??2????÷????????????????IO????????????????????linux???μ?dd????????????????????????????????С?????????????????????????? ??

??1??dd???????? Linux??UNIX ??????????????????????????????С?????п??????????????????????????????????dd???????????д???? ??

??dd if= dev zero of=test bs=64k count=4k oflag=dsync ??

??dd if=dev zero of=test bs=8k count=256k conv=fdatasync ????

??????DD??????????IO???????????????????????λ??????? ??

??2????????IO?????????????Orion??HD Tune??PR??; ????

?????????????????????洢??????????????????????????????????ζ?????????????????????????????洢???????????????????У??????????????????ú?????????洢??????????????????????????????????????????????????????????????? ????Orion???????IO??????????????????IOPS?????????????????????dd???????????IOPS??????????????IOPS?????????????????????????????Orion????IO???????????????????????????????IO?????????????????????????????????IO?????????????????????IO???????????????????????????????20??????IO???????? ??

??Orion??????IOPS?????????????????????????7200?SATA??IOPS?100????????洢???15000???????IOPS???200?? ???????Orion????????????????????????????????????????????????? ???????????????????????÷?????????? ??