Replace a NEM

The server modules must be informed if you are replacing a non-redundant NEM.

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Caution - If the chassis is powered on and you are not replacing the NEM within 60 seconds, install an NEM filler panel to ensure proper system operation.

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Caution - If you are replacing a functional SAS2 NEM (for example replacing a NEM with a NEM) and another SAS2 NEM is installed in the chassis, make sure that multipathing at the OS level is enabled on all active server blades in the chassis before you remove the existing NEM. This ensures that the primary path to disks is not lost, which can cause an OS panic. For servers running Windows 2003, which does not support multipathing, shut down I/O to all disks on the disk module that is not in hardware RAID volumes.

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If you are removing a NEM from a powered on chassis, read the hot-plug guidelines Performing Hot-plug Insertion and Removal and follow the instructions in Prepare the PCIe Interface for Hot-plug Removal.

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Caution - Before replacing a NEM, make sure that you have backed up the SAS assignment configuration, as described in Saving the Zoning Configuration to a Backup File.

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1. In the rear of the chassis, locate the NEM that you want to remove.
2. Do one of the following:
   • If you are replacing a NEM in a powered-off chassis, go to Step 6.
   • If you are replacing a NEM in a powered-on chassis, continue with Step 3.

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   Note - Hot-plug service has to be enabled on all blades in the chassis for a hot-plug removal to properly initiate. If the Ready-to-Remove LED does not light, check the configuration of the blades, or power off all of them.

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3. Push the ATTN button once.

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   Note - Pushing the ATTN button twice within five seconds will cause the Power/OK LED to return to solid green. This action will cancel the request for a NEM removal.

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4. View the behavior of the Power/OK LED and Ready-to-Remove LED or the ILOM interface to determine if the Ready-to-Remove action is successful.

   If the action is successful:

   • The NEM green Power/OK begins to slowly blink.

   • The OK- to-Remove blue LED illuminates and the Power LED turns off.

   • In the ILOM System Information —> Components screen: The Return-to-Service option is available in the Actions drop-down list for the NEM and the Ready-to-Remove status column for the NEM is Ready.

   • In the ILOM CLI show /CH/NEMx command output, the following status is listed in the Properties section: prepare_to_remove_status = Ready

   • /CH/NEMx/OK reads Off in either the ILOM web interface or CLI.

   If the action is unsuccessful:

   • The NEM green Power/OK LED begins to slowly blink, then returns to solid green, and the Ready-to-Remove LED does not go on.

   • In the ILOM System Information —> Components screen, the Return-to-Service option does not become available in the Actions drop-down list and the Ready-to-Remove status column for the NEM still reads Not Ready.

   • In the ILOM CLI show /CH/NEMx command output, the following status is listed in the Properties section: prepare_to_remove_status = NotReady

   • /CH/NEMx/OK reads On in either the ILOM web interface or CLI.

5. Do one of the following:
   • If the Ready-to-Remove action is successful, proceed with Step 6.
   • If the Ready-to-Remove action is not successful, do not remove the NEM. Follow the instructions in Forcing NEM Graceful Removal to remove the NEM.
6. Label the cables so that you can install them in the same location, then remove all cables from the NEM.
7. Press together and hold the buttons on both the right and left ejector levers.
8. To unlatch the NEM from the chassis, open the ejector levers by extending them outward.
9. Holding the open ejector levers, pull the NEM toward you until you can pull the rest of the module out by hand.

   Support the weight of the NEM, with one hand at the bottom of the NEM.

   
   

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   Note - Wait at least 10 seconds before installing the new NEM.

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10. Insert the new NEM into the chassis.
11. Do one of the following:
    • If you have replaced a NEM in a powered-off chassis, go to Step 16.
    • If you have replaced a NEM in a powered-on chassis, continue with Step 12.
12. After the NEM has been inserted into a chassis slot, wait until the Power/OK LED goes to standby blink.

    Standby blink indicates that the NEM is in standby mode.

13. Press the ATTN button once.

    It can take up to three minutes for the NEM to come online.

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    Note - If you push the ATTN button twice within five seconds, the green Power/OK LED remains in standby blinking mode, and the request for bringing the NEM online is cancelled.

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14. View the behavior of the Power/OK LED or the ILOM interface.

    The NEM is online and the PCIe interfaces are available to the blades when the following occurs:

    • The NEM green Power/OK LED illuminates solid.

    • In the ILOM web interface System Information —> Components screen, the Prepare-to-Remove option is available in the Actions drop-down list for the NEM.

    • In the ILOM CLI show /CH/NEMx output, the following status shows in the Properties section: prepare_to_remove_status = NotReady.

15. See Restoring SAS Configurations After NEM Installation to see if any additional actions need to be taken for the SAS interfaces.
16. Reconnect all the cables in their original locations.

Related Information

• Verifying NEM Installation

• Remove a NEM

• Installing and Removing SFP+ Optical Transceiver Modules

• SFP+ Connector Cabling Options

• Understanding the NEM

• Performing Hot-plug Insertion and Removal

• Restoring SAS Configurations After NEM Installation