NEC HX4000, User Manual

Page: 19 / 210

2-3
Features
■
Chassis can hold 18 drives: 12 hot-swap bays for
3 1/2-inch ultra wide SCSI-3 hard drives; four
5 1/4-inch half-height bays for removable media
drives with a CD-ROM reader already installed in
one bay; and two 3 1/2-inch half-height bays with a
diskette drive already installed in one bay.
■
Chassis supports up to four power supplies.
Configuration Constraints
Power supplies are hot-swappable and are easily
removed and installed. The third or fourth power
supply provides redundant power when located in the
redundant power supply slot in the power cage (see
Figure 2-9, Power Supply Module Features). The
redundant power supply provides redundant power so
that if one of the three power supplies fail, the system
will continue to operate and the failed power supply
can be hot swapped. That is, the failed power supply is
removed and replaced without turning power off.
The system has four 5 1/4-inch half-height bays
accessible from the front. These bays are convenient for
diskette, tape, and CD-ROM drives (removable media).
Because of the EMI generated by hard drives, the
increased susceptibility to ESD, and cooling
requirements, hard drives should not be installed in
the 5 1/4-inch half-height bays.