Hitachi AMS 2100, Hardware Manual

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Hardware components
Hitachi AMS 2100/2300 Storage System Hardware Guide
Expansion unit power supply
As shown in Figure 4-20 , the expansion unit has two fully redundant power
supplies. If one power supply fails, the other one can supply sufficient power
and cooling to the array until the failed power supply is replaced.
Power supply status
As shown in Figure 4-22 , Each power supply has two LEDs on the panel near
the power receptacle. These LEDs indicate the operational status of the
power supply, and are described in Table 4-22 .
Figure 4-22: Expansion Unit Power Supply Components
Power receptacles
Each power supply contains a power receptacle that must be connected to
a working AC power source using the supplied AC power cable.
Table 4-22: Expansion Unit Power Supply Components
Item Description

Lock Lever (2 places)

Alarm LED (red) . This LED indicates that the power supply has failed. Although
the other power supply can supply sufficient power and cooling for the
expansion array, Hitachi Data Systems recommends that you replace the power
supply as soon as possible. See the
Hitachi AMS 2000 Family Storage
System Service Guide
for instructions.

Ready LED (green) . on each power supply blinks when the corresponding power
receptacle is connected to a working AC outlet, even if an AMS 2100/2300 array
is not turned on;
otherwise, the LED is OFF.
NOTE: Hitachi Data Systems recommends that each power supply in the
base unit be connected to a different AC source in the rack. If one source
fails, the other source continues to supply power to the other power supply.
This keeps the array running until power is restored to the failed source.