NCQ disabled, 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  4.52K      0   577M      0
test         160G  20.7T  11.3K      0  1.41G      0
test         160G  20.7T  12.6K      0  1.57G      0
test         160G  20.7T  13.7K      0  1.71G      0
test         160G  20.7T  14.2K      0  1.78G      0
test         160G  20.7T  11.0K      0  1.38G      0
test         160G  20.7T  13.7K      0  1.71G      0
test         160G  20.7T  14.0K      0  1.75G      0
test         160G  20.7T  13.8K      0  1.72G      0
test         160G  20.7T  13.3K      0  1.66G      0
test         160G  20.7T  14.0K      0  1.75G      0
test         160G  20.7T  14.0K      0  1.75G      0
test         160G  20.7T  13.4K      0  1.67G      0
test         160G  20.7T  13.5K      0  1.68G      0
test         160G  20.7T  13.9K      0  1.74G      0
test         160G  20.7T  13.7K      0  1.71G      0
test         160G  20.7T  13.7K      0  1.71G      0
test         160G  20.7T  13.5K      0  1.69G      0
test         160G  20.7T  13.8K      0  1.72G      0
test         160G  20.7T  14.5K      0  1.81G      0
test         160G  20.7T  14.6K      0  1.82G      0
test         160G  20.7T  14.0K      0  1.76G      0
test         160G  20.7T  13.9K      0  1.73G      0
test         160G  20.7T  14.0K      0  1.75G      0
test         160G  20.7T  13.7K      0  1.72G      0
test         160G  20.7T  14.2K      0  1.78G      0
test         160G  20.7T  14.2K      0  1.77G      0
test         160G  20.7T  14.3K      0  1.78G      0
test         160G  20.7T  13.5K      0  1.69G      0
test         160G  20.7T  14.0K      0  1.75G      0
test         160G  20.7T  13.8K      0  1.72G      0
test         160G  20.7T  13.6K      0  1.70G      0
test         160G  20.7T  13.7K      0  1.71G      0
test         160G  20.7T  13.6K      0  1.70G      0
test         160G  20.7T  14.0K      0  1.74G      0
test         160G  20.7T  14.3K      0  1.79G      0
test         160G  20.7T  14.0K      0  1.75G      0
test         160G  20.7T  14.3K      0  1.78G      0
test         160G  20.7T  14.6K      0  1.82G      0
test         160G  20.7T  14.3K      0  1.79G      0
test         160G  20.7T  14.4K      0  1.80G      0
test         160G  20.7T  13.7K      0  1.72G      0
test         160G  20.7T  14.2K      0  1.77G      0
test         160G  20.7T  14.1K      0  1.76G      0
test         160G  20.7T  14.3K      0  1.79G      0
test         160G  20.7T  13.7K      0  1.71G      0
test         160G  20.7T  13.9K      0  1.74G      0
test         160G  20.7T  13.6K      0  1.70G      0
test         160G  20.7T  13.7K      0  1.71G      0
test         160G  20.7T  13.3K      0  1.66G      0
test         160G  20.7T  13.9K      0  1.73G      0
test         160G  20.7T  14.1K      0  1.77G      0
test         160G  20.7T  14.0K      0  1.75G      0
test         160G  20.7T  14.1K      0  1.76G      0
test         160G  20.7T  14.3K      0  1.79G      0
test         160G  20.7T  14.5K      0  1.82G      0
test         160G  20.7T  13.9K      0  1.74G      0
test         160G  20.7T  13.3K      0  1.66G      0
test         160G  20.7T  13.9K      0  1.73G      0
test         160G  20.7T  13.8K      0  1.72G      0
test         160G  20.7T  13.5K      0  1.69G      0
test         160G  20.7T  13.7K      0  1.72G      0
test         160G  20.7T  13.8K      0  1.72G      0
test         160G  20.7T  13.7K      0  1.71G      0
test         160G  20.7T  13.8K      0  1.73G      0
test         160G  20.7T  12.1K      0  1.51G      0
test         160G  20.7T  13.4K      0  1.68G      0
test         160G  20.7T  13.8K      0  1.73G      0
test         160G  20.7T  13.7K      0  1.72G      0
test         160G  20.7T  13.9K      0  1.73G      0
test         160G  20.7T  14.5K      0  1.82G      0
test         160G  20.7T  14.5K      0  1.81G      0
test         160G  20.7T  14.2K      0  1.77G      0
test         160G  20.7T  14.5K      0  1.81G      0
test         160G  20.7T  14.0K      0  1.75G      0
test         160G  20.7T  14.1K      0  1.77G      0
test         160G  20.7T  14.6K      0  1.83G      0
test         160G  20.7T  14.1K      0  1.77G      0
test         160G  20.7T  14.0K      0  1.75G      0
test         160G  20.7T  12.2K      0  1.53G      0
test         160G  20.7T  13.7K      0  1.71G      0
test         160G  20.7T  13.9K      0  1.74G      0
test         160G  20.7T  14.2K      0  1.78G      0
test         160G  20.7T  13.6K      0  1.70G      0
test         160G  20.7T  13.8K      0  1.72G      0
test         160G  20.7T  13.0K      0  1.63G      0
test         160G  20.7T  14.4K      0  1.79G      0
test         160G  20.7T  14.2K      0  1.77G      0
test         160G  20.7T  14.3K      0  1.78G      0
test         160G  20.7T  12.5K      0  1.56G      0
test         160G  20.7T  13.7K      0  1.71G      0
test         160G  20.7T  13.9K      0  1.74G      0
test         160G  20.7T  13.7K      0  1.71G      0
test         160G  20.7T  13.4K      0  1.68G      0
test         160G  20.7T  13.5K      0  1.69G      0
test         160G  20.7T  14.3K      0  1.78G      0
test         160G  20.7T  14.1K      0  1.76G      0
test         160G  20.7T  14.2K      0  1.78G      0
test         160G  20.7T  13.8K      0  1.73G      0
test         160G  20.7T  13.8K      0  1.72G      0
test         160G  20.7T  13.8K      0  1.72G      0
test         160G  20.7T  13.3K      0  1.66G      0
test         160G  20.7T  14.1K      0  1.76G      0
test         160G  20.7T  13.6K      0  1.70G      0
test         160G  20.7T  13.8K      0  1.73G      0
test         160G  20.7T  13.8K      0  1.72G      0
test         160G  20.7T  13.9K      0  1.74G      0
test         160G  20.7T  14.2K      0  1.77G      0
test         160G  20.7T  14.1K      0  1.76G      0
test         160G  20.7T  14.1K      0  1.77G      0
test         160G  20.7T  14.1K      0  1.76G      0
test         160G  20.7T  14.5K      0  1.81G      0
test         160G  20.7T  13.5K      0  1.69G      0
test         160G  20.7T  14.3K      0  1.79G      0
test         160G  20.7T  14.1K      0  1.76G      0
test         160G  20.7T  14.2K      0  1.77G      0
test         160G  20.7T  14.4K      0  1.79G      0
test         160G  20.7T  14.4K      0  1.80G      0
test         160G  20.7T  14.0K      0  1.75G      0
test         160G  20.7T  14.4K      0  1.80G      0
test         160G  20.7T    620      0  77.5M      0