AC power supply and fan units
The DS5020 storage subsystem has two removable ac power supply and fan units.
Each power supply and fan unit contains one 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 by converting incoming ac voltage to dc voltage. If one power supply is
turned off or malfunctions, the other power supply maintains electrical power to the
storage subsystem. To preserve the optimal airflow, do not remove a failed power
supply and fan unit CRU from the DS5020 chassis until you are ready to replace it
with a new CRU.
Figure 5 shows power supply and fan unit components for the DS5020.
Notes:
1. Your DS5020 hardware might differ slightly from the following illustration.
2. Although both power supply and fan units (left and right) are identical, they are
seated in the DS5020 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.
Figure 6 on page 16 shows a power supply and fan unit and the airflow through the
storage subsystem.
Figure 5. Power supply and fan unit components for the DS5020
Chapter 1. Introduction 15
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