Disk Array Controller Board - NEC Express5800/120Rd-2 Service Manual

7-46 Disassembly and Reassembly

Disk Array Controller Board

The disk array controller board is an optional PCI board provided to improve data reliability.
Installing the disk array controller board allows you to use hard disks in the device bays of the
server and those in the optional expansion disk cabinet in the disk array configuration.
IMPORTANT:
The disk array controller board is extremely sensitive to static
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electricity. Make sure to touch the metal frame of the Server to
discharge static electricity from your body before handling the disk
array controller board. Do not touch the disk array controller board
terminals or on-board parts by a bare hand or place the disk array
controller board directly on the desk. For static notes, see the section
"Anti-static Measures" described earlier.
Making hard disks in the disk array configuration or changing the
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RAID level initializes hard disks. If the hard disk to be configured in
the array has your valuable data stored, make sure to make a backup
copy of the data in another hard disk before installing the disk array
controller board and configuring the array.
The disk array configuration requires at least two hard disks.
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Use hard disks of the same capacity and performance (e.g., revolution)
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for each pack to configure them in the array.
If using Netware, you cannot use a disk array controller of the full-
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height type in slot 1B, 2B, or 3B and a disk array controller of the
low-profile type in slot 1C, 2C, or 3C at the same time. To use more
than one disk array controller, install them in only either slots 1B, 2B,
and 3B or slots 1C, 2C, and 3C. (Up to 3 disk array controller boards
can be installed.)
NOTES:
Before installing a disk array controller board, start the SETUP utility,
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select [Advanced] → [PCI Configuration], and confirm that [Enabled]
is set for the parameter [PCI Slot xx ROM] (xx: PCI slot number).
A disk array configuration of RAID1, RAID5, or RAID0+1 increases
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disk reliability. However, the actually available capacity becomes
smaller than the total hard disk capacity in the disk array
configuration.