6/30/2010
Data Test Program (dt)
27
Disk Specific Features
nRandom & Sequential I/O (iotype=sequential or random)
nSupports raw & block devices (gleaned from stat() or IOCTL)
nMultiple procs creates multiple 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 file. (aka sparse)
nControl FS output file disposition (dispose=delete or keep or keeponerror). Note: Has no affect on existing files! (always keeps)