Galaxy GHDX4 RAID iSCSI-SAS/SATA InstaHardware Reference Manual
72
Replacing a Controller Module
Overview
The controller module consists of the following components:
DIMM Module
: The DIMM module can be replaced when a DIMM
module fails or if a larger capacity DIMM is required.
CBM (optional for single controller models):
As part of the
CBM module, a BBU within is usually replaced every three (3)
years. If a BBU has lost its ability to hold electric charge, replace it
with a certified module.
WARNING!
1. The BBU within the chassis is not hot-swappable. BBU is contained in a
RAID controller canister. To replace a BBU, you must remove a RAID
controller. It is recommended to remove the BBU before replacing a DIMM
module because once a controller is removed from the chassis, BBU will
discharge to support the cache memory. If you replace a DIMM module
with supplied voltage, damage may occur.
2. Replace a DIMM
one (1) minute
after the BBU is removed. If necessary,
replace a DIMM
1 minute
after the BBU is removed.
Notes on Controller Maintenance
Re-using the DIMM module removed from a failed controller is not
recommended unless you have a similar RAID system to test its
integrity.
When replacing the controller module, you must remember that
the controller board is one of the most sensitive components in the
system. All previously stipulated safety precautions (see
Chapter
2
) must be strictly adhered to. Failure to adhere to these
precautions can result in permanent damage and timely delays.
Removing the Controller Module
To remove the controller module:
Step 1.
Prepare a clean, static-free work pad or container to place
the controller that will be removed from the chassis.
(Step 2 and Step 3 are for the single-controller systems. Skip
them if you are replacing a system with redundant controller
configuration
Step 2.
Make sure there is no data access to the subsystem to
avoid losing data
. Stop all I/O accesses to the
subsystem and make sure all cached writes have been
distributed to disk drives.
This function is accessed from
Main Menu
->
System Functions
.
