76 CHAPTER 2: INSTALLING SYSTEM HARDWARE COMPONENTSInstalling a SecondDisk for DiskMirroringDisk mirroring provides the ability to run a second disk in parallel withthe first. For more detailed information about disk mirroring, see “DiskMirroring” in the NBX Administrator’s Guide.Disk Mirroring is an optional feature. If you do not install a second diskwhen you first install your Network Telephone System, you can purchasean upgrade kit at a later time. If you are not installing a second disk withyour Network Telephone System, you can skip this section and proceed to“Powering Your SuperStack 3 NBX System” on page 77.This section describes how to install your second disk when you aresetting up your NBX system. While the primary disk is already mounted inyour Network Call Processor chassis, the second disk (if you purchasedone) is packaged separately for you to install.CAUTION: To avoid damage to electronic circuits, always wear ananti-static grounding strap when handling the disk drive or NBX systemcomponents. When you ground the strap, do not ground it to anNBX chassis because the chassis is not grounded until you install it in aproperly grounded setting.To install an additional disk drive for disk mirroring:1 Install the key code for your disk mirroring license.2 Shut down system software.3 Turn off power to your system. If your SuperStack 3 NBX Call Processorhas redundant power supplies you must disconnect both supplies.4 Remove the disk drive tray on your Network Call Processor.5 Unpack the second disk drive and install it in slot number 2 of the disktray.6 Connect the ribbon cable correctly.7 Re-insert the disk drive tray.After you add power to the system, disk synchronization beginsautomatically and finishes in approximately 60 to 90 minutes, dependingon the amount of information on disk 1 that must be mirrored on disk 2.
