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Install and maintain

Replace a DIMM - NX224 shelves

Contributors netapp-ivanad netapp-jsnyder
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You can replace a faulty DIMM nondisruptively in an NX224 drive shelf that is powered on, and while I/O is in progress.

About this task

  • Allow at least 70 seconds between removal and installation of the NVMe shelf module (NSM).

    This allows enough time for ONTAP to process NSM removal event.

  • Best practice: The best practice is to have current versions of NVMe shelf module (NSM) firmware and drive firmware on your system before replacing FRU components. You can visit the NetApp Support Site to download disk shelf firmware and download disk drive firmware.

    Note

    Do not revert firmware to a version that does not support your shelf and its components.

  • If needed, you can turn on the shelf's location (blue) LEDs to aid in physically locating the affected shelf: storage shelf location-led modify -shelf-name shelf_name -led-status on

    If you do not know the shelf_name of the affected shelf, run the storage shelf show command.

    A shelf has three location LEDs: one on the operator display panel and one on each NSM. Location LEDs remain illuminated for 30 minutes. You can turn them off by entering the same command, but using the off option.

  • When you unpack the replacement DIMM, save all packing materials for use when you return the failed DIMM.

    If you need the RMA number or additional help with the replacement procedure, contact technical support at NetApp Support, 888-463-8277 (North America), 00-800-44-638277 (Europe), or +800-800-80-800 (Asia/Pacific).

Before you begin

  • The shelf's partner NSM must be up and running, and be cabled correctly so that your shelf maintains connectivity when you remove the NSM with the failed FRU (target NSM). You can verify the partner NSM's status by downloading and running Config Advisor.

  • All other components in the system, including the other three DIMMs, must be functioning properly.

Steps

  1. Properly ground yourself.

  2. Disconnect the cabling from the NSM that contains the FRU that you are replacing:

    1. Disconnect the power cord from the power supply by opening the power cord retainer and then unplugging the power cord from the power supply.

      Power supplies do not have a power switch.

    2. Disconnect the storage cabling from the NSM ports.

      Make a note of the NSM ports that each cable is connected to. You reconnect the cables to the same ports when you reinsert the NSM, later in this procedure.

  3. Insert the NSM into the shelf:

    Replace the NSM.
    Callout number 1

    If you rotated the NSM handles upright (next to the tabs) to move them out of the way while you serviced the NSM, rotate them down to the horizontal position.
    Callout number 2

    Align the rear of the NSM with the opening in the shelf, and then gently push the NSM using the handles until it is fully seated.
    Callout number 3

    Rotate the handles to the upright position and lock in place with the tabs.

  4. Open the NSM cover by turning the thumbscrew counterclockwise to loosen, and then open the cover.

    The FRU label on the NSM cover shows the location of the four DIMMs in the NSM.

  5. Physically identify the faulty DIMM.

    When a DIMM is faulty, the system logs a warning message to the system console indicating which DIMM needs to be replaced.

  6. Remove the faulty DIMM:

    Remove DIMMs.
    Callout number 1

    DIMM slot numbering and positions.
    Callout number 2

    • Note the orientation of the DIMM in the socket so that you can insert the replacement DIMM using the same orientation.

    • Eject the faulty DIMM by slowly pushing apart the two DIMM ejector tabs on both ends of the DIMM slot.

    Important Carefully hold the DIMM by the corners or edges to avoid pressure on the DIMM circuit board components.
    Callout number 3

    Lift the DIMM up and out of the slot.

    The ejector tabs remain in the open position.

  7. Replace the DIMM:

    1. Remove the replacement DIMM from its antistatic shipping bag.

    2. Hold the DIMM by the corners, and then insert the DIMM squarely into a slot.

      The notch on the bottom of the DIMM, among the pins, should line up with the tab in the slot.

      When inserted correctly, the DIMM should go in easily but fit tightly in the slot. If not, reinsert the DIMM.

    3. Push down carefully, but firmly, on the top edge of the DIMM until the ejector tabs snap into place over the notches at both ends of the DIMM.

  8. Close the NSM cover, and then tighten the thumb screw.

  9. Insert the NSM into the shelf:

    Replace the NSM.
    Callout number 1

    If you rotated the NSM handles upright (next to the tabs) to move them out of the way while you serviced the NSM, rotate them down to the horizontal position.
    Callout number 2

    Align the rear of the NSM with the opening in the shelf, and then gently push the NSM using the handles until it is fully seated.
    Callout number 3

    Rotate the handles to the upright position and lock in place with the tabs.

  10. Reconnect the cabling to the NSM:

    1. Reconnect the storage cabling to the same eight NSM ports.

      Cables are inserted with the connector pull-tab facing up. When a cable is inserted correctly, it clicks into place.

    2. Reconnect the power cord to the power supply, and then secure the power cord with the power cord retainer.

      When functioning correctly, a power supply's bicolored LED illuminates green.

      Additionally, both NSM port LNK (green) LEDs illuminate. If a LNK LED does not illuminate, reseat the cable.

  11. Verify that the attention (amber) LEDs on the NSM containing the failed DIMM and the shelf operator display panel are no longer illuminated.

    The NSM attention LEDs turn off after the NSM reboots and no longer detects a DIMM issue. This can take three to five minutes.

  12. Verify that the NSM is cabled correctly, by running Config Advisor.

    If any cabling errors are generated, follow the corrective actions provided.