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Swift/RAID:ADistributedRAID
System
DarrellD.E.LongandBruceR.Montague
UniversityofCalifornia,SantaCruz
Luis-FelipeCabreraIBMAlmadenResearchCenter
ABSTRACT:TheSwiftVOarchitectureisdesignedto
providehighdataratesinsupportofmultimediatype
applicationsingeneral-purposedistributedenviron-
mentsthroughtheuseofdistributedstriping.Strþing
techniquesplacesectionsofasinglelogicaldataspace
ontomultiplephysicaldevices.TheoriginalSwiftpro-
totypewasdesignedtovalidatethearchitecture,but
didnotprovidefaulttolerance.Wehaveimplemented
anewprototypeoftheSwiftarchitecturethatprovides
faulttoleranceinthedistributedenvironmentinthe
samemannerasRAIDlevels4and5.RAID(Redun-
dantArraysofInexpensiveDisks)techniqueshave
recentlybeenwidelyusedtoincreasebothperformance
andfaulttoleranceofdiskstoragesystems.
ThenewSwift/RAIDimplementationmanagesall
communicationusingadistributedtransferplanex-
ecutorwhichisolatesallcommunicationcodefrom
therestofSwift.Thetransferplanexecutorisim-
plementedasadistributedfinitestatemachinethat
decodesandexecutesasetofreliabledata-transferop-
erations.Thisapproachenablesustoeasilyinvestigate
alternativearchitecturesandcommunicationsprotocols.
SupportedinpartbytheNationalScienceFoundationunderGrantNSFCCR-9111220andbytheOfficeof
NavalResearchunderGrantN00014-92-J-1807
@1994TheUSENIXAss
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