Veritas Volume ManagerWord文档下载推荐.docx

Veritas Volume ManagerWord文档下载推荐.docx

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VolumeManagerdisks

1.4 

Subdisks

1.5 

Plexes

1.6 

Volumes

1.7 

VolumeMangerObjects&

theirRelationship

2. 

VolumeManagerConfiguration（optionsmenu）

2.1 

Addorinitializeoneormoredisks 

2.2 

Encapsulateoneormoredisks 

2.3 

Removeadisk 

2.4 

Removeadiskforreplacement

2.5 

Replaceafailedorremoveddisk 

2.6 

Mirrorvolumesonadisk

2.7 

Movevolumesfromadisk 

2.8 

Enableaccessto（import）adiskgroup

2.9 

Removeaccessto（deport）adiskgroup 

2.10Enable（online）adiskdevice 

2.11Disable（offline）adiskdevice 

2.12Markadiskasaspareforadiskgroup

2.13Turnoffthespareflagonadisk 

AboutVeritasvolumemanager:

VeritasVolumeManagerisasoftwareproductfromveritasInc.anditisusedtomanagediskstorage.

Themainfeaturesofvolumemanagerarefollowing:

1.Allowscreationoflogicalvolumesspanningovermultipledisks.Thisovercomesthephysicallimitofthedisk.

2. 

ProvideshighavailabilitystoragesolutionsthroughRAID,Mirroringofdisks.

3.Providesfailoverfeaturesbyprovidingtransferablediskgroupownershipbetweensystems.

4. 

Dynamicreconfigurationofdiskstorageinanonlinesystemstate.whatisveritasvolumemanager.

Thefollowing 

articledescribesthevolumemanagerobjectsandconfigurationofthese 

objectsusingatextmenubasedutilitycalledvxdiskadm.

1.0 

Disks

Disksarereferredinvolumemanagerbytwoterms- 

device 

name 

anddiskname.Thedevicenamespecifiescontroller,targetidandsliceof 

thedisk.Disknameisthecommonnamegiventothedevicenameasaneasytoremember 

name.

Forexampledevicenamec2t3dos2 

represents 

controller 

number2,targetid3,diskgroup0andslice2anddisk01maybeitsdiskname.Whiledevicenameissystemdependentbasedoncontrolleranddiskid 

the 

disknameisuserdefined. 

Diskgroups:

∙Adiskgroupisacollectionofvolumemanagerdisksgroupedtogethertoholdthedata.Alltheconfigurationchanges 

madetoadiskgroupareappliedtothedisksinthatdiskgrouponly. 

∙VolumeManagerobjectscannotspandiskgroupsi.e.alltheoperationsonaparticulardiskgroupremainsconfinedtothatparticulargroup.

∙Diskgroupsenablehighavailabilityasthesecanbesharedbytwoormorehosts 

butcanbeaccessedbyonlyonehostatatime.Intwohostsandasharedstoragesituationone 

hostcantakeovertheownershipof 

thediskgroupsanddrives 

incaseother 

hostfails.

VolumeManagerdisks

∙Addingphysical 

disks 

tothevolumemanagerresultsincreationof 

publicandprivateregioninthediskbythevolumemanager.Thepublicregionisthediskspaceavailableforvolumespaceandtheprivateregionstorestheconfigurationinformation. 

∙AVolumeManager 

disksarecreatedfromthepublicregionofaphysicaldiskthatisunderVolumeManagercontrol.Eachvolumemanagerdiskcorrespondstoonephysicaldisk.

∙ 

Avolumemanagerdiskisgivenadiskmedianamewhenitisaddedtoadiskgroupwhichcanbedefaultoruniqueuserdefined..

∙Onceavolumemanagerdiskisassignedadiskmedianame,thediskisnolongerreferredtobyitsphysicaladdressofc#t#d#.Thephysicaladdressofc#t#d#becomesknownasthediskaccessrecord.

Subdisks

∙Asubdiskisasubsectionofadisk'

spublicregion 

andis 

thesmallestunitofstorageinVolumeManager. 

∙Asubdiskisdefinedbyanoffsetandalengthinsectorsonavolumemanagerdisk.

∙Avolumemanagerdiskcancontainmultiplesubdisks 

butsubdiskscannotoverlaporsharethesameportionsofavolumemanagerdisk.

∙volumemanagerdiskspacethatisnotreservedorthatisnotpartofasubdiskisfreespace.Youcanusefreespacetocreatenewsubdisks.

Asubdiskissimilartoapartitionbutwithfollowingdifferences:

∙Themaximumnumberofpartitionstoadiskiseight.

∙Thereisnotheoreticallimittonumberofsubdisksthatcanbeattachedtoasingleplex,butithasbeenlimitedtoadefaultvalueof4096.Ifrequired,thisdefaultcanbechanged,usingthevol_subdisk_numtunableparameter.

Plexes

∙Aplexisastructuredororderedcollectionofsubdisksthatrepresentsonecopyofthedatainavolume.Aplexconsistsofoneormoresubdiskslocatedononeormorephysicaldisks.

∙Aplexisalsocalledamirror.Thetermsplexandmirrorcanbeusedinterchangeably,eventhoughaplexisonlyonecopyofthedata.Theterms"

mirrored"

or"

mirroring"

implytwoormorecopiesofdata.

∙Thelengthofaplexisdeterminedbythelastblockthatcanbereadorwrittenonthelastsubdiskintheplex.

∙Thedefaultnamingconventionforplexesin