nRandom & Sequential I/O (iotype=sequential or
random).
nSupports raw & block devices (gleamed from stat() or
IOCTL).
nAllows multiple file system files (unique files using
child PID).
nSupports copy/verify of disks (iomode=copy, test, or
verify).
ucopy/verify is for image mode copy operations.
nSupports reverse direction (iodir=forward or
reverse).
ureverse I/O is a variant of random I/O.
nSupports multiple disk slices (slices= options).
ushared LUN testing via slices=hosts slice=host#
nSupports skipping blocks (step=value option).
ucreates holes (empty space) in FS files.
nControl FS output file disposition (dispose=delete or
keep).