NCQ disabled, 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    224      0  27.8M      0
test        80.0G  20.8T     65      0  8.04M      0
test        80.0G  20.8T      0      0      0      0
test        80.0G  20.8T  7.31K      0   933M      0
test        80.0G  20.8T  12.2K      0  1.53G      0
test        80.0G  20.8T  13.4K      0  1.67G      0
test        80.0G  20.8T  13.2K      0  1.65G      0
test        80.0G  20.8T  12.3K      0  1.54G      0
test        80.0G  20.8T  13.4K      0  1.68G      0
test        80.0G  20.8T  12.6K      0  1.57G      0
test        80.0G  20.8T  12.2K      0  1.52G      0
test        80.0G  20.8T  13.2K      0  1.65G      0
test        80.0G  20.8T  13.6K      0  1.70G      0
test        80.0G  20.8T  13.5K      0  1.69G      0
test        80.0G  20.8T  13.2K      0  1.65G      0
test        80.0G  20.8T  13.4K      0  1.68G      0
test        80.0G  20.8T  13.0K      0  1.63G      0
test        80.0G  20.8T  12.7K      0  1.59G      0
test        80.0G  20.8T  12.8K      0  1.60G      0
test        80.0G  20.8T  13.4K      0  1.68G      0
test        80.0G  20.8T  13.6K      0  1.70G      0
test        80.0G  20.8T  13.0K      0  1.62G      0
test        80.0G  20.8T  13.4K      0  1.67G      0
test        80.0G  20.8T  12.8K      0  1.60G      0
test        80.0G  20.8T  12.4K      0  1.55G      0
test        80.0G  20.8T  13.7K      0  1.71G      0
test        80.0G  20.8T  13.2K      0  1.65G      0
test        80.0G  20.8T  13.1K      0  1.64G      0
test        80.0G  20.8T  12.9K      0  1.61G      0
test        80.0G  20.8T  13.4K      0  1.68G      0
test        80.0G  20.8T  13.2K      0  1.65G      0
test        80.0G  20.8T  13.0K      0  1.62G      0
test        80.0G  20.8T  13.4K      0  1.67G      0
test        80.0G  20.8T  12.5K      0  1.56G      0
test        80.0G  20.8T  13.2K      0  1.65G      0
test        80.0G  20.8T  12.5K      0  1.57G      0
test        80.0G  20.8T  13.8K      0  1.73G      0
test        80.0G  20.8T  13.1K      0  1.63G      0
test        80.0G  20.8T  12.7K      0  1.59G      0
test        80.0G  20.8T  13.5K      0  1.68G      0
test        80.0G  20.8T  13.5K      0  1.69G      0
test        80.0G  20.8T  13.3K      0  1.66G      0
test        80.0G  20.8T  13.6K      0  1.70G      0
test        80.0G  20.8T  13.7K      0  1.71G      0
test        80.0G  20.8T  13.6K      0  1.70G      0
test        80.0G  20.8T  13.0K      0  1.63G      0
test        80.0G  20.8T  13.2K      0  1.64G      0
test        80.0G  20.8T  13.5K      0  1.68G      0
test        80.0G  20.8T  13.2K      0  1.65G      0
test        80.0G  20.8T  13.3K      0  1.67G      0
test        80.0G  20.8T  13.4K      0  1.67G      0
test        80.0G  20.8T  13.0K      0  1.62G      0
test        80.0G  20.8T  12.3K      0  1.54G      0
test        80.0G  20.8T  13.0K      0  1.63G      0
test        80.0G  20.8T  13.5K      0  1.69G      0
test        80.0G  20.8T  12.6K      0  1.58G      0
test        80.0G  20.8T  13.3K      0  1.67G      0
test        80.0G  20.8T  13.5K      0  1.69G      0
test        80.0G  20.8T  13.8K      0  1.73G      0
test        80.0G  20.8T  13.6K      0  1.70G      0
test        80.0G  20.8T  13.2K      0  1.64G      0
