Replacing an Electrical Module

Impact on the System

During the replacement of an electrical module, the system switches services from the port of the electrical module to another redundant port. If available links are unable to carry the current service load, the service I/O response latency increases and the system performance deteriorates. If there are no other redundant links, services run on a single link and the system reliability decreases. You are advised to replace an electrical module in off-peak hours.

Prerequisites

• The replacement electrical module (spare part) has been prepared.
• The interface module that houses the electrical module you want to replace has been located.

  You can locate a component in either of the following ways:

  • Locating a component based on alarms in DeviceManager: On the Alarms and Events page of DeviceManager, view the help information and determine the ID of the component to be replaced. Then locate the component at your site based on its ID.
  • Locating a component based on the status of its Running/Alarm indicator: For details about the indicators on different components, see Indicator Introduction of each component in the Product Description specific to your product model and version.

Precautions

• Remove and insert an electrical module with even force. Excessive force may damage the appearance or connectors of the electrical module.
• Do not repeatedly or quickly remove or insert an electrical module; otherwise, it may be damaged.
• After removing an electrical module, wait at least 15 seconds before inserting one. Otherwise, the system cannot identify the status change of the electrical module.

Tools and Materials

• ESD wrist strap
• ESD bag
• Labels

Procedure

1. Perform a pre-replacement check.
   1. Check system status.

      Start SmartKit and choose Home > Storage > Routine Maintenance > Health Check. On the Health Check page, perform inspection as instructed. For details, see Checking System Status.

      If any items fail the inspection, rectify the faults by performing the recommended actions in the inspection reports. Ensure that all other parts except the parts to be replaced are working properly.

   2. Check the status of the parts to be replaced.

      Start SmartKit and choose Home > Storage > Parts Replacement > More > Parts Replacement (CRU). On the CRU replacement page, complete the check before the replacement as prompted. For details, see Replacing a CRU.

      You can proceed to next steps only when all items pass the pre-replacement check and the replacement page is displayed. If any item fails, rectify the fault as prompted.

2. Wear an ESD wrist strap.
3. Remove the network cables connected to the electrical module to be replaced.
4. Open the latch of the electrical module, and pull out the electrical module, as shown in Figure 7-164.
   Figure 7-164 Removing the electrical module
   

5. Put the removed electrical module into an ESD bag.
6. Take the replacement electrical module out of its ESD bag.
7. Insert the replacement electrical module into the port, as shown in Figure 7-165.
   • Before inserting an electrical module, ensure that its latch is completely closed.
   • Insert the electrical module until you hear a "click" sound or feel a slight shake, which indicates that the electrical module is inserted in place.
   • If the electrical module is not inserted in place, it will fall out or will cause an unexpected link interruption.
   Figure 7-165 Installing the replacement electrical module
   

8. Insert the network cables into the electrical module.
9. Observe the port indicator to check whether the electrical module has been properly installed.
   • If the indicator is steady green or blue, the installation is successful.
   • If the indicator is steady yellow or off, the newly installed electrical module is faulty, the slot for the electrical module is faulty, or the electrical module is incorrectly installed.

10. Confirm the replacement.
    1. Perform a post-replacement inspection.

       After the parts replacement, return to the SmartKit page and click Replaced. Then complete the check after the replacement as prompted.

    2. Check system status.

       Choose Home > Storage > Routine Maintenance > Health Check to check the system status again. If any inspection item fails, rectify the fault based on the suggestions in the inspection report.

    3. After the preceding procedure is complete, check services on the host for storage-related errors.

Follow-up Procedure

After the electrical module is replaced, label it to facilitate subsequent operations.