Replacing an Optical Module

Impact on the System

During the replacement of an optical module, the system switches services from the port of the optical module to another redundant port.

• For front-end and scale-out links, 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.
• For back-end links, disks in a loop run on a single link and the system reliability decreases.

You are advised to replace an optical module in off-peak hours.

Prerequisites

• The spare part is on hand.
• You have located the interface module that houses the optical module you want to replace.

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

Tools and Materials

• ESD wrist strap
• ESD bag
• Labels

Procedure

1. Check status before replacement.
   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. 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 optical fibers connected to the optical module to be replaced.

   Do not look into the optical port without eye protection. The laser beam on the optical interface board or from the fiber may cause injuries to eyes.

4. Remove the optical module as follows based on your optical module type.
   • Open the latch of the optical module, and pull out the optical module, as shown in Figure 7-160.
     Figure 7-160 Removing the optical module
     
   • Hold the handle and pull out the optical module, as shown in Figure 7-161.
     Figure 7-161 Removing the optical module
     

5. Put the removed optical module into an ESD bag.
6. Take the spare part out of its ESD bag.
7. Remove the protective cap from the replacement optical module, and insert the replacement optical module into the port, as shown in Figure 7-162 and Figure 7-163.
   • Before inserting an optical module, ensure that its latch is completely closed.
   • Insert the optical module to the enclosure until you hear a "click" sound or feel a slight shake, which indicates that the optical module is inserted in place.
   • If the optical module is not inserted in place, it will fall out or will cause a link fault.
   Figure 7-162 Installing the replacement optical module
   
   Figure 7-163 Installing the replacement optical module
   

8. Insert the optical fibers into the optical module.

   Do not look into the optical port without eye protection. The laser beam on the optical interface board or from the fiber may cause injuries to eyes.

   Insert the optical fibers until they snap into place.

9. Observe the port indicator to check whether the optical module is 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 optical module is faulty, the optical module slot is faulty, or the optical 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 the system status after the replacement.

       Return to the home page, choose Home > Storage > Routine Maintenance > Health Check, and 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. If any storage-related error is reported, contact Huawei technical support.

Follow-up Procedure

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