test        80.0G  20.8T  12.5K      0  1.56G      0
test        80.0G  20.8T  13.3K      0  1.66G      0
test        80.0G  20.8T  11.6K      0  1.45G      0
test        80.0G  20.8T  11.1K      0  1.39G      0
test        80.0G  20.8T  13.6K      0  1.69G      0
test        80.0G  20.8T  13.8K      0  1.73G      0
test        80.0G  20.8T  13.1K      0  1.64G      0
test        80.0G  20.8T  13.6K      0  1.70G      0
test        80.0G  20.8T  13.2K      0  1.66G      0
test        80.0G  20.8T  13.0K      0  1.63G      0
test        80.0G  20.8T  13.8K      0  1.73G      0
test        80.0G  20.8T  12.8K      0  1.60G      0
test        80.0G  20.8T  13.5K      0  1.69G      0
test        80.0G  20.8T  13.8K      0  1.73G      0
test        80.0G  20.8T  13.1K      0  1.64G      0
test        80.0G  20.8T  13.8K      0  1.73G      0
test        80.0G  20.8T  13.8K      0  1.72G      0
test        80.0G  20.8T  13.1K      0  1.64G      0
test        80.0G  20.8T  13.2K      0  1.65G      0
test        80.0G  20.8T  13.3K      0  1.67G      0
test        80.0G  20.8T  13.7K      0  1.72G      0
test        80.0G  20.8T  13.3K      0  1.66G      0
test        80.0G  20.8T  13.8K      0  1.72G      0
test        80.0G  20.8T  13.8K      0  1.72G      0
test        80.0G  20.8T  13.4K      0  1.68G      0
test        80.0G  20.8T  13.0K      0  1.63G      0
test        80.0G  20.8T  13.0K      0  1.62G      0
test        80.0G  20.8T  13.2K      0  1.65G      0
test        80.0G  20.8T  13.1K      0  1.64G      0
test        80.0G  20.8T  13.3K      0  1.66G      0
test        80.0G  20.8T  13.6K      0  1.70G      0
test        80.0G  20.8T  13.4K      0  1.67G      0
test        80.0G  20.8T  13.1K      0  1.64G      0
test        80.0G  20.8T  13.7K      0  1.71G      0
test        80.0G  20.8T  13.1K      0  1.64G      0
test        80.0G  20.8T  13.1K      0  1.63G      0
test        80.0G  20.8T  13.1K      0  1.64G      0
test        80.0G  20.8T  13.3K      0  1.66G      0
test        80.0G  20.8T  13.4K      0  1.67G      0
test        80.0G  20.8T  12.8K      0  1.60G      0
test        80.0G  20.8T  13.4K      0  1.67G      0
test        80.0G  20.8T  13.7K      0  1.71G      0
test        80.0G  20.8T  13.4K      0  1.68G      0
test        80.0G  20.8T  13.5K      0  1.69G      0
test        80.0G  20.8T  13.5K      0  1.69G      0
test        80.0G  20.8T  13.3K      0  1.66G      0
test        80.0G  20.8T  13.1K      0  1.64G      0
test        80.0G  20.8T  12.5K      0  1.56G      0
test        80.0G  20.8T  13.2K      0  1.66G      0
test        80.0G  20.8T  13.4K      0  1.68G      0
test        80.0G  20.8T  13.0K      0  1.62G      0
test        80.0G  20.8T  12.6K      0  1.57G      0
test        80.0G  20.8T  12.3K      0  1.54G      0
test        80.0G  20.8T  12.8K      0  1.59G      0
test        80.0G  20.8T  13.4K      0  1.68G      0
test        80.0G  20.8T  13.4K      0  1.68G      0
test        80.0G  20.8T  13.8K      0  1.73G      0
test        80.0G  20.8T  14.0K      0  1.75G      0
test        80.0G  20.8T  13.6K      0  1.70G      0
test        80.0G  20.8T  12.8K      0  1.60G      0
test        80.0G  20.8T  9.58K      0  1.20G      0
test        80.0G  20.8T  4.01K      0   514M      0