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Chapter4.ConfiguringRAID
ThistopicprovidesinformationaboutRAIDandtheutilityprogramsthatareavailableforyoutoconfigure
RAID.
Note:Afterthestoragearrayisidentifiedbytheserverthatitisconnectedto,refertothedocumentation
thatcomeswiththeRAIDcardorHBAinstalledintheservertoconfigurethestoragearray.
Thistopiccontainsthefollowingitems:
•“AboutRAID”onpage27
•“ConfiguringtheadvancedSATA/SAShardwareRAID”onpage28
AboutRAID
RAID,anacronymforRedundantArrayofIndependentDisks,isatechnologythatprovidesincreased
storagefunctionsandreliabilitythroughredundancy.Thisisachievedbycombiningmultipleharddiskdrives
intoalogicalunit,wheredataisdistributedacrossthedrivesinoneofseveralwayscalledRAIDlevels.
WhenagroupofindependentphysicalharddiskdrivesaresetuptouseRAIDtechnology,theyareina
RAIDarray.Thisarraydistributesdataacrossmultipleharddiskdrives,butthearrayappearstothehost
serverasonesinglestorageunit.CreatingandusingRAIDarraysprovideshighperformance,suchasthe
expeditedI/Operformance,becauseseveraldrivescanbeaccessedsimultaneously.
RAIDdrivegroupsalsoimprovedatastoragereliabilityandfaulttolerancecomparedwithsingle-drive
storagesystems.Datalossresultingfromadrivefailurecanbepreventedbyreconstructingmissingdata
fromtheremainingdrives.
ThefollowinglistdescribessomeofthemostcommonlyusedRAIDlevels:
•RAID0:block-levelstripingwithoutparityormirroring
SimplestripesetsarenormallyreferredtoasRAID0.RAID0usesstripingtoprovidehighdata
throughput,especiallyforlargefilesinanenvironmentthatdoesnotrequirefaulttolerance.RAID0hasno
redundancyanditprovidesimprovedperformanceandadditionalstoragewithoutfaulttolerance.Any
drivefailuredestroysthearrayandthelikelihoodoffailureincreaseswithmoredrivesinthearray.RAID
0doesnotimplementerrorchecking,soanyerrorisuncorrectable.Moredrivesinthearraymeans
higherbandwidth,butgreaterriskofdataloss.
RAID0requiresaminimumnumberoftwoharddiskdrives.
•RAID1:mirroringwithoutparityorstriping
RAID1usesmirroringsothatdatawrittentoonedriveissimultaneouslywrittentoanotherdrive.Thisis
goodforsmalldatabasesorotherapplicationsthatrequiresmallcapacitybutcompletedataredundancy.
RAID1providesfaulttolerancefromdiskerrorsorfailuresandcontinuestooperateaslongasatleast
onedriveinthemirroredsetisfunctioning.Withappropriateoperatingsystemsupport,therecanbe
increasedreadperformanceandonlyaminimalwriteperformancereduction.
RAID1requiresaminimumnumberoftwoharddiskdrives.
©CopyrightLenovo2014
27
- ThinkServerStorageSA120 1
- •“Safetyinformation”onpageiii 2
- •AppendixA“Notices”onpage75 2
- Contents 3
- Index..................81 4
- Safetyinformation 5
- ©CopyrightLenovo2014 11
- Productsthatarenotassessed 12
- Chapter1.Generalinformation 13
- Documentation 14
- Chapter1.Generalinformation3 15
- Chapter2.Productoverview 17
- Productpackage 18
- Features 18
- Chapter2.Productoverview7 19
- Specifications 20
- Locations 20
- .Productoverview9 21
- Frontviewofthestoragearray 22
- Rearviewofthestoragearray 22
- Storagearraycomponents 24
- .Productoverview13 25
- CRUidentification 26
- LEDsonthefrontpanel 27
- Drive-statusLEDs 29
- Backplane 30
- Connectingthestoragearrays 31
- .Productoverview21 33
- .Productoverview23 35
- Turningonthestoragearray 37
- Turningoffthestoragearray 37
- Chapter4.ConfiguringRAID 39
- Chapter5.Updatingthefirmware 41
- Guidelines 43
- Precautions 43
- Systemreliabilityguidelines 44
- 8.Dooneofthefollowing: 50
- Figure27.Removingapowersupply 53
- Replacingthefanassembly 54
- Figure29.Removingafanassembly 55
- Figure31.RemovinganI/Omodule 56
- Figure33.Removingthescrew 58
- Figure35.Removingthedrivecage 59
- Figure36.Installingadrivecage 59
- Replacingthebackplane 60
- Figure37.Removingthecover 61
- Figure38.Removingthebackplane 62
- 1tothebottomofthechassis 63
- Figure40.Reinstallingthecover 64
- Troubleshootingprocedure 71
- Usingadiagnosticprogram 71
- Usingthecommandlineinterface 71
- Basictroubleshooting 72
- Informationresources 75
- Usingthedocumentation 75
- ThinkServerWebsite 75
- LenovoSupportWebsite 75
- Helpandservice 76
- Beforeyoucall 76
- Callingforservice 76
- Usingotherservices 77
- Purchasingadditionalservices 77
- Part1-GeneralTerms 79
- Part2-Country-specificTerms 81
- AppendixA.Notices 87
- Trademarks 88
- Importantnotes 88
- Particulatecontamination 88
- ImportantWEEEinformation 89
- AppendixA.Notices79 91
- Eurasiancompliancemark 92
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