NEC HX4500 manual RAID Configuration, System Cabling A-3

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:

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.

The maximum cable length for all narrow devices connected to the

Tcontroller is 1 meter (39 inches).

The last external narrow SCSI device must be terminated. Active termination is recommended.

System Cabling A-3