Lenovo ThinkServer TD340 - Removing the Server Cover

•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.
ConfiguringRAIDusingtheThinkServerEasyStartupprogram
TheThinkServerEasyStartupprogramsimplifiestheprocessofconfiguringsupportedRAIDandinstalling
supportedWindowsandLinuxoperatingsystemsanddevicedriversonyourserver.Theuserguideforthe
programcanbeaccesseddirectlyfromtheprograminterface.
TheThinkServerEasyStartupprogramhasthefollowingfeaturesforRAIDconfiguration:
•ForusewithallsupportedRAIDcontrollers
•AutomaticallydetectshardwareandlistsallsupportedRAIDconfigurations
•Configuresoneormorediskarrayspercontrollerdependingonthenumberofdrivesattachedtothe
controllerandtheRAIDlevelselected
•Supportshot-sparedrives
•CreatesaRAIDresponsefilethatcanbeusedtoconfigureRAIDcontrollersonsimilarlyconfigured
Lenovoservers
See“UsingtheThinkServerEasyStartupprogram”onpage69
andviewtheuserguidefromthemain
interfaceoftheprogram.
SomeRAIDmanagementsoftwarealsoisprovidedontheThinkServerEasyStartupDVDtohelpyoumanage
RAIDarraysandRAIDcontrollersinanoperatingsystemenvironment.Afteryouentertheoperatingsystem,
Chapter5.Configuringtheserver73