NEC Express 5800 120Eg, User Manual

Page: 149 / 292

120Eg User Guide - Upgrading Your System
4 - 47
Installing or Removing a 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 (SecuRAID 114 one channel SCSI RAID controller)
■
SATA disk array controller (FastTrak S150-SX4 S-ATA RAID controller)
See the manual that comes with your RAID controller for detail.
The functions of a disk array controller are described in "Table 4 - 1: Functions of a
Disk Array Controller" on page 4-47.
Table 4 - 1: Functions of a Disk Array Controller
Please note the following when installing and configuring a disk array:
■
Disk array controller boards are easily affected by static electricity. Handle the disk
array controller board only after making body contact with the metallic frame
section of the server chassis in order to discharge the static electricity from your
body. Also, never make contact with terminals and components on the disk array
controller board using your bare hands.
■
To change the disk array configuration or the RAID level, the hard disks must be
initialized. If important data is saved on the hard disks used to constitute a disk
array, first back up the data on the other hard disks and then install the boards and
configure 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.
■
Up to two disk array controller boards can be installed in your server.
■
Several RAID (Redundant Arrays of Independent Disks) levels can be set for the
newly installed disk array controller boards. For details of the available RAID
types, data transfer rate, and array configurations refer to the online documentation
on the
NEC EXPRESSBUILDER CD-ROM that comes with your system or the
vendor documentation that comes with the disk array controller.
Function Description
Level Support RAID levels RAID0, RAID1, RAID5, and RAID0+1.
Hot plug Allows a hard disk to be replaced while the system is running depending on RAID
level and system configuration.
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 depending on RAID level.
Expand capacity The addition of a hard disk without system interruption can automatically
expand the area in which disk arrays are available.