面向多網卡的自適應負載均衡中間件研究.pdf

1、東南大學碩士學位論文面向多網卡的自適應負載均衡中間件研究姓名：杜英芳申請學位級別：碩士專業(yè)：計算機應用技術指導教師：汪蕓20080107東南大學碩士學位論文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