Specifications

Storage Subsystem Guide 15
3 Configuring SGI InfiniteStorage
Arrays
Specifications
ThespecificationsforeachsupportedRAIDcontrollerenclosureordriveshelf
expansionmaybefoundasdescribedbelow:
Storage Characteristics
TheSGIInfiniteStoragefamilyofstoragecontrollerenclosuresusehardware
RAIDcontrollers,whichprovidecompleteRAIDfunctionalityandenhanced
diskfailuremanagement.
ThedriveshelfexpansionenclosuresattachtotheRAIDcontrollersinorderto
expandtheamountofstorageavailable.
RAID Controllers TheRAIDcontrollersoperateasanActive/Active(A/A)pairwithinthesame
rack.BothRAIDcontrollerscanactivelyprocessdiskI/Orequests.Shouldone
ofthetwoRAIDcontrollersfail,thestorageserverreroutestheI/O
transparentlytotheothercontroller,whichstartsprocessingdiskI/Orequests
forbothcontrollers.
Hot Spare Disk
Whenthefaileddiskisreplaced,theRAIDcontroller’sCopyBackprocesswill
automaticallymovethereconstructeddatafromthediskthatwasthehot
sparetothereplacementdisk.Thehotsparediskwillthenbemadeavailable
forfutureuse.
Ifitisnecessarytoremoveandreplacefaileddisks,
itispossibletoperform
“hotswap”operations.Inahotswap,anofflineorfaileddiskisremovedand
Enclosure EnclosureType Page
InfiniteStorage220 RAIDController 12
InfiniteStorage220 DriveShelfExpansion 12
InfiniteStorage
15000
RAIDController 13
InfiniteStorage
15000
DriveShelfExpansion 13