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, see the IBM System Storage DS Storage Manager Version 10 Installation and Host Support Guide (for DS Storage Manager V10.77 or earlier) or the IBM System Storage DS Storage
Release levers
a. Ensure that the release levers on the controller are in the open position.
b. Slide the controller into the bay until it stops.
c. Push the release levers to the closed position.
Figure 90. Installing a controller
Manager Version 10.8 Installation and Host Support Guide (for DS Storage Manager V10.83 or later) for the applicable 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 2. See Figure 7 on page 13 for an illustration of a
single-controller storage subsystem.
v See the topic “Checking the LEDs” on page 88 to understand how to check the status lights on the LED panel.
v Check the MAC addresses of the host ports after replacing the controller and/or the host port interface adapter. If you need to change the MAC address, update the servers or switches in the configuration.
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 ix and “Best practices guidelines” on page 8. See “Checking the LEDs” on page 88 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 81 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. For a dual controller storage subsystem, follow these instructions:
v Is the OK TO REMOVE LED lit? If Yes, go to step 5
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 Guru, click the Support tabin the Subsystem Management window. See “Troubleshooting the storage subsystem” on page 87 topic for information about using the Recovery Guru.
If there are no additional failures, proceed with step 5 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.
5. Unpack the new controller. Save all packing materials in case you have to return the new controller.
6. 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. In a single-controller storage subsystem, the new controller will go into the same slot, as the old one. The controller labels and instructions are included with the replacement controller. Ensure 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 31 for more information.
7. Disconnect all attached interface cables from the failed controller. Ensure that you label each cable so that you can reconnect it correctly to the new
controller.
8. In a single-controller storage subsystem, shut down the storage subsystem (see
“Turning off the storage subsystem” on page 95 for the correct sequence of steps). See Figure 7 on page 13 for an example of a single-controller Storage Subsystem.
9. Remove the controller from the chassis.
Release levers
Figure 91. Removing and replacing a controller
a. Open the two release levers as shown in the illustration. The controller moves out of the bay approximately 0.6 cm (0.25 inch).
b. Pull the controller out of the bay.
DANGER
Electrical voltage and current from power cables are hazardous. To avoid a shock hazard, always place electrical equipment on dry, static-free level surfaces. Never turn on any electrical equipment when there is evidence of fire, water, or structural damage.
c. Place the controller on a dry, static-free level surface.
Attention: The DS3500 replacement controller ships with a temporary filler.
Place the temporary filler in the controller chassis bay after the failed controller is removed, to maintain proper airflow and cooling.
10. Remove the cover (see “Removing and installing a cover” on page 107).
11. Remove the battery from the failed controller.
a. Loosen the blue captive fastener till you can move the battery in the direction that is indicated by the arrow.
b. Slide the battery unit out of the controller in the direction that is indicated by the arrow.
c. Set the battery aside.
12. Remove the cache backup flash memory device from the controller and install in the new controller.
a. Release the flash memory device by gently pushing the memory farther into the slot. The slot will release the flash memory device and push the flash memory device out of the slot.
b. Carefully pull the flash memory device free from the slot.
c. Install the cache battery backup flash memory device into the empty slot location of the new controller by pressing the flash memory device into the slot until the flash memory is fully seated.
The following figure shows the location of the cache backup flash memory device on the controller board.
Battery connector
Captive fastener Memory cache battery
Figure 92. Removing the battery unit from the controller
13. If the capacity of the DIMM in the controller that you removed is more than 1024 MB, complete the following steps to transfer the DIMM to the new controller:
a. Remove the 1024 MB DIMM from the new controller and set it aside (see
“Replacing the memory cache DIMM” on page 150 for instructions).
b. Insert the DIMM into the new controller (see “Installing the DIMM” on page 152 for instructions).
14. Install the battery from step 11 on page 112 into the new controller:
a. Slide the battery into the controller until the connector pins of the battery are firmly affixed to the battery connector of the controller.
b. Turn the captive fastener clockwise to secure the battery in place.
15. Install the cover (see “Removing and installing a cover” on page 107) Attention: Remove the temporary filler before you install the replacement controller.
16. Install the new controller.
a. Ensure that the release levers on the controller are in the OPEN position.
b. Slide the controller into the bay until it stops.
c. Push the release levers to the CLOSED position.
17. Connect the cables that you disconnected in step 7 on page 111.
18. (Single-controller only) Turn on the storage subsystem (see “Turning on the storage subsystem” on page 82).
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Cache backup flash memory device
Figure 93. Cache backup flash memory device
19. Wait up to 5 minutes for the Storage Manager software to detect the new controller.
20. Complete any remaining RECOVERY GURU procedures for controller replacement.
21. Check the LEDs on the new controller to ensure that the controller is fully operational.
22. Use the Subsystem Management window to check the status of all components in the storage subsystem.
v If the new controller is online and the Subsystem Management window indicates normal operation, go to step 25.
v If the new controller is online and the Subsystem Management window indicates a problem status, go to “Troubleshooting the storage subsystem”
on page 87.
v If the new controller is offline, continue with step 23.
23. If the newly inserted controller is in an offline state, see the Storage Manager online help for instructions on bringing the controller online. If necessary, open the Subsystem Management window and place the controller online;
select the offline controller and click Advanced > Recovery > Place controller online.
24. Verify the state of the LEDs on the newly inserted controller. See “Controller LEDs” on page 90. You can also use the Subsystem Management window to identify any new faults. Do any storage subsystems have a fault (Needs Attention) status?
v Yes:Click Recovery Guru in the Subsystem Management window toolbar, and complete the recovery procedure. If the problem remains, contact your IBM technical-support representative.
v No:Go to step 25.
25. Use the Storage Manager software to print a new storage subsystem profile.
26. Check the WWIDs or the MAC addresses of the host ports after replacing the controller and/or the host port interface adapter. If you need to change any WWID or MAC address, update the servers or switches in the configuration.
27. You may have to reboot your system to remove LUNs information associated with the WWID of the controller you removed.