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1、“acceptedforthe27thEUROMICROConference,WorkshoponMultimediaandTelecommunication;Warsaw,September4-6,2001”ReplicationwithQoSsupportforaDistributedMultimediaSystemGiwonOn1,JensSchmitt1,MichaelLiepert1,andRalfSteinmetz1,21:DarmstadtUniversityofTechnology2:FhG-IPSIMerckstr.25•64283Darmst
2、adt•GermanyDolivostr.15•64293Darmstadt•GermanyEmail:{Giwon.On,Jens.Schmitt,Michael.Liepert,Ralf.Steinmetz}@KOM.tu-darmstadt.deAbstracticetime.Furthermore,becauseoftheavailablereplicainthelocalmedianode,theassurancethatuserscancontinuetheirReplicatingdataandservicesatmultiplenetworked
3、com-presentationinasituationofnetworkdisconnection,issig-putersincreasestheserviceavailability,fault-tolerancenificantlyhigherthanwithoutreplica.andqualityofservice(QoS)ofdistributedmultimediasys-Inthispaper,wediscusssomerelevantdesignandimple-tems.Inthispaper,wediscusssomerelevantdes
4、ignandim-mentationissuesofareplicationmechanismforadistribut-plementationissuesofareplicationmechanismforaedmultimediasystemmedianode[1]whichiscurrentlydistributedmultimediasystemmedianode[1]whichisadevelopedasaninfrastructuretosharemultimedia-en-softwareinfrastructuretosharemultimed
5、ia-enhancedhancedteachingmaterialsamonglecturegroups.Withtheteachingmaterialsamonglecturegroups.Toidentifynewreplicationmechanism,medianodeprovidesenhancedac-replicationrequirements,wefirststudythecharacteristicscesstopresentationmaterialsinbothconnectedanddiscon-ofpresentationalmedi
6、atypeswhicharehandledinmedian-nectedoperationmodes.ode,thenextractnewreplicaunitsandgranularitieswhichThestructureofthepaperisasfollows.InSection2,wehavenotbeenconsideredandnotsupportedinexistingrep-identifynewreplicationrequirements.Afteranalyzingthelicationmechanisms.Basedonthenewr
7、equirementsandcharacteristicsofpresentationalmediatypes,weclassifytheresultoffeaturesurveys,weimplementedareplicationthreedifferenttypesoftargetreplicasaccordingtotheirmechanismformedianode.Thenextworkingstepistoeval-granularity(datasize),requirementofQoSsupport,updateuatetheefficien
8、cyofourrepli
