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•RAID1:mirroringwithoutparityorstriping

RAID1usesmirroringsothatdatawrittentoonedriveissimultaneouslywrittentoanotherdrive.Thisis

goodforsmalldatabasesorotherapplicationsthatrequiresmallcapacitybutcompletedataredundancy.

RAID1providesfaulttolerancefromdiskerrorsorfailuresandcontinuestooperateaslongasatleast

onedriveinthemirroredsetisfunctioning.Withappropriateoperatingsystemsupport,therecanbe

increasedreadperformanceandonlyaminimalwriteperformancereduction.

RAID1requiresaminimumnumberoftwoharddiskdrives.

•RAID5:block-levelstripingwithdistributedparity

RAID5usesdiskstripingandparitydataacrossalldrives(distributedparity)toprovidehighdata

throughput,especiallyforsmallrandomaccess.RAID5distributesparityalongwiththedataandrequires

alldrivesbutonetobepresenttooperate;drivefailurerequiresreplacement,butthearrayisnot

destroyedbyasingledrivefailure.Upondrivefailure,anysubsequentreadoperationscanbecalculated

fromthedistributedparitysothatthedrivefailureismaskedfromtheenduser.Thearraywillhavedata

lossintheeventofaseconddrivefailureandisvulnerableuntilthedatathatwasonthefailingdriveis

rebuiltontoareplacementdrive.Asingledrivefailureinthesetwillresultinreducedperformanceof

theentiresetuntilthefailingdrivehasbeenreplacedandrebuilt.

RAID5requiresaminimumnumberofthreeharddiskdrives.

•RAID10:acombinationofRAID0andRAID1

RAID10consistsofstripeddataacrossmirroredspans.ARAID10drivegroupisaspanneddrive

groupthatcreatesastripedsetfromaseriesofmirroreddrives.RAID10allowsamaximumofeight

spans.YoumustuseanevennumberofdrivesineachRAIDvirtualdriveinthespan.TheRAID1

virtualdrivesmusthavethesamestripesize.RAID10provideshighdatathroughputandcompletedata

redundancybutusesalargernumberofspans.

RAID10requiresaminimumnumberoffourharddiskdrivesandalsorequiresanevennumberofdrives,

forexample,sixharddiskdrivesoreightharddiskdrives.

•RAID50:acombinationofRAID0andRAID5

RAID50usesdistributedparityanddiskstriping.ARAID50drivegroupisaspanneddrivegroupin

whichdataisstripedacrossmultipleRAID5drivegroups.RAID50worksbestwithdatathatrequires

highreliability,highrequestrates,highdatatransfers,andmedium-to-largecapacity.

Note:HavingvirtualdrivesofdifferentRAIDlevels,suchasRAID0andRAID5,inthesamedrivegroupis

notallowed.Forexample,ifanexistingRAID5virtualdriveiscreatedoutofpartialspaceinanarray,the

nextvirtualdriveinthearrayhastobeRAID5only.

RAID50requiresaminimumnumberofsixharddiskdrives.

FordetailedinformationaboutRAID,referto“IntroductiontoRAID”intheMegaRAIDSASSoftwareUser

GuideonthedocumentationDVDthatcomeswithyourserver.

RAIDforyourserver

ThistopicprovidesinformationabouttheRAIDsupportedbyyourserver.

YourserversupportsthefollowingtwotypesofRAIDcongurations:

74ThinkServerTS430HardwareMaintenanceManual

Lenovo ThinkServer TS430 Hardware Maintenance Manual

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