Replacing the real-time clock battery

You can replace a failed real-time clock (RTC) battery nondisruptively in an NS224 drive shelf that is powered on, and while I/O is in progress.

Before you begin

About this task

You can use the following video or the written steps to replace an RTC battery.

Steps

  1. Properly ground yourself.
  2. Disconnect the cabling from the NSM module 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 unplug the power cord from the power supply.
      Power supplies do not have a power switch.
    2. Disconnect the storage cabling from the NSM module ports.
      Make a note of the NSM module ports that each cable is connected to.You reconnect the cables to the same ports when you reinsert the NSM module, later in this procedure.
  3. Remove the NSM module from the shelf:
    1. Loop your index fingers through the finger holes of the latching mechanisms on either side of the NSM module.
      Note: If you are removing the bottom NSM module, and if the bottom rail is obstructing access to the latching mechanisms, place your index fingers through the finger holes from the inside (by crossing your arms).
    2. With your thumbs, press down and hold the orange tabs on top of the latching mechanisms.
      The latching mechanisms raise, clearing the latching pins on the shelf.
    3. Gently pull forward until the NSM module is about one third of the way out of the shelf, grasp the NSM module sides with both hands to support its weight, and then place it on a flat stable surface.
      When you begin pulling forward, the latching mechanism arms extend from the NSM module and lock in their fully extended position.
  4. Loosen the NSM module cover thumb screw and open the cover.
    The FRU label on the NSM module cover shows the location of the RTC battery, near the front of the NSM module and to the right of the power supply.
  5. Physically identify the failed RTC battery.
    The RTC battery attention (amber) LED, located on the board next to the battery slot, illuminates.
    Note: The LED for the failed RTC battery remains illuminated for 10 minutes after you remove the NSM module from the shelf.
  6. Replace the RTC battery:
    1. Remove the battery by gently pushing it away from the holder until it is at an inclined angle (tilted away from the holder), and then lift it out of the holder.
    2. Insert the replacement battery into the holder at an inclined angle (tilted away from the holder), push it into an upright position, and then press it firmly into the connector until it is fully seated.
      Note: The positive side of the battery, marked with a plus sign, is oriented outward (away from the holder), corresponding to the plus sign marked on the NSM module board.
  7. Close the NSM module cover, and then tighten the thumb screw.
  8. Reinsert the NSM module into the shelf:
    1. Make sure that the latching mechanism arms are locked in the fully extended position.
    2. Using both hands, gently slide the NSM module into the shelf until the weight of the NSM module is fully supported by the shelf.
    3. Push the NSM module into the shelf until it stops (about half an inch from the back of the shelf).
      You can place your thumbs on the orange tabs on the front of each finger loop (of the latching mechanism arms) to push in the NSM module.
    4. Loop your index fingers through the finger holes of the latching mechanisms on either side of the NSM module.
      Note: If you are inserting the bottom NSM module, and if the bottom rail is obstructing access to the latching mechanisms, place your index fingers through the finger holes from the inside (by crossing your arms).
    5. With your thumbs, press down and hold the orange tabs on top of the latching mechanisms.
    6. Gently push forward to get the latches over the stop.
    7. Release your thumbs from the tops of the latching mechanisms, and then continue pushing until the latching mechanisms snap into place.
      The NSM module should be fully inserted into the shelf and flush with the edges of the shelf.
  9. Reconnect the cabling to the NSM module:
    1. Reconnect the storage cabling to the same two NSM module 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 module port LNK (green) LEDs illuminate. If a LNK LED does not illuminate, reseat the cable.

  10. Verify that the attention (amber) LEDs on the NSM module containing the failed RTC battery and the shelf operator display panel are no longer illuminated.
    When the replacement RTC battery's voltage is sufficient, the attention LEDs turn off.
  11. Verify that the NSM module is cabled correctly.
    You can download and run Active IQ Config Advisor to verify cabling. If any cabling errors are generated, follow the corrective actions provided.

    NetApp Downloads: Config Advisor