StorageMgtUsingVDSandVSS.docx

StorageMgtUsingVDSandVSS.docx

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StorageMgtUsingVDSandVSS

StorageManagementUsingWindowsServer™ 2003andWindows®StorageServer 2003VirtualDiskServiceandVolumeShadowCopyService

MicrosoftCorporation

August2003

Abstract

Managingstoragecomplexityisnolongeraproblemrestrictedtoenterprise-sizedorganizations;increasingly,midsizeandevenrelativelysmallbusinesseshaveundergonedramaticdatagrowthandconsequentlyrequiregreatersophisticationinstorageresourceprovisioningandmanagement.Asstorageadministratorslooktocomplementdirectattachedstoragewithnetworkedstoragesolutions,CEOsandbusinessmanagerslooktotheirstorageadministratorstoprovidesolutionsthatdeliverlowerITcosts,improvedoperationalefficiency,andincreasedbusinesscompetition.Effectivestoragemanagementiskeytoensuringthesesolutions.

WindowsServer 2003andWindowsStorageServer 2003providetwonewstorageinfrastructures—theVirtualDiskservice（VDS）andVolumeShadowCopyservice（VSS）.Theseservicesallowthestorageadministratortomanagecomplexstorageconfigurations（includingmulti-vendorconfigurations）moreeffectively,thushelpingtorealizethebusinessgoalofhighlyavailabledataatlowercost.

ThiswhitepaperdescribesboththebusinessbenefitsofVSSandVDS,andthetechnologicaldetailsoftheservices.Section1introducesVDSandVSSservicestothetechnologicaldecisionmaker,andexplainshowtheserviceshelptoreducestoragemanagementcomplexity.Section2offersthetechnicaldetailsoftheservices,andisintendedforstorageadministratorswhoneedtounderstandhowtheservicesworktocorrectlydeploystoragesolutions.

TheinformationcontainedinthisdocumentrepresentsthecurrentviewofMicrosoftCorporationontheissuesdiscussedasofthedateofpublication.BecauseMicrosoftmustrespondtochangingmarketconditions,itshouldnotbeinterpretedtobeacommitmentonthepartofMicrosoft,andMicrosoftcannotguaranteetheaccuracyofanyinformationpresentedafterthedateofpublication.

ThisWhitePaperisforinformationalpurposesonly.MICROSOFTMAKESNOWARRANTIES,EXPRESSORIMPLIED,ASTOTHEINFORMATIONINTHISDOCUMENT.

Complyingwithallapplicablecopyrightlawsistheresponsibilityoftheuser.Withoutlimitingtherightsundercopyright,nopartofthisdocumentmaybereproduced,storedinorintroducedintoaretrievalsystem,ortransmittedinanyformorbyanymeans（electronic,mechanical,photocopying,recording,orotherwise）,orforanypurpose,withouttheexpresswrittenpermissionofMicrosoftCorporation.

Microsoftmayhavepatents,patentapplications,trademarks,copyrights,orotherintellectualpropertyrightscoveringsubjectmatterinthisdocument.ExceptasexpresslyprovidedinanywrittenlicenseagreementfromMicrosoft,thefurnishingofthisdocumentdoesnotgiveyouanylicensetothesepatents,trademarks,copyrights,orotherintellectualproperty.

Thecompanies,organizations,products,peopleandeventsdepictedinexampleshereinarefictitious.Noassociationwithanyrealcompany,organization,product,personoreventisintendedorshouldbeinferred.

©September2003MicrosoftCorporation.Allrightsreserved.

Microsoft,WindowsServer 2003,andWindowsStorageServer 2003areeitherregisteredtrademarksortrademarksofMicrosoftCorporationintheUnitedStatesand/orothercountries.

Thenamesofactualcompaniesandproductsmentionedhereinmaybethetrademarksoftheirrespectiveowners.

Contents

Introduction1

I.Overview2

VirtualDiskService3

StandardizedInterfaceforMulti-VendorStorage3

DiskManagementforBasic,FaultTolerantandHighPerformanceStorageSolutions5

StorageResourceProvisioning6

AdvancedStorageFunctions6

UsewithVSSShadowCopies6

VolumeShadowCopyService7

TapeBackups:

Limitations7

HighFidelityCopiesforBackupandRapidRestores7

HighFidelityBackups8

Transport8

Microsoft-VendorPartnerships9

II.TechnicalDetails10

OverviewtoVSSandVDSDesign11

SoftwareProviders11

HardwareProviders11

VirtualDiskService13

DISKPART13

DISKRAID14

ManagingStorageArrays14

ManagingStorageonaSAN15

VolumeShadowCopyService16

ShadowCopyCreation:

Methods16

VSSComponentsInvolvedintheShadowCopyCreationProcess17

CoordinationofShadowCopyCreation:

theCompleteSequence17

VSSforFastBackupsandRestores18

VSSforIndividualFileRestores18

VSSforTransport:

TapeBackups,DataMining,andTesting20

SupportforVSS-basedSolutions21

Summary23

RelatedLinks24

Introduction

Keepingstoreddatasecureandaccessiblearethekeystoeffectivestoragemanagement.Storagesystemsandresourcesmustbe:

∙Configuredsothatapplicationshaveaccesstotheappropriatetypeofstorageresourcesandcanusethoseresourceseffectively.

