DS8000 Service Documentation Version 7.5

Exchange the storage enclosure power supply

Before you begin

Icon for electrostatic discharge wrist strapUse approved ESD procedures to prevent damage.

Attention:
  • This is not a stand-alone procedure. Customer disruption and damage to the hardware might occur if microcode and power boundaries are not in the proper conditions for this service action.
  • If you were sent here by a serviceable event FRU repair, the microcode and power boundaries have already been set.
  • If you were not sent here by a serviceable event FRU repair, see MAP1230 Replace a FRU without using a serviceable event.
Notes:
  • All the cables and FRUs to be removed must be uniquely identified so they can be reinstalled correctly.
  • If an installed earthquake resistance kit prevents you from accessing this FRU, refer to MAP1600.

Remove the storage enclosure power supply

Before you begin

Attention: Power supplies are hot-pluggable FRUs. Only remove one power supply at a time.

Procedure

  1. To locate this FRU, do one of the following and then return here and continue to replace the FRU:
    • If this FRU has a FRU identify indicator, use the FRU identify indicator, which is listed in MAP1240 Locating FRUs using identify indicators. If not, use the location code.
      Note: There might be cases where the FRU failure or fencing conditions prevent the FRU LED indicator from being lit even if the FRU has power.
    • Use the location code, which is listed in MAP1245 Finding FRUs by using location codes.
    • If there is no FRU identify indicator or location code, you were sent here by an isolation MAP or symbolic FRU procedure. Use the information in that procedure and the figures in this procedure to locate the proper part to exchange.
  2. Most, but not all, FRUs have identify indicators. Use the flashing amber or solid blue FRU identify indicators to ensure that you are working on the correct enclosure or FRU.
    • The "light path" identify LEDs are a hierarchy of LEDs that can identify the rack, enclosure, FRU, and even the FRU connector to which a cable is connected.
    • For more information, refer to MAP1240 Locating FRUs using identify indicators.
  3. At the rear of the rack, observe the partner power supply, which is not being replaced, in this storage enclosure. See Figure 1.
    The input power good LED Callout label 1 on the partner power supply must be lit before going to the next step. This will ensure that the storage enclosure remains powered while the failing power supply is removed. If the power good LED is not lit, DO NOT CONTINUE. Instead contact your next level of support.
    • Callout label 1 DC input good
    • Callout label 2 DC output good
    • Callout label 3 Identify/attention
    • Callout label 4 Not used
    Figure 1. Storage enclosure power supply LEDs
    Storage enclosure power supply LEDs
  4. Observe the storage enclosure power supply that is being replaced.
    • The input power LED Callout label 1 and the output power LED Callout label 2 will still be lit even though the HMC screen indicates the FRU was powered off. This is normal.
    • The power LEDs will be off after the input power cord is disconnected in the next step.
  5. At the power supply being replaced, release the power input cable from the retention bracket Callout label 1 and disconnect it. See Figure 2.
    Note: After the power input cable is disconnected, storage enclosure fans in the other power supply will shift from low to high speed.
    Figure 2. Storage enclosure power supply power input cable and retaining bracket
    Storage enclosure power supply power input cable and retaining bracket
  6. To remove components from the rear of the storage enclosure, you might need to:
    • Loosen cable ties
    • Remove the cable tray from the enclosure being serviced or the enclosure above it
    1. Loosen or release the cable ties holding the FC-AL and power cables as needed.
    2. If you need to remove the cable tray, release the cable ties. Then, lift up on the spring-loaded latches at the left and right end of the tray and then slide the tray to the rear. See Figure 3.
    Figure 3. Cable tray spring-loaded latch
    Cable tray spring-loaded latch
  7. To maintain proper cooling airflow through the storage enclosure, both power supplies must be physically installed, even if one of them is not functional. When a power supply is removed, it disrupts the airflow. Ensure you are ready to install the new power supply immediately after removing the old power supply.
  8. Are you replacing a power supply in the bottom storage enclosure of Rack-1 in a Model 951?
    • No, go to the next step.
    • Yes. The power supply will hit the Ethernet switch tray air baffle hinge Callout label 2. Remove the two screws Callout label 1, pivot the hinges inward and down, and slide the air baffle to the rear until the power supply can be removed, as shown in Figure 4. Then continue at the next step.
    Figure 4. Ethernet switch tray air baffle hinges (Model 951)
    Ethernet switch tray air baffle hinge
  9. Are you replacing the left power supply in the top storage enclosure in a rack with overhead cable management (top exit) for host and data cables?
    • No, go to the next step.
    • Yes, you must remove the upper cable channel assembly Callout label 2. See Figure 5.
      1. Loosen the retaining screw Callout label 1.
      2. Pivot the upper cable channel assembly Callout label 2 to the right and lift it out of the tab slot Callout label 3.
    Figure 5. Top tailgate upper cable channel assembly
    Top tailgate upper cable channel assembly
  10. Push the orange retaining clip Callout label 1 to the right, and pull the power supply latch handle Callout label 2 out and down. See Figure 6.
    Figure 6. Storage enclosure power supply latch handle and retaining clip
    Storage enclosure power supply latch handle and retaining clip
  11. Pull the power supply straight out from the storage enclosure.

Install the storage enclosure power supply

Procedure

  1. Slide the new power supply into the storage enclosure and push the power supply latch handle up and in until it latches into place.
  2. If the Ethernet switch tray air baffle was removed, reinstall it now.
  3. Install the sheet metal cable tray, if it was removed. Ensure both spring-loaded latches are secure.
  4. Secure the FC-AL cables and power cables with the cable ties, as needed.
  5. Connect the input power cord to the power supply.
  6. Secure the input power cord with the retention bracket.
  7. If you removed the top tailgate upper cable channel assembly, install it now.
  8. Exit this service information center parts exchange procedure and return to the procedure that sent you here.