面向多網(wǎng)卡的自適應(yīng)負(fù)載均衡中間件研究.pdf

1、東南大學(xué)碩士學(xué)位論文面向多網(wǎng)卡的自適應(yīng)負(fù)載均衡中間件研究姓名：杜英芳申請學(xué)位級別：碩士專業(yè)：計算機(jī)應(yīng)用技術(shù)指導(dǎo)教師：汪蕓20080107東南大學(xué)碩士學(xué)位論文ABSTRACTwiththedevelopmentofcomputernetworkmorerequirementsofbettersystemaccessibilityandreliabilityappearManylargewebserviceprovidersadoptLVS

2、(LinuxVirtualServers)toimprovetheirserviceperformanceButtheproblemofsingle—nodefailureoftaskdistributorsandworkingnodesstillexistsForsomespecialapplicationsystems，stocksystems，forinstance，singlenodefailureisnotacceptable

3、，whichmayleadtohugelossesmproblemtoprovidehiglsystemaccessibilityandreliabilityisputonthetoplistInordertoachievethegoal，asinger$erverisusuallyequippedwithmultiplenetworkinterfacecards(NIC)Accordingtothemodestousemultiple

4、NICstwotypesareclassified，namelyLinkTrunkingandRedundantLANsLinkTrunkingsetsupmultipleph)rsicallinksbetweentheserversandthefacilitiestoimprovetheaccessibilityandcommunicationrateItbindsthesephysicallinksintoasinglevirtua

5、llinktotheupperlayerNosinglelinkfailurewillimpacttheserveraccessibilityTosetupvirtuallinks，administratorsmustusespecialchips，andinstalladditionaldriversandmanagementsoftwareLinkTrunkingisplatformandhardwaredependant111el

6、oadbalancingalgorithmsusedbyLinkTrunkingareusuallyasymmetricRedundantLANsusedualormultiplenetworkredundancyInredundantLANs，onlyonesubnetisonworking(iemastersubnet)，theotherone(ieslavesubnet)isleftunusedAssoonasthemasters

7、ubnetfails，theslavesubnettakesoverandkeepsthesystemrunningSpecialhotbackupsoftware，servers，switchers，andsmartNICsarerequiredinRedundantLANsEveryredundantdesignisapplicationorientedMoreoveritiscomplextoconfigureRedundantL

8、ANsandtheresourceutilizationislowThisthesisadoptsmiddlewaretechniquetomaskmultipleNlCsfortheapplicationsandmanagesalltheredundantlinksbetweenworkingnodes111egoalsaretwofoldedOntheonehand，faulttolerancepropertyismaintaine

9、dbymultipleNICs，systemconfigurationissimplifiedandthedependenceonbothplatformsandhardwareisweakenedOntheotherhandsystemperformanceisimprovedbyloadbalancingschedulingThemiddlewareprovidesasetofinterfacestosupportdatatrans

10、ferringneapplicationssendtheirdatatothesystembyinvokingtheseinterfacesandthesystemtransfersthesepacketstothedestinationsBythiswaythesystemcanbalancetheworkingloadamongmultipleNICsandimprovethetransmissionperformanceThema

11、incontributionsareasfollowing：1)ItpresentsanddesignsaMultipleNICsbasedLoadBalancingMiddleware(MLBM)tosupportmultipleNICsItsimplifiessystemconfigurations，andprovidesuniforminterfacestoupperlayersItweakensthedependenceonha

12、rdwareandnetworktopologyItiseasytobetransplanted2)ItinvestigatesmultiplealgorithmsofloadbalancingalgorithmsincludingroundbinhotbackuploadbalanceonvaluesandloladbalanceonclustersItfurtheranalyzestheperformanceofthesealgor

13、ithmsundervarioussituationsSomeofthealgorithmssupportbidirectionalloadbalanceItdesignsasymmetricanddynamicloadbalncingalgorithminclusterenvironmentLBOCBydynamicallyadjustingthelogicalcontroltopologyoftheclusterthealgorit

14、hmisabletoimprovesystemperformanceandprotecttheschedulingnodefrombeingthebottleneckofasystem31ItimplementstheprototypeofmultiNICsbasedloadbalancingmiddlewareThetestsandperformanceanalysisarepresentedindetailKEYWORDS：Load