Replacing A Controller - IBM DS3500 Installation, User's, And Maintenance Manual

Replacing a controller

Use this procedure to replace a controller that has failed.
Before you replace a controller, perform the following prerequisite tasks:
Familiarize yourself with the steps to access the Storage Manager software. For details about installing
and using the Storage Manager software, refer to the IBM System Storage DS Storage Manager 10
Installation and Host Support Guide for your host operating system. The document is in the Documentation
folder on the IBM System Storage DS3500 Support DVD.
Important:
Obtain the following information about your storage subsystem and components:
v Determine whether you have a single-controller storage subsystem or a dual-controller storage
subsystem. For details, see "DS3500 storage subsystem overview" on page 1-2. See Figure 1-7 on page
1-11 for an illustration of a single-controller storage subsystem.
v See the topic "Checking the LEDs" on page 4-7 to understand how to check the status lights on the
LED panel.
Attention:
v Ensure that both power supplies are connected and powered-on and no amber LEDs are lit. If the
status of either of the power supplies is not Optimal, replace that power supply before you proceed
with the controller replacement procedure.
v If you are replacing a failed controller, you need to determine the capacity of the DIMM it contains.
There are two methods to determine the capacity of the DIMM in a failed controller:
– When you remove the failed controller you can look at the label on the DIMM to see if it is a 1 GB
or 2 GB DIMM.
– Use the Storage Manager Client. You can view the controller cache size either on the controller
properties screen (found in the Physical tab) or by viewing the storage subsystems profile. Refer to
the IBM System Storage DS Storage Manager 10 Installation and Host Support Guide for your host
operating system, for guidance on how to install the Storage Manager Client program, and to make
Management connections to the Storage subsystems after its installation. Also, refer to the
illustrations for reference.
To replace a controller in a storage subsystem, complete the following steps:
1. Read the safety information that begins on page "Safety" on page xi and "Best practices guidelines"
on page 1-7. See "Checking the LEDs" on page 4-7 for an illustration of the LED panel.
2. Use the Storage Manager software to print a storage subsystem profile. See Chapter 4, "Operating
the storage subsystem and storage enclosure," on page 4-1 for more information.
v In a dual-controller storage subsystem, move the logical drive ownership to the other controller.
v If the controller that you are replacing 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.
3. Locate the failed controller by checking the amber LEDs on the controllers in the storage subsystem.
4. If you have a single controller storage subsystem, skip this step and go to step 5 on page 5-6. For a
dual controller storage subsystem, follow these instructions:
v Is the OK TO REMOVE LED lit? If Yes, go to step 5 on page 5-6
v If No, another component might require attention before you can remove the controller. Run the
Storage Manager Recovery Guru to identify and correct any additional failures. To open Recovery
Chapter 5. Replacing components
5-5