Buffalo Technology HS-DTGL/R5 Home Theater Server User Manual


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TeraStation uses RAID (“RedundantArrayofIndependentDisks”)technologytocontrolthefour
harddrivesinyourTeraStation.RAIDmaybeconguredseveralways:
RAID Spanning-Allfourdrivesarestripedintoonelargedrive,givingthemaximumcapacityfor
yourTeraStation.ThissizeistheonelistedonyourTeraStation’sboxandshowsthetotalcapacity
oftheTeraStationwithnodatausedforredundancy.RAIDSpanningisfastandefcient,butwith
noredundancy,ifoneharddrivefails,alldataontheTeraStationislost.
RAID 1(mirroring)-Harddrives(orspannedpairsofharddrives)arearrangedinmirroredpairs.
Eachhalfofthepairreadsandwritesexactlythesamedata.Thiscostsyouhalfthetotalcapacity
ofyourTeraStation,butprovidesexcellentredundancy.Ifaharddrivefails,themirrorcontinues
tosupplydata,soyoumayworkonnormally.Youmayreplacethedamagedordefectivedriveat
anytime,andnormalRAID1mirroringwillthenbeautomaticallyrestored.
RAID 5(parity)-AlldrivesinaRAID5arrayreservepartoftheirdataspaceforparityinformation,
allowingalldatatoberecoveredifasingledrivefails.Theparityinformationtakesupaboutone
harddrive’sworthofspace,soifyousetupallfourdrivesintheTeraStationasaRAID5array,
yourusablecapacitywillbeabout3/4ofthetotalcapacityoftheTeraStation.RAID5isan
excellentcompromisebetweenefciencyandsecurity.Ifasingledrivefails,nodataislost.After
thedamagedordefectivedriveisreplaced,yourTeraStationwillautomaticallyrestorealldatato
thenewdriveandresumenormalRAID5operation.ThisishowyourTeraStationissetupout
ofthebox.
BuffaloTechnologyrecommends
RAID 5foritsexcellentbalanceofefciencyandsecurity.
Note on RAID Arrays
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