Google Search Appliance Upgrade and Migration Handbook Uživatelský manuál Strana 14

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Chapter4MigrationPlanning
Overview
ThefollowingsectionsprovideguidanceinmigratingGoogleSearchAppliancesinvariousdeployment
scenarios.
Migrationmethods
Therearetwomethodsofmigratingasinglesearchappliancetoanother:
Migratingsearchindexandconfigurations
Migratingconfigurationsonly
Migratingsearchindexandconfigurations
GSAMirroringisafeatureprimarilyusedtoprovidehighavailabilityandhighcapacityserving,butitcan
alsobeusedformigratingconfigurationsandsearchindexesbetweenappliances.Infact,mirroringisthe
onlymeanstocompletelymigrateanindexfromoneGoogleSearchAppliancetoanother,andshouldbe
usedforGSAmigrationwheneverpossible.
Thismigrationmethodismostappropriatewhen:
Reindexingofallcontenttakessignificanttime,duetolargeindexsizeorslowcrawlrates
Nochangesareplannedtodeploymentarchitectureandcontentsourceintegration
Featuresinthenewsoftwarereleaseonthenewappliance(s)donotrequirereindexingofcontent
(refertoversionreleasenotesforguidance)
Advantagesofthismigrationmethod:
Savestimeincontentindexing(mirroringismuchfasterthanreindexingofcontent)
Minimaluserimpactonexistingproductionsearchexperience,asthenewappliance’ssearchindex
willbeanexact“replica”oftheexistingappliance
Disadvantagesofthismigrationmethod:
Procedureismorecomplicatedthanmigratingconfigurationonly
Thecrawlcycleontheproductionsystemwillbetemporarilypausedandnewcontentwillnotbe
acquiredduringthemigrationprocess
Requirements
Formirroringtobeconfigured,bothsearchappliancesmustmeetthefollowingrequirements:
TheymustbeonthesameGSAversion,andbeofv6.8orhigher
Theymustbeofcompatiblesearchappliancemodels
ThemasterGSAmustbelicensedforequalorlowerdocumentcountthanthereplicaGSA
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