IBM System Storage DS3300, Installation, User'S, And Maintenance Manual

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Figure 6 shows a dual-controller DS3300.
Power supply and fans
The storage subsystem has two removable power-supply units. Each power-supply
unit contains one power supply and two fans. The four fans pull air through the
drives 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 unit from the DS3300 chassis until you are ready to replace it with a
new power-supply unit.
Figure 7 shows the power-supply unit components for the DS3300.
RAID controller B RAID controller A
Figure 6. Rear view, dual-controller model
Power
connector Power
switch Power
connector Power
switch
Figure 7. Power-supply unit components for DS3300
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System Storage DS3300 Storage Subsystem: Installation, User’s, and Maintenance Guide