RA8000 and ESA12000 Storage Subsystems
1–24
387404-001
EK–SMCPR–UG. A01
1.6
Power Supply SBBs
CAUTION
The subsystem requires power supply SBBs rated for at
least 180 W such as the DS-BA35X-HH. You cannot use
lower rated supplies, such as the 131 W (DS-BA35X-HA),
the 145 W (DS-BA35X-HD), or the 150 W (DS-BA35X-HF).
The 180 W shelf power supply SBB (Figure 1-14) converts the ac voltage from the power
controller to +5 V dc and +12 V dc for distribution throughout the storage subsystem. The
maximum capacity of the storage subsystem is eight power supplies.
Figure 1–14 Typical Shelf Power Supply SBB
Power
Status LED
(Green)
Power Supply
Status LED
(Green)
SHR-1151
The 4 + 1 standard configuration provides five power supplies connected to power bus A
(the black power cords). As long as any four of these supplies are operational, the
subsystem is operational. The failure of a second supply places the subsystem array
controller in a reset state. This precludes further data processing and prevents the
corruption or loss of the stored data.
With the 4 + 4 full redundant power option, the subsystem can survive multiple power
supply faults. To fully realize the benefits of the 4 + 4 configuration, connect the ac
power entry controllers to different ac distribution circuits on the same site distribution
panel. The four subsystem power supply SBBs on the left end of the shelf are connected
to ac power entry controller A. The four on the right end of the shelf are connected to ac
power entry controller B.
