Chapter 5: Subsystem Maintenance
Replacing Controller Module Components
5-3
can be removed and used on the new controller module if they are
functioning normally.
When replacing the controller module, always remember that the
controller board is one of the most sensitive components in the
subsystem. All previously stipulated safety precautions (see
Section 2.3
) must be strictly adhered to. Failure to adhere to these
precautions can result in permanent damage to the controller board,
resulting in lengthy delays.
WARNING!
1.
The BBU is hot-swappable and can be independently
swapped from the controller. However, the BBU is installed
in the controller module metal case, when the controller
module is removed, the BBU is also removed.
2.
It is recommended to remove BBU before handling the
controller BECAUSE 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 might occur.
5.2.2 Removing the Controller Module
To remove the controller module:
Step 1.
Prepare a clean, static-free work pad on which to place the
controller that will be removed from the chassis.
Step 2.
Make sure there is no data access
to the subsystem
to avoid losing
any data. Stop all I/O accesses to the subsystem and make sure all
cached writes have been distributed to disk drives.
Step 3.
Power off the subsystem.
Be sure to flush all cached data before
powering off the subsystem. Power off the subsystem using both
power switches on the PSU modules.
Step 4.
Remove the BBU module if one has been installed. Loosen the
BBU module’s spring screws and then retrieve it from the chassis.
(See
Section
5.4
)
