Replacing a control enclosure midplane

A control enclosure midplane assembly must be replaced only by a trained service provider.

When working on or around the system, observe the following precautions:

Electrical voltage and current from power, telephone, and communication cables are hazardous. To avoid a shock hazard:

  • If Lenovo supplied a power cord(s), connect power to this unit only with the Lenovo provided power cord. Do not use the Lenovo provided power cord for any other product.
  • Do not open or service any power supply assembly.
  • Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration of this product during an electrical storm.
  • The product might be equipped with multiple power cords. To remove all hazardous voltages, disconnect all power cords.
  • Connect all power cords to a properly wired and grounded electrical outlet. Ensure that the outlet supplies proper voltage and phase rotation according to the system rating plate.
  • Connect any equipment that will be attached to this product to properly wired outlets.
  • When possible, use one hand only to connect or disconnect signal cables.
  • Never turn on any equipment when there is evidence of fire, water, or structural damage.
  • Disconnect the attached power cords, telecommunications systems, networks, and modems before you open the device covers, unless instructed otherwise in the installation and configuration procedures.
  • Connect and disconnect cables as described in the following procedures when installing, moving, or opening covers on this product or attached devices.
    To disconnect:
    1. Turn off everything (unless instructed otherwise).
    2. Remove the power cords from the outlets.
    3. Remove the signal cables from the connectors.
    4. Remove all cables from the devices.
    To connect:
    1. Turn off everything (unless instructed otherwise).
    2. Attach all cables to the devices.
    3. Attach the signal cables to the connectors.
    4. Attach the power cords to the outlets.
    5. Turn on the devices.
  • Sharp edges, corners and joints might be present in and around the system. Use care when handling equipment to avoid cuts, scrapes and pinching. (D005)
Attention: The control enclosure midplane assembly must be replaced only by a trained service provider. Complete this procedure only if instructed to do so by a service action or the IBM support center. If you have a single control enclosure, this procedure requires that you shut down your system to replace the control enclosure midplane assembly. If you have more than one control enclosure, you can keep part of the system running. However, you will lose access to the volumes that are on the affected I/O group and any volumes in other I/O groups that depend on the drives in the affected I/O group. If the system is still performing I/O requests in all the I/O groups, schedule the replacement during a maintenance period or other time when the I/O can be stopped.

Be careful when you are replacing hardware components in the back of the system that you do not inadvertently disturb or remove any cables that you are not instructed to remove.

Ensure that you are aware of the procedures for handling static-sensitive devices before you remove the enclosure.

To replace a control enclosure midplane assembly, complete the following steps.

  1. Log in to the service assistant on one of the node canisters in the control enclosure.
  2. Navigate to Enclosure Information.
    Record the following information for use in subsequent steps:
    • WWNN 1
    • WWNN 2
    • Machine type and model
    • Serial number
  3. Read the safety information in Preparing to remove and replace parts.
  4. If the control enclosure is still active, stop host I/O and Metro Mirror and Global Mirror activity on all the volumes that depend on the enclosure.
    This applies to all volumes in the I/O group that are managed by this enclosure plus any volumes in other I/O groups that depend on the drives in the affected I/O group.
  5. Apply Procedure: Powering off your system to the control enclosure that requires the midplane replacement.
  6. Apply Replacing the enclosure midplane of a powered off enclosure to the control enclosure.
  7. Reconnect power to the control enclosure.
    The node canisters restart. The fault LEDs are on because the new enclosure is not set with the identity of the old enclosure. The node canisters log node error 504, reporting that they are in the wrong location. In the system event log, the error code is 1192.
  8. Connect to the service assistant on one of the node canisters to configure the machine type and model, serial number, and WWNNs that are stored in the enclosure.
    If you have replaced a node canister, connect to the canister that has not been replaced.
    The service assistant retains a copy of the same information that was on the faulty enclosure midplane assembly. You can connect by using the previous service address. However, it is not always possible to maintain this address. If you cannot connect through the original service address, attempt to connect by using the default service address. If you still cannot access the system, see Problem: Cannot connect to the service assistant.
  9. Select Configure Enclosure.
  10. Use the node copy data that you recorded in step #v3700_rplc_cntrl_enc_midplane/record to update each of these values: Update WWNN 1, Update WWNN 2, Update the machine type and model, and Update the serial number.
    Attention: Do not update the system ID.
    If you were not able to record the values, use the node copy values only if none of them have all zeros as their value. If any of the node copy values are all zeros, connect the service assistant to the other node canister and configure the enclosure there. If you still do not have a full set of values, contact IBM support.
    Important: Step #v3700_rplc_cntrl_enc_midplane/modify writes the enclosure identity into the replacement midplane. The replacement midplane cannot be used as a replacement part for a different enclosure after step #v3700_rplc_cntrl_enc_midplane/modify is completed.
  11. From Enclosure Information, click Modify.
    The node canisters restart. When the restart finishes, the system comes online with both node canisters online.
    Note: In some situations, the canisters restart and report critical node error 508. If the node canisters fail to become active after they restart when the enclosure is updated, check their status by using the service assistant. If both node canisters show critical node error 508, use the service assistant to restart the nodes. For any other node error, see Procedure: Fixing node errors. To restart a node from the service assistant, complete the following steps:
    1. Log on to the service assistant.
    2. From the home page, select the node that you want to restart from the Changed Node List.
    3. Select Actions > Restart.
    The system starts and can handle I/O requests from any host systems.
  12. Wait until the node canister status LEDs show that the node canisters are running.
  13. Use the management GUI to check the status of all volumes and physical storage to ensure that everything is online.
  14. Go to Monitoring > Events to check the event log for other events or errors.
  15. Restart the host application and any FlashCopy activities, Global Mirror activities, or Metro Mirror activities that were stopped.