T  11.5K      0  1.43G      0
test         160G  20.7T  11.6K      0  1.44G      0
test         160G  20.7T  11.7K      0  1.46G      0
test         160G  20.7T  11.6K      0  1.45G      0
test         160G  20.7T  11.9K      0  1.49G      0
test         160G  20.7T  11.4K      0  1.43G      0
test         160G  20.7T  11.4K      0  1.42G      0
test         160G  20.7T  11.4K      0  1.42G      0
test         160G  20.7T  11.6K      0  1.45G      0
test         160G  20.7T  10.8K      0  1.36G      0
test         160G  20.7T  11.9K      0  1.48G      0
test         160G  20.7T  11.4K      0  1.43G      0
test         160G  20.7T  11.8K      0  1.47G      0
test         160G  20.7T  11.8K      0  1.48G      0
test         160G  20.7T  11.5K      0  1.44G      0
test         160G  20.7T  11.5K      0  1.44G      0
test         160G  20.7T  11.3K      0  1.42G      0
test         160G  20.7T  11.6K      0  1.45G      0
test         160G  20.7T  11.5K      0  1.44G      0
test         160G  20.7T  11.2K      0  1.40G      0
test         160G  20.7T  11.7K      0  1.46G      0
test         160G  20.7T  11.5K      0  1.43G      0
test         160G  20.7T  11.8K      0  1.47G      0
test         160G  20.7T  10.6K      0  1.32G      0
test         160G  20.7T  11.4K      0  1.42G      0
test         160G  20.7T  11.7K      0  1.46G      0
test         160G  20.7T  11.6K      0  1.45G      0
test         160G  20.7T  10.9K      0  1.37G      0
test         160G  20.7T  12.1K      0  1.51G      0
test         160G  20.7T  10.8K      0  1.35G      0
test         160G  20.7T  11.2K      0  1.40G      0
test         160G  20.7T  11.2K      0  1.40G      0
test         160G  20.7T  11.6K      0  1.44G      0
test         160G  20.7T  11.6K      0  1.45G      0
test         160G  20.7T  11.6K      0  1.45G      0
test         160G  20.7T  11.5K      0  1.43G      0
test         160G  20.7T  11.3K      0  1.41G      0
test         160G  20.7T  11.4K      0  1.42G      0
test         160G  20.7T  10.8K      0  1.35G      0
test         160G  20.7T  11.1K      0  1.39G      0
test         160G  20.7T  11.3K      0  1.41G      0
test         160G  20.7T  11.2K      0  1.40G      0
test         160G  20.7T  12.1K      0  1.51G      0
test         160G  20.7T  11.6K      0  1.45G      0
test         160G  20.7T  10.9K      0  1.36G      0
test         160G  20.7T  11.6K      0  1.45G      0
test         160G  20.7T  9.67K      0  1.21G      0
test         160G  20.7T  12.0K      0  1.50G      0
test         160G  20.7T  11.6K      0  1.45G      0
test         160G  20.7T  11.8K      0  1.47G      0
test         160G  20.7T  11.4K      0  1.43G      0
test         160G  20.7T  11.4K      0  1.42G      0
test         160G  20.7T  11.4K      0  1.42G      0
test         160G  20.7T  11.8K      0  1.48G      0
test         160G  20.7T  11.7K      0  1.47G      0
test         160G  20.7T  11.5K      0  1.44G      0
test         160G  20.7T  11.7K      0  1.47G      0
test         160G  20.7T  11.6K      0  1.45G      0
test         160G  20.7T  11.7K      0  1.47G      0
test         160G  20.7T  11.5K      0  1.43G      0
test         160G  20.7T  11.5K      0  1.43G      0
test         160G  20.7T  11.0K      0  1.37G      0
test         160G  20.7T  11.3K      0  1.41G      0
test         160G  20.7T  11.7K      0  1.46G      0
test         160G  20.7T  11.3K      0  1.41G      0
test         160G  20.7T  11.5K      0  1.44G      0
test         160G  20.7T  10.6K      0  1.32G      0
test         160G  20.7T  11.7K      0  1.47G      0
test         160G  20.7T  11.7K      0  1.46G      0
test         160G  20.7T  11.1K      0  1.39G      0
test         160G  20.7T  11.1K      0  1.39G      0
test         160G  20.7T  10.7K      0  1.34G      0
test         160G  20.7T  11.3K      0  1.42G      0
test         160G  20.7T  11.7K      0  1.46G      0
test         160G  20.7T  11.7K      0  1.46G      0
test         160G  20.7T  11.0K      0  1.38G      0
test         160G  20.7T  11.0K      0  1.37G      0
test         160G  20.7T  10.6K      0  1.33G      0
test         160G  20.7T  11.6K      0  1.45G      0
test         160G  20.7T  10.9K      0  1.36G      0
test         160G  20.7T  11.4K      0  1.43G      0
test         160G  20.7T  11.6K      0  1.44G      0
test         160G  20.7T  11.4K      0  1.43G      0
test         160G  20.7T  11.9K      0  1.49G      0
test         160G  20.7T  12.0K      0  1.51G      0
test         160G  20.7T  11.7K      0  1.46G      0
test         160G  20.7T  11.3K      0  1.41G      0
test         160G  20.7T  10.7K      0  1.33G      0
test         160G  20.7T  10.5K      0  1.32G      0
test         160G  20.7T  12.1K      0  1.51G      0
test         160G  20.7T  12.3K      0  1.54G      0
test         160G  20.7T  11.2K      0  1.41G      0
test         160G  20.7T  11.8K      0  1.48G      0
test         160G  20.7T  11.7K      0  1.47G      0
test         160G  20.7T  11.6K      0  1.46G      0
test         160G  20.7T  11.4K      0  1.42G      0
test         160G  20.7T  11.2K      0  1.40G      0
test         160G  20.7T  11.9K      0  1.48G      0
test         160G  20.7T  6.06K      0   776M      0