Specifications

System Drives and System Drive Groups
32 SGI InfiniteStorage NAS Server and Titan Server
TheCreateSystemDrivepagewillappear.
5. Specifytheparametersforthedrive.
IntheCreateSystemDrivepage,dothefollowing:
63to16disks,
>2TB
Providesacombinationof
stripingandtwodiskparity
checking.
Ifoneortwophysicaldisksfail
andahotsparediskisavailable,
thecontrollerautomatically
insertsthespareandbuildsonto
itthecontentsofthefaileddisk,
fromdataandparity
information
ontheremaining
disks.Formanyapplications,
RAID6offersthebest
compromisebetweencapacity,
reliability,andspeed.
Allparitydataisdistributedontwo
disks(dualparity),andparity
checkingprovidesredundancy
withouttheoverheadofhavingto
doublethediskcapacity.Provides
faulttolerancefortwodrivefailures,
making
largerRAIDgroupsmore
practical,especiallyforhigh
availabilitysystems.
Aslarge‐capacitydrivesbecome
morecommon,thisbecomes
increasinglyimportantbecause
large‐capacitydriveslengthenthe
timeneededtorecoverfromthe
failureofasingledrive.Singleparity
RAIDlevelsarevulnerabletodata
lossuntilthefaileddrive
isrebuilt,
andthelargerthedrive,thelonger
thetimetorebuild.Dualparity
reducestheamountoftimedatais
volatileduringtherecoveryofthe
faileddrive.
RAID
Level
SystemDrive
Size
DescriptionandFailover Advantages/Disadvantages