Google Search Appliance Upgrade and Migration Handbook Bedienungsanleitung PDF herunterladen (Seite 18)

SinglenodetoMultinode

WhenanarchitecturechangesfromasingleGSAtomultipleGSAs(eg.over100Mdocuments,requiring

twoG500appliancesinsteadofone),DistributedCrawlandServewillneedtobeconfigured.Asaresult,the

searchindexwilleitherneedtobereindexedonthenewarchitecture,ormigrated.Inthisscenario,when

DistributedCrawlandServeisenabled,theMasterGSAnodewilldistributetheindexevenlyacrossthe

GSAsconfiguredinthemultinodeGSAnetwork.

Multinodetomultinode

WhenanexistingDistributedCrawlandServearchitectureismodified(eg.usingGB9009sandmovingfrom

60Mto90Mdocuments,requiringthreeGB9009appliancesinsteadoftwo),thenewGSAcanbeaddedas

anewshard/nodetothearchitecture,andtheentiresearchindexwillberedistributedevenlyacrossall

GSAs.Forexample,if54MdocumentshavebeenindexedacrosstwoGSAs,andathird30MGSAis

addedtothenetworkasanewshard,theindexwillberedistributedandeachGSAwillhave18Mdocs.

MigratingwithexistingmirroredGSAs

ThefollowingscenariosdescribedetailedapproachestomigratingtonewsearchapplianceswhereGSA

Mirroringisalreadyinuseonexistingappliances.

ScenarioA:Newappliancesareofthesamemodelandsoftwareversion

Inascenariowherenewappliancesareofthesamemodelandsoftwareversion,mirroringcanusedto

migratetheindexandconfigurationstoanewappliance,whichisthenusedasthemasterapplianceofa

newGSAmirroringnetwork.Thisscenariothesameasthatisdescribedintheabovesection,Migrating

searchindexandconfigurations.

ScenarioB:NewappliancesareNOTofthesamemodelandsoftwareversion.

Inascenariowherenewappliancesarenotofthesamemodelorsoftwareversion,therecommendedform

ofGSAmigrationwouldbetomigrateconfigurationsonly,andreindexallcontentonthenewappliances.

However,ifmigrationviamirroringisdesired,andassumingthatthenewGSAmodeliscompatiblefor

mirroringwiththeexistingGSAmodelinuse,anapproachthatcouldbetakenwouldbetoupgradean

existingappliance(eg.backupreplicaappliancefromtheexistingmirroringnetwork),thenmirrorthe

upgradedGSAtooneofthenewappliances,andusethisGSAasamasterinanewGSAmirroring

network.Inthisscenario,thefollowinggeneralstepswouldbetaken:

1. Pausethecrawlfromtheprimarymasterappliance.

2. Removeabackupappliancefromtheexistingmirroringnetwork.

3. Upgradethisappliancetothesameversionasthenewappliance(s).

4. Configuremirroringfromthisbackupappliancetoanewappliance,andcompletethesync.

5. Disablemirroringbetweenthebackupapplianceandthenewappliance.

6. Configuremirroringonthenewappliancetomakeittheprimarymasterofanewmirroring

configuration.

7. Addadditionalnewappliance(s)tothenewmirroringnetwork.

8. Cutovertonewappliancesanddecommissionoldappliances.

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Google Search Appliance Upgrade and Migration Handbook Bedienungsanleitung Seite 18