∙Allocated（provisioned）toservers,applicationsandusers.

∙Monitoredforproblems,andprovisionsmadetoensurerapidrecoveryfromproblems,sothatthebusinessisminimallyimpacted.

∙Inventoried,maintainedandupgradedasnecessary.

Managingnetworkedstorage—particularlystorageareanetworks（SANs）—makesfundamentallydifferentdemandsontheadministratorthandoesmanaginglocal（directlyattached）storage.Directattachedstorage（DAS）causesmanagementheadachesbecausestorageresourcesaretiedtotheserversandthedistributionofthoseresourcesisdifficult.Networkedstorage,ontheotherhand,consolidatesstorageresources,whichintroducesanumberofmanagementissuesaroundtheareaofsharedstorage,includingdiscovery（determiningwhatstoragedevicesareattachedtothenetwork）,accesstodevices,androutingforfaulttolerance.Consequently,increasingnumbersofbusinessesarehiringstorageadministratorsintotheranksofsystemandnetworkadministrators.

Hiringadditionalstaff,however,isnotthefullsolution.Althoughhighendsingle-vendorstoragemanagementsolutionsforenterprise-sizedorganizationshavebeenonthemarketforsometime,increasinglysophisticatedstoragemanagementtools—designedtoworkwithstoragedevicesfrommultiplevendors—havebeenlackingforthesmallandmidsizebusiness.Thedevelopmentofsuchtoolscaneasethecomplexityofstoragemanagementtasksforallbusinessesseekingtoimplementnetworkedstoragesolutions.

TheWindowsVirtualDiskservice（VDS）andVolumeShadowCopyservice（VSS）,introducedinMicrosoft®Windows®Server™ 2003andMicrosoft®Windows®StorageServer 2003,aredesignedtoaddresstwokeyareasofstoragemanagement:

∙DiskManagement.VDSprovidestheinfrastructureusedtomanagestorageresources—disksandvolumes—sothatbothdirectlyattachedandnetworkedstorageresourcescanbe“carvedup”andmadeavailableforuse.

∙DataProtection.VSSistheinfrastructurethatenablesapplication-awaresnapshottingcapabilities（shadowcopies）.Snapshottingtechnologyprovidesthebasisforanumberofstoragemanagementsolutions,includinghighfidelitypoint-in-timecopiesforbackup,datatransport,andend-usersinglefilerestores.

Part1ofthispaperprovidesanoverviewofthenewVDSandVSSservices,andisintendedtobereadbythetechnicalbusinessdecisionmakerandthestorageadministratorseekinganintroductorylevelexplicationoftheseservices.

Part2providesatechnicaldiscussionofVDSandVSSsolutions,andprimarilytargetsthestorageadministratorwhoisresponsibleforunderstandingandeffectivelymanagingcomplexstoragesolutions.

I.Overview

ThefollowingsectionprovidesanintroductiontoandthebusinessadvantagesoftwonewservicesinWindowsServer 2003andWindowsStorageServer 2003products,theVirtualDiskserviceandtheVolumeShadowCopyservice.

VirtualDiskService

Anincreasingnumberoforganizationshaveawiderangeofsystemconfigurations,allrequiringrobustdiskandstoragesubsystemmanagement.Theseinclude:

∙Laptopsandothersystemswithoneorafewdisks.Thestorageinthesesystemsisdirectlyattached—eitherembeddedorexternaltothesystem.Generally,suchsystemsrequireonlyminimaldiskmanagement—thepartitioningandformattingofthephysicaldiskstorage.Diskmanagementonthesesystemsshouldbesimpleandstraightforward.

∙Servers,NASappliances,andsimplestorageareanetwork（SAN）configurations.Thestorageinthesesystemsisnetwork-attached,ratherthandirectlyattachedtothesystem.Theseconfigurationsbenefitfrombothdiskandstoragesubsystemmanagementcapabilities.Ideally,themanagementinterfaceisbothsimpletonavigateandeffective.Themoretransparent（non-disruptive）thestoragemanagementisinthesesettings,thebetter.Taskslikemakingadditionalstorageresourcesavailabletoasystem,orre-establishingfaulttoleranceafteramirroreddrivefails,shouldnotdisruptproduction.

∙Largeorcomplexstorageconfigurations.Organizationswithenterprisestorageconfigurationsoftenhavespecializedrequirementsthatareapplication-orsite-specific.

VirtualDiskservicewasdesignedtomeetthediskandstoragesubsystemmanagementneedsforbothsmallandmidsizesystemconfigurationsfordirect,networkattachedandSAN-basedstorage.Additionally,itwasdesignedtobeabletoscaleuptoenterpriseconfigurationswithoutcompromisingthecomplexSANfunctionalityenabledbyhardwarevendors.

StandardizedInterfaceforMulti-VendorStorage

Asstoragenetworksgrow,manyadministratorsfindthemselvesaddingstoragedevicesfromavarietyofvendors.However,priortothereleaseofWindowsServer 2003,theadministratorcouldnotconfigurethesestoragedevicesfromwithintheWindowsplatform;instead,itwasnecessarytouseaseparatestoragemanagementapplication（andoftenaseparatemanagementc