User Guide156www.nec-computers.comInstalling or Removing a RAID Controller BoardNote: The server contains onboard RAID controller. Seethe online document in NEC EXPRESSBUILDER CD-ROM forconfiguring RAID using the onboard RAID controller.The RAID controller board is an optional PCI board developed to improve datareliability.Installing the disk array controller board allows you to use hard disk drives in thedevice bays of the server and those in the optional additional disk unit in the disk arrayconfiguration.The server can include one of the following optional RAID controller:■ MegaRAID SCSI 320-1■ MegaRAID SCSI 320-2■ LSILogic MegaRAID SAS 8480E■ LSILogic MegaRAID SAS 8408ESee the manual that comes with your RAID controller for details.Please note the following when installing and configuring a disk array:■ Disk array controller boards are easily affected by static electricity. Handle the diskarray controller board only after making body contact with the metallic framesection of the server chassis in order to discharge the static electricity from yourbody. Also, never make contact with terminals and components on the disk arraycontroller board using your bare hands.■ To change the disk array configuration or the RAID level, the hard disks must beinitialized. If important data is saved on the hard disks used to constitute a diskarray, first back up the data on the other hard disks and then install the boards andconfigure the disk array.■ At least two hard disk drives are required to configure a disk array.■ Hard disks used in the disk array configuration should have the same diskrevolution rate and capacity.Table 22: Functions of a Disk Array ControllerFunction DescriptionLevel Support RAID levels RAID0, RAID1, RAID5, RAID10 and RAID50.Hot swap Allows a hard disk to be replaced while the system is runningdepending on RAID level and system configuration.Auto rebuild After the defective hard disk is replaced with a new one, the datasaved in the defective hard disk is automatically recovered from thedata saved in the remaining hard disks depending on RAID level.Expand capacity The addition of a hard disk without system interruption canautomatically expand the area in which disk arrays are available, andthe logical drive capacity.
