user manual

EonStor A08U/A12U-G2421 Installation and Hardware Reference Manual
Figure 1-9: Rear View – A12U-G2421 Subsystem
Figure 1-10: Rear View – A08U-G2421 Subsystem
The rear panels shown above are designed to accommodate the following
components:
• RAID controller module: The controller module contains a controller main
board and a pre-installed DDR DIMM module.
• Power Supply Unit (PSU): The PSU is used to provide power to the
subsystem.
• BBU module: A BBU comes as an optional module which provides the
protective implementation to cached data; and, unless deselected when
purchasing the subsystems, is installed into the module slot located at the
upper left corner of the controller module.
• Cooling fan module: The redundant cooling fan module is used to ventilate
the subsystem and to reduce the temperature within the subsystem. The 12-bay
model has an additional cooling module installed in the bottom module bay.
NOTE:
Each of the power supplies on the sides of the enclosure houses one cooling fan
module in a retrievable canister. When a power supply is removed, the cooling
module is also removed. Therefore, replace the power supply unit as fast as possible
whenever it becomes necessary. Cooling fan modules can be independently removed
from the chassis without affecting PSU operation.
Product Overview
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