学习NBU文档04

VeritasStorageFoundationandHighAvailability6.0forUNIXDifferences:CoreProductsStorageFoundation6.0ChangesLessonintroduction•VeritasSFHA6.0Differences:IntroductionandDeployment–Lesson1:SFHA6.0DifferencesOverview–Lesson2:InstallingandUpgradingtoSFHA6.0•VeritasSFHA6.0Differences:CoreProducts–Lesson3:SF6.0NewFeatures–Lesson4:SF6.0Changes–Lesson5:ChangesinSFHA6.0ClusterCommunicationsandFencing–Lesson6:ChangesinVCS6.0EngineandAgents•VeritasSFHA6.0Differences:OtherClusteringandDisasterRecoveryProducts–Lesson7:ChangesinSFCFS,Replication,andGlobalClustering–Lesson8:ChangesinDatabaseSupportwithSFHA6.0•VeritasSFHA6.0Differences:VirtualizationSupport–Lesson9:VirtualizationSupportinSFHA6.0•VeritasSFHA6.0Differences:SupportforVirtualBusinessServices–Lesson10:VirtualBusinessServiceswithVCS6.0andVOM4.1TopicObjectivesChangesinstoragecheckpointsUnderstandchangeswithremovablecheckpoints,setremovablecheckpointsasthedefaulttype,andusethenewcheckpointvisibilityfeature.ChangesinfilesystemdefragmentationDescribethenewfragmentationreportingimprovementsandusefreespacedefragmentation.DMPenhancementsUnderstandrootvolumegroupsupportonAIXanddescribeotherperformanceandusabilityenhancementswithDMP.OtherusabilityenhancementsDescribeandbenefitfromusabilityenhancements,suchasthinprovisioningchanges,human-friendlyinputandoutput,creatingmaximumsizevolumes,resuminglongrunningtasks,andsoon.SupportabilityenhancementsinSF6.0DescribethechangesinSF6.0thatprovideperformanceimprovementsandmakeiteasiertosupporttheproduct.LessonobjectivesAftercompletingthistopic,youwillbeabletounderstandchangeswithremovablecheckpoints,setremovablecheckpointsasthedefaulttype,andusethenewcheckpointvisibilityfeature.ChangesinstoragecheckpointsRemovablecheckpointsandENOSPCcondition•UnderENOSPCcondition,checkpointremovalistriggeredonlyforlimitedsetoffileoperations:Remove,rmdir,filetruncation•Removablecheckpointsareremovedeveniftheyaremountedexplicitlybyadministrators.WithSF6.0PreSF6.0•UnderENOSPCcondition,checkpointremovalistriggeredforanextendedsetoffileoperations:Remove,rmdir,filetruncation,create,mkdir,rename,symlink,hardlink,filewrite•Removalisnottriggeredforadministrativeoperations.fsadm,fcladm,qiomkfile,fsckptadmChangesindefaultcheckpointtype•Newtunableparametertomakeremovablecheckpointsthedefaultoption:vxtunefs-Dckpt_removable=1•Thepolicyisstoredin/etc/vx/vxfssystem.•Thefsckptadmcommandchecksthefile:•Ifthevariableckpt_removable=1isset,thenremovablecheckpointsarecreated.•Ifthevariableisnotsetorfiledoesnotexistitcreatesnon-removablecheckpoint.•Overrideofdefaultoptionisalsosupported:fsckptadm–Rcreateckpt_namemountpoint•Thevxtunefs–Dprintcommanddisplaysthedefaultoptiontuned.•InanSFCFSclusterenvironment:cfsmntadmvxtunefs–Dckpt_removable=1NewwithSF6.0•Newmountoption“-ockptautomnt=ro|rw|off”toenableautomaticmountingofallstoragecheckpointsofafilesystem•Checkpointsmountedto/mountpoint/.checkpoint/ckpt_name•Thefeaturecanbeenabledordisabledbyremountingthefilesystem.CheckpointvisibilityinVxFS6.0Benefits•Allowsimmediateaccesstoallcheckpointswithoutadditionaladministratoraction.•OverNFS,allowsaccesstothefilesystemandallofitscheckpointswithoutrequiringadditionalNFSexports.Requirements•Supportedlocallyonallplatforms(Linux,Solaris,AIX,HP-UX).•SupportedoverNFSonLinux,Solaris,andAIX.•Fromaterminalwindow,createadatadgdiskgroupwith4disks.Createa2Gdatavol1volumeinthediskgroup.•CreateaVxFSfilesystemonthedatavol1volume.•Mountthenewfilesystemto/data1usingthenewckptutomntoption.•Copysomefilesintothe/data1directory.•Createacheckpointonthefilesystem.•Verifythatthecheckpointisaccessibleinthe.checkpointdirectory.•Modifyafiletoseethechangessincethecheckpointwascreated.•Createanothercheckpointandverifythatbothcheckpointsareaccessible..•Comparethechangedfileinthetwoclonestoshowthatthenewclonealsohasthechangeddataandthefirstclonestillhastheoriginaldata.•Turnoffthefeaturebyremountingthefilesystem.Demonstration:VxFScheckpointvisibilityAftercompletingthistopic,youwillbeabletodescribethenewfragmentationreportingimprovementsandusefreespacedefragmentation.Changesinfilesystemdefragmentation•Reporting–Fileandfreespacefragmentationreportsdonotprovideaclearpictureoftheoverallsituation.fsadm–E/home…%Freeblocksinextentssmallerthan64blks:8.35%Freeblocksinextentssmallerthan8blks:4.16%blksallocatedtoextents64blksorlarger:45.81…–Nospecificrecommendationisprovidedtoadministrator.–Incaseofhighlyfragmentedlargefilesystems,ittakesalongtimetogeneratethereport.•Filesystemdefragmentationcantakealongtimesometimeswithminimalimprovements.•Freespacedefragmentationalgorithmisnotalwaysefficientindefragmentingthefreespace.Limitationsofdefragmentationbefore6.0•Extentfragmentationreporting(fsadm–Emountpoint)includes:–AsimpletointerpretfragmentationindexforfileandfreespacefragmentationTheindexisavaluebetween0and100(0meansnofragmentation)–Numberoffilesineachbucketoffragmentationindex–Asummaryreport•Incrementaldefragmentationispossiblewiththe–Ttimeoption.•Timetakentogeneratethedefragmentationreportissignificantlyreduced.•Freespacedefrag