NEC Express5800 140Rd-4 User Manual page 269

RAID Controller Considerations
N ote the following about the configuration of a disk a
To change the disk array configuration or the RAID, the hard disk drives must be initialised. If important data is
saved in the hard disk drives used to constitute a disk array, first back up the data in other hard disk drives before
installing boards and configuring the disk array.
Mo re than one hard disk drive is required to configure a disk array.
Har d disk drives used in the disk array configuration should have the
See the table on the next page for the slot in which an optional board can be installed.
Up to four disk array controller boards can be installed in the server.
S everal RAID (Redundant Arrays of Inexpensive [Independent] Disks) levels can be set for the disk array
configuration in the server. See "Disk Array Configuration" described later for available RAIDs, data transfer
and array configuration.
F or optional disk array controller, refer to the documentation coming with the disk array controller for details.
T he available capacity of the hard disk drives in the disk array configuration is lower than the total capacity of the
hard disk drives configuring the disk array while the disk reliability is improved (for RAID 1, 5, 10, or 50).
Set "Option ROM Scan," a parameter of the slot in which a hard disk is installed, to "Enabled" in "PCI
Con figuration" on the Advanced menu of the BIOS utility SETUP. For other slots, set the parameter to "Disabled".
(The "Enabled" is factory-set.) If two or more disk array controllers are installed, set only the slot containing the
bo ard to boot-up to "Enabled". Do not set "Option ROM Scan" for embedded SCSI to "Disabled".
Re placement of I/O board or optional disk array controller board
B ack up the disk array configuration information in the disk array controller board to the floppy disk and restore it to
the replaced disk array controller board. Use the configuration utility for the backup and restoration. See "Disk Array
Con figuration" described later or refer to the manual that comes with the disk array controller for details. If a disk
arra y controller is replaced, create the configuration information newly by using the proper utility.
When more than one disk array controller board are installed in the server, install the
w hich the system disk is connected in the PCI slot having the highest boot priority.
t priority: PCI#3 → PCI#4 → PCI#5 → PCI#8 → PCI#9 → PCI#6 → PCI#7 → PCI#1 → PCI#2
Boo
For example, if four disk array controller boards are installed in PCI slots #6 to #9, the system disk should be
con nected to the board installed in PCI slot #8.
rray by using the on-board or optional disk array controller.
same disk revolution rate and capacity.
9-21
rate,
disk array controller board to