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FusionStorage OBS 7.0 Parts Replacement 05

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Replacing a CPU

Replacing a CPU

NOTE:

This chapter applies to 2288H V5 12-slot nodes and 5288 V5 36-slot nodes.

A CPU provides powerful data processing capabilities and integrates the memory controller and the Peripheral Component Interconnect Express (PCIe) controller.

Impact on the System

Before replacing a CPU on a storage node, you must power off the node. This will adversely affect the services running on the node.

Prerequisites

  • The spare CPU is ready.
  • The faulty CPU has been located.

Precautions

When you replace a CPU, wear an electrostatic discharge (ESD) wrist strap instead of ESD gloves. The gloves may catch on pins on the CPU socket and damage it.

Tools and Materials

  • Flat-head screwdrivers
  • Phillips screwdrivers
  • ESD wrist straps
  • ESD bags
  • Labels

Replacement Process

Replace a CPU by following the process shown in Figure 15-1.

Figure 15-1 CPU replacement process

Procedure

  1. Remove the storage node from its cabinet and remove the chassis cover. For details, see Basic Operations.
  2. Remove the air duct.

    Lift the air duct according to the signs on the air duct, as shown in the following figures.
    Figure 15-2 Removing the air duct of a 2288H V5 node
    Figure 15-3 Removing the air duct of a 5288 V5 node

  3. Remove the heat sink.

    1. Use a Phillips screwdriver to loosen the four screws on the heat sink (the two pairs of screws that correspond to 2 on the heat sink label), as shown in step 1 in Figure 15-4. Then loosen the two screws in the diagonal direction on the heat sink (the pair of screws that correspond to 1 on the heat sink label), as shown in step 2 in Figure 15-4.
      Figure 15-4 Removing a heat sink
    2. Lift the heat sink and place it upside down on an ESD table.

  4. Remove the carrier with a CPU inside.

    1. Insert a flat-head screwdriver into the release slot of the CPU carrier and twist the screwdriver to raise one edge of the carrier, as shown in step 1 in Figure 15-5.
      Figure 15-5 Removing a carrier with a CPU inside
    2. Pinch the CPU carrier on the other edge, as shown in step 2 in Figure 15-5. Remove the CPU carrier with the CPU inside from the heat sink in the arrow direction, as shown in step 3 in Figure 15-5.

  5. Pull out the CPU.

    1. Bend the carrier edge with a triangular hole in the arrow direction to release the CPU from the carrier, as shown in Figure 15-6.
      NOTE:

      When removing the CPU, hold the CPU and CPU carrier to prevent them from falling.

      Figure 15-6 Removing a CPU (1)
    2. Hold both sides of the CPU to lift it upwards, as shown in Figure 15-7.
      Figure 15-7 Removing a CPU (2)
    3. Place the removed CPU in an ESD bag.

      The CPU socket cannot be exposed and must be covered by a CPU or a protective cover during transportation and storage.

  6. Install the CPU in the carrier.

    • Do not horizontally move the CPU if it is not properly placed to avoid twisting any pins. Lift the CPU until it is out of the socket, and then place it in the socket properly.
    • Before installing a CPU, use a clean, alcohol-moistened cloth to remove excess oil or foreign matter from the surface of the CPU, heat sink, and CPU carrier.
    1. Take the spare CPU out of its ESD bag.
    2. Align the notch in the center of one CPU edge with the protrusion on the CPU carrier and secure it, as shown in Figure 15-8.

      Ensure that the CPU corner marked with a triangle is in the corner of the carrier with a triangular hole.

      Figure 15-8 Installing one edge of a CPU
    3. Bend the other edge of the CPU carrier in the direction of the arrow, as shown in Figure 15-9.
      Figure 15-9 Installing the other edge of a CPU
    4. Release the CPU carrier so that the other edge of the CPU clips into place. Check that the CPU is securely installed and level with the carrier. Press down to secure any raised parts.
    5. Paste thermal compound.
      Determine the area on the CPU that will be in contact with the heat sink, and use a clean blade or card to evenly paste 0.4 ml of thermal compound on the area.
      NOTE:

      The thermal compound injector has volume marks.

