NEC Express5800/120Lh User's Guide download pdf (Page 246)

9-34 Upgrading Your Server

RAID Controller Board

The RAID controller board is an optional PCI board developed to improve data reliability. The

board can be installed to use the hard disks in the 3.5-inch disk bay of the server and those in

additional disk unit in the disk array configuration.

The server can include the following optional RAID controller.

 SCSI disk array controller (N8103-80F, single-channel)

 SCSI disk array controller (N8103-81F, dual-channel)

 SCSI disk array controller (N8103-86F, 0 channel)

See the manual that comes with your RAID controller for detail.

Function of disk

array controller

Description

Level Refer to the manual that comes with your optional RAID controller for the

supported RAID level.

Hot plug Allows a device such as a hard disk to be replaced under the system

operation status.

Auto rebuild After the defected hard disk is replaced with a new one, the data saved in the

defected hard disk is automatically recovered from the data saved in the

remaining hard disks.

Expand capacity

The addition of a hard disk without system interruption can automatically

expand the area in which disk arrays are available.

Cautions

Note the following on the configuration of a disk array.

 The disk array controller board is easily affected by static electricity. Handle the disk

array controller board after making your body contact with a metallic frame section of the

server to discharge the static electricity on your body. Do not make bare hands contact

with terminals and components on the disk array controller board. In addition, do not

put the disk array controller board on a desk directly. See "Static Precautions" for details

of the static electricity.

 To change the disk array configuration or the RAID, the hard disks must be initialized.

If important data is saved in the hard disks used to constitute a disk array, first back up the

data in other hard disks before installing boards and configuring the disk array.

 More than one hard disk is required to configure a disk array.

 Hard disks used in the disk array configuration should have the same disk revolution rate

and capacity in packs.

 See "PCI Board" in this Chapter for the slot in which a board can be installed.

 Up to four disk array controller boards can be installed in the server.

 Several RAID (Redundant Arrays of Inexpensive [Independent] Disks) levels can be set

for the disk array configuration in the server in which disk array controller boards are

installed. Refer to the online document saved in "NEC EXPRESSBUILDER" CD-ROM

coming with the server or the documentation coming with the disk array controller for

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NEC Express5800/120Lh User's Guide Page 246

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