??????????????????????

???????????????????????????????????????в????
????????????????
????fio?? ?????????μ?data???????????????д????open(??DIRECT_IO)????????????????????????
????iozone?????????д?????????????????????棬??????????????λ??棬???????????fio?????
????dd?????????????????
???????????dd if=filepath of=/dev/null bs=2M count=512
????????д??dd if=/dev/zero of=filepath bs=2M count=512
?????????????????????????????
????1. iozone???-I????(??????????)??????Ч?????????1/10??д??????????????
????2. fread??fwrite??????????????С????????????????????????У?fread??Ч?????????????
????3. dd????????????????????????????в?????????????ε?????(?2???????????????????????е??????????????浽??????У??????????????????????????????????????????飬??????????????????д???????????????????????????????????????У??????????????????)
????4. ????????
????SAS???250MB/s?????
????SSD???870MB/s?????
????RAID????SAS??RAID????????????????????10?????1.6GB/s??
????MFS????chunkserver??SAS??SSD????????????????????100MB/s;
??????????????????
????1??iperf?????????????????????????????????y??????????????????????????
????2??ethtool -eth0??????????????????????????
????3??wget??curl?????????????????nginx???????????????????????????????/dev/null??????????????????????
????4??????????(????????????????????)
???????????????????117MB/s
????????????????????12MB/s