      Six methods for pasting thermal compound are shown in Figure 15-10. Dual-line, five-point, S-shaped, and cross pasting methods are recommended.

      Figure 15-10 Pasting methods

      The thermal compound layer is as thick as a piece of common paper. Figure 15-11 shows the smeared thermal compound layer. Ensure that the thermal compound is evenly and fully painted.

      Figure 15-11 Smeared thermal compound layer

  7. Install the CPU carrier.

    1. Install the CPU carrier on the heat sink and ensure that all retaining clips have been inserted, as shown in Figure 15-12.

      Ensure that the CPU corner marked with a triangle is in the notched corner of the heat sink.

      Figure 15-12 Installing a CPU carrier
    2. Place the heat sink on a work surface and check that the CPU carrier is securely installed. Press down to secure any raised parts, as shown in Figure 15-13.
      Figure 15-13 Checking the retaining clips

  8. Install the heat sink.

    1. Shine a light at various angles onto the CPU bonding pad and the CPU socket and check for bent pins, foreign matter, and bonding pad damage.

      If a CPU socket has bent pins or contains foreign matter, or the bonding pad is damaged, stop the installation and contact Huawei technical support.

    2. Align the two diagonal holes of the heat sink with the retaining clips on the CPU socket and gently position the CPU and heat sink in place.

      Do not touch the CPU parts and socket pins.

    3. Tighten the two screws in the diagonal direction on the heat sink (the pair of screws that correspond to 1 on the heat sink label), as shown in step 1 in Figure 15-14. Then tighten the four screws on the heat sink (the two pairs of screws that correspond to 2 on the heat sink label), as shown in step 2 in Figure 15-14.
      Figure 15-14 Installing a heat sink

  9. Install the air duct.

    Align the positioning pins on the air duct with the fixing holes on the mainboard according to the instructions on the chassis, and vertically place the air duct downwards, as shown in the following figures.
    Figure 15-15 Installing the air duct of a 2288H V5 node
    Figure 15-16 Installing the air duct of a 5288 V5 node

  10. Install the chassis cover and put the storage node into the cabinet. For details, see Basic Operations.
  11. Connect the storage node to the power sockets and peripheral devices according to the cable connection labels. Ensure that all cables are correctly connected and then power on the storage node. If the storage node is not powered on, press the power button on the front panel.
  12. Use the KVM to log in to the storage node as user root.
  13. Check whether the CPU is successfully installed.

    1. When the screen shown in Figure 15-17 is displayed during the system startup, press Delete.
      Figure 15-17 BIOS startup page
      NOTE:

      If a dialog box that informs you of entering the password is displayed, enter the BIOS password (default: Admin@9000).

    2. The BIOS interface is displayed. View the CPU information and check whether the CPU is successfully installed, as shown in Figure 15-18.
      Figure 15-18 Viewing the CPU information
    NOTE:
    • If the displayed CPU information matches the actual CPU information, the CPU is successfully installed. In this case, restart the device.
    • If the CPU information is not displayed or is different from the actual CPU information, the CPU fails to be installed. In this case, reinstall it.

  14. Check the system status.

    On SmartKit, choose Home > Storage > Routine Maintenance > More > Inspection and check the system status.
    • If all inspection items pass the inspection, the inspection is successful.
    • If some inspection items fail, the inspection fails. Rectify the faults by taking recommended actions in the inspection reports. Perform inspection again after fault rectification. If the inspection still fails, contact Huawei technical support.

    For details, see the FusionStorage OBS Administrator Guide.

Follow-up Procedure

Label the replaced CPU to facilitate subsequent operations.

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Updated: 2019-07-05

Document ID: EDOC1100051325

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