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1、ndAppearsinProceedingsofthe2USENIXWindowsNTSymposium,Seattle,WA,August3-5,1998.APerformanceStudyofSequentialI/OonWindowsNT™4ErikRiedelCarnegieMellonUniversity,riedel@cmu.eduCatharinevanIngen,JimGrayMicrosoftResearch,{vanIngen,Gray}@microsoft.comAbstractquentialIOisalsoanimportantfactorin
2、thestartupofinteractiveapplications.MinimizingIOoverheadandLarge-scaledatabase,datamining,andmultimediamaximizingbandwidthfreespowertoactuallyprocessapplicationsrequirelarge,sequentialtransfersandthedata.havebandwidthasakeyrequirement.Thispaperin-vestigatestheperformanceofreadingandwriti
3、nglargeFigure1showshowdataflowsinamodernstoragesequentialfilesusingtheWindowsNT™4.0FileSys-subsystem.Applicationrequestsarepassedtothefiletem.ThestudyexplorestheperformanceofIntelsystem.IfthefilesystemcannotservicetherequestPentiumPro™basedmemoryandIOsubsystems,in-fromitsmainmemorybuffer
4、s,itpassesrequeststoacludingtheprocessorbus,thePCIbus,theSCSIbus,hostbusadapter(HBA)overaPCIperipheralbus.Thethediskcontrollers,andthediskmediainatypicalHBApassesrequestsacrosstheSCSIbustothediskserverorhigh-enddesktopsystem.Weprovidedetailsdrivecontroller.Thecontrollerreadsorwritesthedi
5、skoftheoverheadcostsateachlevelofthesystemandmediaandreturnsdataviathereverseroute.examineavarietyoftheavailabletuningknobs.WeThelarge,boldnumbersinFigure1indicatethead-showthatNTFSout-of-the-boxperformanceisquitevertisedthroughputslistedontheboxesofthevariousgood,butoverheadsforsmallreq
6、uestscanbequitehardwarecomponents.Thesearethefiguresquotedinhigh.Thebestperformanceisachievedbyusinglargehardwarereviewsandspecifications.Severalfactorsrequests,bypassingthefilesystemcache,spreadingthepreventyoufromachievingthisPAP(peakadvertiseddataacrossmanydisksandcontrollers,andusing
7、performance).Themedia-transferspeedandtheproc-deep-asynchronousrequests.Thiscombinationallowsessingpoweroftheon-drivecontrollerlimitdiskustoreachorexceedthehalf-powerpointofallthebandwidth.Thewire’stransferrate,thedisktransferindividualhardwarecomponents.rate,andSCSIproto
