DC power supply and fan units
The DS4700 Express Storage Subsystem (models 70S, 70T, 72S, and 72T) has
two removable dc power supply and fan units. Each dc power supply and fan unit
contains one dc power supply and two fans. The four fans pull air through the drive
from front to back across the drives.
The fans provide redundant cooling, which means that if one of the fans in either
fan housing fails, the remaining fans continue to provide sufficient cooling to
operate the storage subsystem. The power supplies provide power to the internal
components. If one power supply is turned off or malfunctions, the other power
supply maintains power to the storage subsystem. To preserve the optimal airflow,
do not remove a failed dc power supply and fan unit CRU from the DS4700
Express chassis until you are ready to replace it with a new CRU.
Figure 6 shows a power supply and fan unit and the airflow through the storage
subsystem.
Figure 7 on page 15 shows a side view of the dc power supply and fan units (1).
Note: Although both dc power supply and fan units (left and right) are identical,
they are seated in the DS4700 Express chassis in opposite orientations. If
the dc power supply and fan unit cannot fully be inserted in the dc power
supply and fan unit bay, flip it 180 degree and reinsert it.
Lever
Latch
Figure 6. Power supply and fan unit and airflow
14 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide
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