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5.2. Replacing Controller Module Components
5.2.1 Overview
The controller module consists of the following components:
DIMM Module
BBU
WARNING!
1. The BBU is hot-swappable and can be independently swapped from the
2. It is recommended to remove the BBU before handling the controller because
5.2.2 Notes on Controller Module Maintenance
The controller module contains a DIMM module for cache buffer. When replacing the
controller module, the DIMM module can be removed and used on the replacement
controller if they are known to be good.
When replacing the controller module, you must remember that the controller board is
one of the most sensitive components in the Galaxy RAID subsystem. All previously
stipulated safety precautions (see Chapter 2) must be strictly adhered to. Failure to
adhere to these precautions can result in permanent damage, resulting in timely delays.
For your own safety and that of the subsystem, make sure that no power is being
supplied to the system prior to replacing the controller module.
5.2.3 Removing the Controller Module
To remove the controller module:
Replacing Controller Module Components
Chapter 5: Subsystem Maintenance and Upgrading
The DIMM module can be replaced when a DIMM module
fails or if a larger capacity DIMM is required.
If the BBU has lost its ability to hold electric charge, replace it
with a certified module. With the new BBU that comes with
ASIC400 models, an EEPROM is implemented and that
system administrators will be notified by system events when
the approximate one-year life expectancy is reached.
controller. However, the BBU is installed into a metal bracket on the
controller module. When the controller is removed, the BBU is also removed.
once a controller is removed from chassis, BBU will discharge to support the
cache memory. If you replace a DIMM module with supplied voltage, damage
may occur.
5-3
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