nFor file system I/O, there are two preferred command
lines to consider:
u# dt of=dt.data min=1 max=256k incr=var limit=100m
enable=lbdata procs=10
u OR
u# dt of=dt.data min=b max=256k incr=var limit=100m
pattern=iot procs=10
uAlternate between buffered I/O and direct I/O (flags=direct).
nFor raw I/O disk tests:
u# dt of=/dev/hdisk7 min=b max=256k incr=var pattern=iot
slices=10 aios=4 align=rotate
nFor performance disk tests:
u# dt of=dt.data bs=64k limit=1g disable=compare
u OR
u# dt of=/dev/hdisk7 bs=64k aios=32 disable=compare
nIt’s advisable to alternate between sequential and
random I/O, and when doing
sequential, alternate between forward and reverse direction.