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Dell SC8000 - Connect the Back End

Dell SC8000
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Dell Compellent 55
3 Connect the Back End
EnclosuresareconnectedtocontrollersusingSAS,apointtopointswitchedtopologyon
fourlanes.EachlanecanperformconcurrentIOtransactionsat6Gb/sec.DellCompellent
recommendsconnectingtheSASdriveenclosurestothecontroller(s)usingthemost
redundantoptionsthatareavailable.
Contents
SASEnclosureCablingGuidelines ............................................. 55
ConnectIPC
forDualControllerStorageCenters ................................ 56
ConnectSC200/SC220Enclosures ............
.................................. 60
ConnectSC280Enclosures ..............
...................................... 75
ConnectENSASx6x12/24Enclosures ........
.................................. 84
LabeltheBackEndCables ............
........................................ 93
SAS Enclosure Cabling Guidelines
MultipleSASenclosuresareconnectedtoacontrollerbycablingtheenclosuresinseries.A
seriesofinterconnectedenclosuresisreferredtoasachain.Eachchaincancontainupto
1686GbpsSASdrives.
ASASchainbeginsataninitiatorportinacontrollerIOcardandconnects
tothefirst
enclosure.Subsequentenclosuresareconnectedinseries.ForsinglecontrollerStorage
Centers,thechainendsatthelastenclosure.FordualcontrollerStorageCenters,thechain
endsinatargetportintheoppositecontroller.
SAS Redundancy
RedundantSAScablingensuresthatintheeventanIOCardorportfails,IOcontinuesto
flowthroughtheremainingfunctioningpath(s).FordualcontrollerStorageCenters,
redundantcablingalsoprovidesprotectionforcontrollerfailures.Toachieveredundancy,
eachSASchainismadeupoftwopathsthatarereferred
toastheAsideandBside.

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