Appendix A Adding or Removing an Enclosure178 Storage Center SC8000 Controller Deployment GuideAdding to an Existing SC280 Enclosure ChainThe following example shows how to insert an enclosure into an existing enclosure chainby connecting the enclosure to one side of the enclosure chain at a time.Check the Lead ControllerIdentify the lead controller by checking controller summary information in SystemManager. 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 CountCheck the current number of drives accessible by the Storage Center to use as a comparisonafter a new enclosure is added.1 In the Storage Center System Manager, select Storage Management→ System→Setup→ Configure Local Ports.2 Maximize the Configure Local Port wizard so that you can see the Target Countcolumn, and note the number of drives currently viewed by the controllers. Thisnumber increases when new enclosures are added.Add an Enclosure to an Existing Chain Currently in ServiceWhen adding enclosures to an existing configuration, add enclosures to the end of thechain. Disconnect the chain one side at a time to maintain drive availability while addingan enclosure.Connecting the Enclosure to the A Side1 Disconnect the A‐side cables from the controllers as shown in Figure 113 on page 180. Controller A: slot 3, port 1 Controller B: slot 3, port 3IO continues through the B‐side cables.2 Turn on the enclosure being added. When the disks spin up, make sure that the frontpanel enclosure and power status LEDs show normal operation.3 Move the cable from Enclosure 1: left, port B→ Enclosure 2: left, port C.4 Connect a new cable between Enclosure 1: left, port B→ Enclosure 2: left, port A asshown in Figure 114 on page 181.5 Connect the A‐side cables to the controllers as shown in Figure 114 on page 181. Enclosure 2: left, port C→ Controller B: slot 3, port 3. Enclosure 1: left, port C→ Controller A, slot 3 port 1.6 In the Storage Center System Manager, select Storage Management→ System→Setup→ Configure Local Ports.7 Make sure that: Slot and slot ports are Up and the Purpose is set to back‐end. Target Count equals the number of added drives, demonstrating that the controllerrecognizes the new enclosure.Caution: Before adding an enclosure to an existing chain, make sure that your datais backed up. For maximum protection, add enclosures during a service outage.
