9-54 Upgrading Your ServerNoticeObserve the following notes on configuring a disk array: The installed hard disk drives must the same capacity and the same rotational speed. (Theminimum number of required disks depends on the configuration of RAID (RedundantArrays of Inexpensive [Independent] Disks).) Select/set a RAID level "RAID0", "RAID1", or "RAID5 (optional RAID controller only)"of disk array configuration.When installing a system in an internal hard disk drive, you should use "Express Setup" to performall the procedures for RAID configuration, OS installation, and then OS setup.Use Express Setup even when not installing a system. Start Express Setup, select [OS Selection] →[Others]. The installer automatically performs all the procedures for RAID configuration,maintenance partition setting, and then maintenance utility installation.When making the setup in manual mode, use the RAID configuration utility in the chip on the board.You can start the utility during execution of POST that automatically starts immediately after youturn on the server power switch. For details, see the online document in the NECEXPRESSBUILDER CD-ROM provided with the server. (The utility varies depending on the diskarray controller board.) For details on the data transfer rate, RAID, and array configuration, see themanual provided with the disk array controller board as well as the online document.Disk Expansion UnitA disk expansion unit is an exclusive device that can install up to 14 hard disk drives. (The numberof hard disk drives depends on the model.) The server containing a disk array controller board canconnect one or two of these devices. For details on the number of devices connected, see themanuals provided with the disk array controller and disk expansion unit.IMPORTANT: A disk expansion unit is provided with no hard diskdrives. You need to purchase hard disk drives separately.An optional cable may be required to connect with a disk expansion unit. Refer to the manualcoming with the disk expansion unit for details.After connecting the disk expansion unit, use the RAID configuration utility in the chip on the boardto set the disk expansion unit in a disk array configuration (RAID0, RAID1, or RAID5). (The utilityvaries depending on the board.) For details on settings and the setting methods, see the onlinedocument in the NEC EXPRESSBUILDER CD-ROM provided with the server or the manualprovided with the board.While a disk expansion unit is set in a disk array configuration, you can use the "Auto Rebuild"feature of the disk array controller to restore data if one of the hard disk drives installed in the diskexpansion unit fails. (Replace the failing hard disk drive while the power is on. (Hot swapping))
