IBM DS3200 Storage Subsystem manual Power supply and fans, Rear view, single-controller model

Figure 5 shows a single-controller DS3200 without the optional SAS host port adapter installed.

Figure 6 shows a dual-controller DS3200 with the optional SAS host port adapter

Raid controller A

Filler panel

Hot-swap power supplies

Figure 5. Rear view, single-controller model

installed in each controller.

SAS host adapter RAID controller B

Figure 6. Rear view, dual-controller model (shown with optional SAS host port adapters installed)

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 DS3200 chassis until you are ready to replace it with a new power-supply unit.

Figure 7 shows the power-supply unit components for the DS3200.

Power	Power	Power	Power
switch	connector	switch	connector

Figure 7. Power-supply unit components for DS3200

10System Storage DS3200 Storage Subsystem: Installation, User’s, and Maintenance Guide