Raid Configuration - NEC HX4500 User Manual

RAID Configuration

One of the standard features of your system is the three channel SecuRAID 530
controller board, which gives your system the added security of fault tolerance.
If your system has RAID at the time you order it, the system is pre-cabled at the
factory. The RAID controller is installed in PCI slot P2 and is used to control
the hot-swap hard drive cages. Channel B of the dual Ultra2 wide SCSI-2
controller (Adaptec® AIC-7895) on the system I/O board is used to control up
to four peripherals (CD-ROM and tape drives) in the removable media drive
bays. A 3 1/2-inch diskette drive is installed in all systems and interfaces
separately to the system I/O board. Figure A-1 is a diagram of the SCSI cabling.
The narrow SCSI interface cable is connected to the SCSI connector on the
system I/O board (Figure A-1, D). This cable connects to the rear of the SCSI
removable media peripherals (if present). The last drive on the daisy chain cable
must have it's internal SCSI terminators installed (Figure A-1, A).
The Ultra2 wide SCSI interface cables are connected to the RAID board (Figure
A-1, Q). Termination for the hard disk drives is provided on the SCSI
distribution panel (Figure A-1, E).
The onboard narrow SCSI controller also includes a connector located at the
rear of the system for connecting external SCSI devices (Figure A-1, M). Three
important rules must be followed if you connect external narrow SCSI devices:
T
A maximum of seven narrow SCSI devices may be connected to the
onboard SCSI controller. For example if three SCSI devices in the system
cabinet are connected to the SCSI bus, only four external narrow SCSI
devices can be connected.
T
The maximum cable length for all narrow devices connected to the
controller is 1 meter (39 inches).
T
The last external narrow SCSI device must be terminated. Active
termination is recommended.
System Cabling A-3