NEC 140He User Manual page 280

9-22
RAID Controller Considerations
Note the following on the configuration of a disk array by using the on-board or optional disk array controller.
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.
At least two hard disk drives are required to configure a disk array.
Hard disk drives used in the disk array configuration should have the same disk revolution rate and capacity in
packs.
See the table on 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.
Several 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
rate, and array configuration.
For an optional disk array controller, refer to the documentation coming with the disk array controller for
details.
The 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
Configuration" in the Advanced menu of the BIOS SETUP utility. For other slots, set the parameter to
"Disabled". ("Enabled" is factory-set.) If two or more disk array controllers are installed, set only the slot
containing the board to boot-up to "Enabled". Do not set "Option ROM Scan" for embedded SCSI to
"Disabled".
Replacement of I/O board or optional disk array controller board
Back up the disk array configuration information in the disk array controller board to a floppy disk and restore
it to the replaced disk array controller board. Use the configuration utility for backup and restoration. See
"Disk Array Configuration" described later or refer to the manual that comes with the disk array controller for
details. If a disk array 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 disk array controller
board to which the system disk is connected in the PCI slot having the highest boot priority.
Boot priority: PCI#3 → PCI#4 → PCI#5 → PCI#8 → PCI#9 → PCI#6 → PCI#7 → PCI#1 → PCI#2
For example, if four disk array controller boards are installed in PCI slots #6 to #9, the system disk should be
connected to the board installed in PCI slot #8.
The maximum total capacity of the hard disk drives that are configured as a logical drive or a pack is 2 TB
(terabyte).
The maximum logical disk capacity for installing Microsoft Windows 2000 operating system or Linux
operating system is 1 TB.