Raid faq

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FAQ | RAID
What is the recovery process for software data RAID 1?
Linux®softwareRAIDmanagementisdonewiththemd(4)devicelesandmdadm(8)command.Thesystem
administratorshouldbefamiliarwiththissoftwareset.
Mdadm with the –monitoroptiongivesinformationaboutRAIDstatus.
IfadriveinRAID1hasfailed,itcanberemovedfromtheRAIDsetusing–manage –removefollowedbyanunmountof
therawdevice.Anewdrivecanbeaddedwith–manage –add.Then,therebuildingstatuscanbeviewedwith
the –monitor mode.
TorecoverfromasoftwareRAID1usingWindows,youmustrstdeterminewhichdrivehasfailed.Thedriveshouldbe
replacedwiththesametypeofdrivethathasfailed.Next,enterintotheDiskManagementsnap-infortheMicrosoft
ManagementConsole.TheDiskManagementsnap-inwillrecognizethatthereisafailedarray.Followtheon-screen
stepstorecovertheRAID1array.
How am I notied that a drive might fail so that I can replace it before it fails?
Insomecases,pre-failurewillshowupasaSMARTeventnoticationatboottime.Thesenoticationswillappearwhen
theoptionROMpostsstatus.Thesystemwillnotstoponanevent,sotheusermustbeobservantatboottime.Oncein
theOS,TheIntelGUI(balloonstatusmessages),LSIMegaRAIDStorageManager(pop-up),orMSWindows(pop-up)may
alerttheuserthaterrorsareoccurringorthatSMARTeventshaveoccurredonthedrive.Othersubtleindicatorsinclude
areductioninsystemperformance,HDDLEDremainingonconstantly(donotconfusewithWindowsdefragactivityor
RAIDinitialization/rebuildactivitywhichwillalsoresultintheHDDLEDbeingonconstantly),andclickingsoundscoming
fromamechanicaldrive.
How long should it take to recover?
RecoverytimevariesgreatlydependingonthesizeandtypeofRAIDbutmaytakeseveralhours.Theusershouldexpect
reducedperformanceduringarebuild.
Can HP Support help with the recovery process?
Duringthewarrantyperiod,anHPSupportagentcanassistyouinrestoringtheoriginalOSbacktoyoursystem—including
toafactoryconguredRAIDarray.NotethatmanyadvancedRAIDcongurationsmaybeoutsidethescopeofwarranty
support.Inthesecases,youwillberesponsibleforrebuildingyourcongurationtomeetyourspecicRAIDrequirements.
©Copyright2014-2015Hewlett-PackardDevelopmentCompany,L.P.Theinformationcontainedhereinissubjecttochangewithoutnotice.Theonly
warrantiesforHPproductsandservicesaresetforthintheexpresswarrantystatementsaccompanyingsuchproductsandservices.Nothingherein
shouldbeconstruedasconstitutinganadditionalwarranty.HPshallnotbeliablefortechnicaloreditorialerrorsoromissionscontainedherein.
IntelisatrademarkofIntelCorporationintheU.S.andothercountries.MicrosoftandWindowsareU.S.registeredtrademarksoftheMicrosoftgroupof
companies.Linux®istheregisteredtrademarkofLinusTorvaldsintheU.S.andothercountries.
4AA5-8637ENW,July2015