Replacing A Failed Controller - IBM Netfinity FASt T500 User Reference

• You can hot swap or replace a failed controller while the controller unit is in operation
as long as the failed controller is one of a redundant pair (two controllers attached to
the same host) and has a "passive" or "offline" status in the storage-management
software.
• If cache mirroring is enabled in redundant controllers and one controller fails, the
second controller assumes processing functions without data loss. However, some or
all data might be lost if cache mirroring is disabled and a failure occurs before data is
written from cache memory to disk.
• If you replace the controller CRU and still experience problems, the controller unit
might have defective components or connections. Check the storage-management
software for indications of other component failures.
• If a controller CRU fails, the fault light on the affected controller glows. For more
information about indicator lights, see
• Firmware between the two controllers is automatically synchronized when you replace
a controller.

Replacing a failed controller

When instructed by the storage-management software, replace a controller CRU using the
following procedure.
Attention: When you handle electrostatic discharge (ESD) sensitive devices, take
precautions to avoid damage from static electricity. For details about
handling ESD-sensitive devices, refer to the following Web site and use a
search term of ESD: http://www.ibm.com/
1 Remove the controller unit bezel, as shown in
Attention: Removing a controller that is operating normally (not failed) can result in
data loss. Only remove a controller that:
• Has a fault indicator light that is glowing
• Is marked as "Failed" (offline) through the storage-management software.
2 Using Figure 16 on page 31
a Squeeze the two center tabs and open the handles.
b Remove the controller.
c Close the handles and snap into place.
30 IBM Netfinity FAStT500 RAID Controller Enclosure Unit User's Reference
"Checking the indicator lights" on page
Figure 6 on page
as a guide, remove the controller that has failed.
15.
11.