IBM DS3500 Installation, User & Maintenance Manual page 117

Attention:
v If you are replacing a failed controller with a replacement controller from IBM
Service, you will transfer the controller battery to the replacement controller. The
replacement controller contains a 1024 MB DIMM; if the capacity of the DIMM in
the failed controller is larger than 1024 MB, you will also transfer that DIMM to
the replacement controller. Transfer the DIMM and battery exactly as described in
this procedure; failure to remove and insert these items in the correct sequence
can damage the DIMM.
v In a single-controller storage subsystem, shut down the storage subsystem
before you remove the controller.
1. Read the safety information that begins on page xiii and "Best practices
guidelines" on page 5.
2. In a single-controller storage subsystem, shut down the storage subsystem
(see "Turning off the storage subsystem" on page 81 for the correct sequence
of steps); then, continue with step 4.
3. Use the DS Storage Manager software to print a storage subsystem profile.
Move logical drive ownership to the other controller. If the controller that you
are replacing has failed but is still operating, move the failed controller to the
Offline state.
Attention: Never remove a controller unless the OK to remove LED is lit.
Doing so can result in a loss of data.
4. Locate the failed controller by checking the amber LEDs on the controllers in
the storage subsystem.
5. Is the OK to remove LED lit?
v Yes: Go to step 6.
v No: Another component might require attention before you can remove the
controller. Use the Recovery Guru in the Subsystem Management window to
identify and correct any additional failures. If there are none, proceed with
step 6 to replace the controller.
Attention: Static electricity can damage the storage subsystem and other
electronic devices. To avoid damage, keep static-sensitive devices in their
static-protective packages until you are ready to install them.
6. Unpack the new controller. Save all packing materials in case you have to
return the new controller.
7. Determine whether the replacement controller will be controller A or controller
B (controller A is installed in the left controller bay; controller B is installed in
the right controller bay), and then apply the controller labels for host ports and
drive expansion ports to the replacement controller. The controller labels and
instructions are included with the replacement controller. Make sure that the
labels are aligned correctly and do not cover any connectors or LEDs.
Attention: Handle and install cables correctly to avoid degraded
performance or loss of communication with devices. See "Cabling the DS3500
storage subsystem" on page 23 for more information.
8. Disconnect all attached interface cables from the failed controller. Be sure to
label each cable so that you can reconnect it correctly to the new controller.
9. If the controller has failed in a single-controller storage subsystem, turn off the
power immediately (see "Performing an emergency shutdown" on page 83 for
instructions).
10. Remove the controller from the chassis.
Chapter 5. Replacing components
97