Spectra T950 - Page 71

Chapter 2 — Architecture Overview Fibre Channel Connectivity
November 2016 User Guide—Spectra T950 Library
71
For Partitions with a Drive or Drives as the Exporting Controller
 ThepartitionWWNisthesameastheWWNforthedrive.The
commandstocontrolthemotionoftheroboticswithinthepartitionare
sentfromthehosttotheexportingdrive’slogicalunitnumber1
(LUN1).Commandstocontroltheoperationoftheexportingdriveare
sentfromthehosttoLUN0ofthedrive.
 SeeWorldWideNamesforFibreChannelDrivesonpage73formore
informationaboutWWNsfordrives.
Fibre Channel Port Configurations
Oneorbothoftheexternalportsontheexportingcontrollercanbeusedto
providethenetworkconnectivityfortherobotics.
Single Port Connectivity Thesimplestconfigurationusesonlyoneofthe
interfaceportsontheexportingcontroller.Thisconfigurationworkswell
whenonlyasinglehostisconnectedtothelibrary.Whenmultiplehosts
areconnectedtothesameport,theymustsharethissinglecommunication
pathtotherobotics.Thistypeofconfigurationrequiresthehoststouse
devicesharingapplicationsoftwaretohandlethearbitrationforuseofthe
robotics.
Dual-Path Connectivity (RIMs and F-QIPs only) Aslightlymorecomplex
configurationusesbothinterfaceportsontheexportingcontrollerwith
eachconnectedtoadifferentlibrarypartition.Eachportisusedasan
independentcommunicationspath.Fromahostperspective,eachportis
viewedasaunique,independentpathtoapartition.Thetwoportscanbe

connectedtothesameorpossiblydifferentstorageareanetworks(SANs).
Thelibraryprocessesthemotioncommandsandrelaysthemtothe
partitionsintheorderthattheyarereceived.Thisisawaytoprovide
limitedvisibilitybetweenthepartitions.Ifyouhavemorethantwo
partitionsyoucanuseadditionalcontrollerstoprovideadditional
isolationbetweenpartitions.
Figure 35 Single port network connectivity to the exporting
controller.
A
B
SAN
Controller