Dell Compellent 95
4 Connect the Front End
Front‐endcablingreferstoconnectionsbetweenthecontrollerandtheserver.Front‐end
connectionscanbemadeusingiSCSI,FibreChannel,orFibreChanneloverEthernet
(FCoE).DellCompellentrecommendsconnectingserverstothecontroller(s)usingthe
mostredundantoptionsavailable.
Contents
Typesof RedundancyforFront‐EndConnections ............... ................. 95
MultipathIO ...........
..................................................... 96
Front‐EndConnectivityModes .............................................
... 96
FibreChannelZoning .............................................
.......... 102
ConnecttheFrontEndforaSingle‐ControllerStorageCenter .................. .. 103
ConnecttheFrontEndforaDual‐ControllerStorage
Center ............ ......... 105
LabeltheFront‐EndCables .......................
........................... 116
Types of Redundancy for Front-End Connections
Front‐endredundancyisachievedbyeliminatingsinglepointsoffailurethatcouldcause
aservertoloseconnectivitytotheStorageCenter.
DependingonhowtheStorageCenterisconfigured,thefollowingtypesofredundancy
areavailable.
Pathredundancy:WhenmultiplepathsareavailablefromaservertoaStorageCenter,
aserverconfiguredformultipathIO(MPIO)canusemultiplepathsforIO.Ifapath
fails,theservercontinuestousetheremainingactivepath(s).
Controllerredundancy:Ifonecontrollerfailsinadual‐controllerStorageCenter,the
front‐endportsfailovertothefunctioningcontroller.Bothfront‐endconnectivity
modes(legacymodeandvirtualportmode)providecontrollerredundancy.
Portredundancy:Invirtualportmode,ifaportgoesdownbecauseitisdisconnected
orthereisahardwarefailure,theportcanfailovertoanotherfunctioningportinthe
samefaultdomain.Portredundancyisavailableforsingle‐controlleranddual‐
controllerStorageCentersoperatinginvirtual
portmode.
See Also
MultipathIOonpage 96
LegacyModeonpage 99
VirtualPortModeonpage 97
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