HighAvailability LicensingWord文件下载.docx
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HighAvailability LicensingWord文件下载.docx
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svendor.
High-availabilitylicensingisrecommendedonlyforuserswhoarealreadyexperiencedwithmanagingindividuallicenseserversandwhoalreadyhaveastablelicensingenvironmentworking.
Forplanninginformation,seePlanningClustersforHigh-AvailabilityLicensing.Foranexample,seeCreatingaCluster.
Note:
OnlynormalnetworkconcurrentlicensescanexploitHAL.
PlanningClustersforHigh-AvailabilityLicensing
Forhigh-availabilitylicensing,yousetupclustersofnetworklicenseserversconnectedthroughTCP/IP.Forconcurrentlicenseswithvendor-managedusecontrolonly,thesoftwarevendorgeneratespasswordsthatareboundtotheclusterratherthantoasingleserver.Someoftheserversinaclusterservelicenses,whileotherswaitinreservetotakeoverincaseaservingservergoesdown.Theserversthatareservingatanytimeshareequallytheresponsibilityforthelicensesthatareboundtothecluster,andkeeponeanotherinformedaboutthestatusofthelicenses.
Differentlicenseservers(bothintermsofLicenseUseManagementversionsandoperatingsystems)cancoexistinthesamecluster,providedtheyareeitheratLicenseUseManagement4.5.5to4.6.2,orLicenseUseManagement4.6.4orhigher.
Anetworklicenseserverthatisamemberofaclustercanservelicensesthatareboundtotheserver,andparticipateasamemberofaclusteratthesametime.
RestrictionsonClusterSizeandComposition
Forsecurityreasons,itisnecessarytoimposestrictrulesonthesizeandcompositionofclusters.
Attention:
Beverycarefulwhenyoudecidehowmanyandwhichserverstoputinacluster.Youwillnotbeabletochangeyourdecisionsafterthefactandtheywillaffectthesizeandcompositionoftheclusteraslongasitexists.
Whenyoucreateacluster,youspecifytheinitialnumberofserversinthecluster,andwhichserverstheyare.Theinitialnumbermustbeintherange3through10.Thefirstserverassignedtotheclusterisautomaticallyactivated;
thatis,itisavailabletoparticipateinservinglicensesaspartofthecluster.Youmustexplicitlyactivatetheothermembers.
Theinitialnumberofserversdictatestwoimportantattributesofthecluster:
∙Theminimumnumberofserversthatmustbeactivatedintheclusterfortheclustertowork
∙Themaximumnumberofserversthatcanbeaddedtotheclusterinadditiontotheinitialnumber
Ifyouwanttoreplaceaserverworkstationthatisoneoftheinitialminimumnumber,toupgradethehardwareortoreplacefailinghardware,addanewservertothecluster.Thenumberofnewserversyoucanadd,eventoreplaceotherservers,islimited.
Theinitialminimumnumberofserversmustalwaysbeinthecluster;
theymustnotbedeactivated.Ifanyisdeactivated,theclusterceasestoservelicenses.
Passwordsthatareboundtoaclusterareusableononlythatcluster.Ifyoufinditnecessarytodeleteaclusterandcreateanewone,ortocreateadditionalclusters,youwillnotbeabletouseexistingpasswordsonthenewcluster.
Todeleteacluster,deactivateallitsmembers.Whenyoudeactivateaserver,itmustbeupandrunning.
Afteraclusterhasbeencreatedanditsmembershavebeenactivated,thenumberofactivatedmembersdetermineshowmanyserversmustbeupandrunningfortheclustertofunction.
TherelationshipsbetweentheseclusterattributesisshowninTable6.
Theminimumnumberofserversupandrunning,asshowninthetable,isthenumberofserversthatservelicenses.Allserversbeyondthatnumberareinreserve,waitingtotakeoverifaservingservergoesdown.
Table6.NumberofServersinaCluster
InitialNumber
MinimumActivatedforClustertoWork
MaximumAddedafterClusterCreation
ActualActivated
MinimumUpandRunningforClustertoWork
3
2
1
2
3
4
4
5
6
5
6
7
8
7
8
9
10
9
10
11
12
ExamplesofClusterSizeRules
Example1
Initialnumberofserversis3
Thefollowingrulesapply:
∙Duringthelifeofthecluster,youcanaddonlyoneservertothecluster,butthefirsttwoserversdeclaredintheclustercannotbereplaced(duetosecurityexposure).Thismeansyoucanaddanewserverwithupgradedhardware,anddeactivatetheoriginalthirddeclaredserver,onlyonceduringthelifeofthecluster.Thisscenariohastheeffectofreplacingaserverwithanupgradedworkstation.Alternatively,youcanaddafourthservertotheclusterwithoutdeactivatinganyoftheoriginalthree,thusincreasingtheclustersizetofourservers.Again,youcanaddaserveronlyonce.
∙Morethanhalfoftheactivatedserversmustbeupandrunningfortheclustertowork.
Table7showshowtheserversaredeployed,dependingonhowmanyareactivated,andhowmanyareupandrunning.
Table7.Example-ClusterwithThreeInitialMembers
NumberofActivatedMembers
NumberofMembersUpandRunning
NumberofMembersServingLicenses
NumberofServersInReserve
0*
1
*Whenthenumberofserversinreserveis0,thereisnohigh-availabilityadvantage
Example2
Initialnumberofserversis6
∙Duringthelifeofthecluster,youcanaddtwoserverstothecluster,butthefirstsixserversdeclaredintheclustercannotbereplaced(duetosecurityexposure).
∙Whethertheclusterhassix,seven,oreightmembers,atleastsixmembersmustbeactivatedfortheclustertowork.
Table8showshowtheserversaredeployed,dependingonhowmanyareactivated,andhowmanyareupandrunning.
Table8.Example-ClusterwithSixInitialMembers
ClusterMembershipConsiderations
Ifyouusedirectbinding,andyouwanttotakefulladvantageofthehighavailabilityoflicenses,makesurethefollowinghavetheclusterserversintheirdirectserverbindinglists:
1.Thenetworkclientsthatwilluselicensesboundtothecluster
2.Alltheserversofthecluster
Ifyouusenamespacebinding,alltheserversinaclusterandalltheirnetworkclientsmustbeinthesamecellinordertoexploitfullythehighavailabilityoflicenses.
IfyouuseHALwithremoteadministrationdisabled,therearesomeimportantpointstotakeintoconsideration:
∙Allclustermembersmustadheretothesameremoteadministrationpolicy(thatis,eitheralldisabled,orallenabled).
∙Fromaremoteadministrationpointofview,theclusterbehavesasasingleserver.
∙Ifremoteadministrationisdisabled,itisnotpossibletoenrollordeletelicensesfromamachinethatisnotaclustermember.
∙Aclustercanbecreatedonlyiftherequestcomesfromthelocalnode.Clustermemberscanbedeactivatedonlyfromanotherclustermember.
Aservercanbeactivatedinonlyoneclusteratanytime.Ifyouassignaservertoaclusterandneveractivateit,orexplicitlydeactivateit,itcanjoinasecondclusterandbeactivatedthere.Butinthiscase,theservercannotbeactivatedinitsoriginalcluster,andnootherservercanbesubstitutedintheoriginalcluster.Toreactivatetheserverinitsoriginalcluster,youmustfirstdeactivateitinthesecondcluster.
Notes:
1.Eitherdisableorenableremoteadministrationonallservers.Ifyouenableordisableitonlyonsomeservers,y
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