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EonStor A08U/A12U-G2421 Installation and Hardware Reference Manual
• Qualified engineers who are familiar with the subsystem should be the only ones
who make component replacements. If you are not familiar with the subsystems
and not familiar with RAID subsystem maintenance in general, it is strongly
advised that you refer subsystem maintenance to a suitably qualified
maintenance engineer.
• Normalized airflow is directly dependent upon the presence of all subsystem
components. Even if a subsystem component fails, it should not be removed
from the subsystem until a replacement is readily at hand and can be quickly
installed. Removing a subsystem component without a replacement can lead to
permanent subsystem damage.
• When replacing any hot-swappable component, caution should be taken to
ensure that the components are handled in an appropriate manner. Rough or
improper handling of components can lead to irreparable damage.
• When removing a controller module from the subsystem, ensure that the power
has been turned off and that all precautionary measures, without exception, are
adhered to. The controller board contains very sensitive components and can be
easily damaged.
WARNING!
When inserting a removable module, take heed that DO NOT USE
EXCESSIVE FORCE!
Forcing or slamming a module can damage the pins
on the module connectors either on the module itself or on the backplane. Gently
push the module until it reaches the end of module slot. Feel the contact
resistance and use slightly more force to ensure the module connectors are
correctly mated. If the module comes with extraction levers or retention screws,
use them to secure the module.
5.2 Replacing Controller Module Components
5.2.1 Overview
The controller module should never be removed unless the following replaceable
components need to be accessed:
• Cache memory DIMM module: If a larger capacity DIMM module is required.
• Controller module itself: If the controller module in a single-controller
model fails, it is necessary to power down the
subsystem and replace the controller.
If a DIMM module or RAID controller fails, contact your vendor immediately for a
replacement. To replace any of these components, the controller module must first be
removed from the subsystem.
5-2
Replacing Controller Module Components