Dell SC8000 - Adding to an Existing SAS Enclosure Chain

Appendix A Adding or Removing an Enclosure
186 Storage Center SC8000 Controller Deployment Guide
Adding to an Existing SAS Enclosure Chain
Thefollowingexampleshowshowtoinsertanenclosureintoanexistingenclosurechain
byconnectingtheenclosuretoonesideoftheenclosurechainatatime.Duringthis
process,onesideoftheenclosurechainisdisconnected,andtheStorageCenterfailsover
tothesidethatremainsconnected.
Check the Lead Controller
IdentifytheleadcontrollerbycheckingcontrollersummaryinformationinSystem
Manager.ThesecablinginstructionsassumethatControllerAisthelead controller.
1 IntheStorageCenterSystemManager,selecttheControllersnode.
2 Inthecontrollersummarypanenotewhichcontrollerisidentifiedastheleader.
Check Current Disk Count
CheckthecurrentnumberofdrivesaccessiblebytheStorageCentertouseasacomparison
afteranewenclosureisadded.
1 Fromaworkstationconnectedtothenetwork,opentheStorageCenterSystem
Manager.
2 IntheStorageCenterSystemManager,selectStorageManagement→System→
Setup→Configure LocalPorts.
3 MaximizetheConfigureLocalPortwizardsothatyoucanseetheTargetCount
column,andnotethenumberofdrivescurrentlyviewedbythecontrollers.This
numberincreaseswhennewenclosuresareadded.Whenaddingenclosurestoan
existingconfiguration,addenclosurestotheendofthechain.
Add an Enclosure to an Existing Chain Currently in Service
Disconnectthechainonesideatatimetomaintaindriveavailabilitywhileaddingan
enclosure.
1 DisconnecttheA‐sidecablesfromthecontrollersasshowninFigure 118onpage 187:
 ControllerA,slot6port1
 ControllerB,slot6port3
IOcontinuesthroughtheB‐sidecables.
2 Turnoneachoftheenclosuresbeingadded.Whentheenclosuresspinup,makesure
thatthefrontpanelenclosureandpowerstatusLEDsshownormaloperation.
3 MovethecablefromEnclosure2:top,portB→Enclosu r e
4:top,port B.
4 UsenewcablestoconnectthenewenclosurestotheA‐sidecabling(Figure 118on
page 187):
 Enclosure2:top,portB→Enclosure3:top,portA.
 Enclosure3:top,portB→Enclosure4,top,portA.
Enclosures3and4arenowpartoftheAsidechainandcanbeconnectedtoControllers
AandB.
Caution: Beforeaddinganenclosuretoanexistingchain,makesurethatyourdata
isbackedup.Formaximumprotection,addenclosuresduringaserviceoutage.