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To preserve the optimal airflow, do not remove a failed power supply and fan unit
CRU from the DS4200 Express chassis until you are ready to replace it with a new
CRU.
Note: Unless problems prevent fan components from operating, the fan
Figure 3 shows power supply and fan unit components for the DS4200 Express.
Note: Although both power supply and fan units (left and right) are identical, they
Figure 3. Power supply and fan unit components for the DS4200 Express
Table 3. Description of Figure 3
Number
1
2
3
4
Figure 4 on page 11 shows a power supply and fan unit and the airflow through the
storage subsystem.
10
IBM System Storage DS4200 Express Storage Subsystem: Installation, User's and Maintenance Guide
components inside a powered off or failed power supply and fan unit draw
power from the surviving (currently operating) power supply and fan unit.
are seated in the DS4200 Express chassis in opposite orientations. If the
power supply and fan unit cannot fully be inserted in the power supply and
fan unit bay, flip it 180 degree and reinsert it.
1
3
4
Description
Power supply and fan unit A
Power supply and fan unit B
Power connector
Power switch
4
3
2
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