nFor file system I/O
tests:
u# dt of=/var/tmp/dt.data min=b max=256k incr=var
oflags=trunc limit=1g \
u pattern=iot
iotype=random procs=10
u OR
u# dt of=/var/tmp/dt.data min=1 max=256k incr=var
oflags=trunc limit=1g \
u enable=lbdata
files=10 sdirs=3 depth=10 procs=2
uAlternate between buffered I/O and direct I/O via
flags=direct
nFor raw I/O disk
tests:
u# dt of=/dev/rhdisk7 min=b max=256k incr=var
pattern=iot slices=10 aios=4
nFor performance disk
tests:
u# dt of=/var/tmp/dt.data bs=64k limit=1g
disable=compare,fsync
u OR
u# dt of=/dev/rhdisk7 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
directions.