Replacing the battery backplane and cables: 2145-DH8

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You can replace the battery backplane and cables in a SAN Volume Controller 2145-DH8 node.

Before you begin

DANGER
Multiple power cords. The product might be equipped with multiple power cords. To remove all hazardous voltages, disconnect all power cords. (L003)
Multiple plugs: first set
 or
Multiple plugs: second set
 or
Multiple plugs: third set
This service action assumes:
  • The node is turned off. If you must turn off the node, ensure that its data is mirrored and synchronized, and that there are no dependent volumes, as described in MAP 5350: Powering off a node.
  • The power cables are disconnected.
  • The top cover is removed.
  • The batteries are removed.
  • The air baffle is removed.
  • The PCI express riser assemblies are removed.

About this task

To replace the SAN Volume Controller 2145-DH8 battery backplane or the attached cables, complete the following steps as needed. It is easier to connect all cables, except for the power cable, to the battery backplane before the backplane is fitted. Figure 1 and Figure 2 show the backplane and associated cables.

Figure 1. 2145-DH8 Battery backplane-power sense, LPC, and LED cables
2145-DH8 Battery backplane-power sense, LPC and LED cables
  •  1  Power sense cable
  •  2  Low Pin Count (LPC) interface cable
  •  3  LED cable
Figure 2. 2145-DH8 Battery backplane-power and EPOW cables
2145-DH8 Battery backplane-power and EPOW cables
  •  1  Power cable
  •  2  Emergency power off Warning (EPOW) cable

Procedure

Power Sense cable (power supply unit end that is shown in Figure 3)

  1. Attach the power sense cable between the power sense cable from the power supply unit and the system board.
    Figure 3. Power sense cable connection between the power supply and the system board
    Power sense cable connection between the power supply and the system board
  2. Rout the power sense cable to the front of the 2145-DH8.

Power Cable (power supply end that is shown in Figure 4)

  1. Position the power connector from the power supply unit, flat against the power supply unit case and then fit the power cable.
    Figure 4. Power cable connection between the power supply unit and the system board
    Power cable connection between the power supply unit and the system board
  2. Bend the power cable so that it fits between the memory DIMM slots and the end of the PCI express riser card assemblies.

Verify that the PCI express riser card assembly can be fitted

  1. The power cable touches the PCI express riser card assembly, and care must be taken when fitting the assembly that the cable is not pinched.
  2. Remove the PCI express riser card assembly so that it is easier to fit the next section of the power cable.
  3. Verify that the power sense cable is not pulled out.

Power Cable Dummy DIMM (Power Cable Dummy DIMMs fit into the two DIMM sockets.)

  1. If the dummy DIMMs have covers fitted to protect the ends during shipping, then remove them.
  2. Part the cables at each end of the dummy DIMM so that the DIMM catch passes through the gap between the cables.
  3. Press the dummy DIMM down to lock in position in slot 6, and bend the cable to avoid the raised heat sink, as shown in Figure 5.
    Figure 5. Bend the power cable after the dummy DIMM to avoid the heat sink
    Bend the power cable after the dummy DIMM to avoid the heat sink
  4. Fit the second dummy DIMM in slot 3, following steps 8 and 9.
  5. Route the power cables next to the fan.

Emergency power-off warning (EPOW)

  1. Replace the EPOW cable from the system board to the disk drive backplane and from the system board to the battery backplane.
    Note: The short wire connects to the disk drive backplane and the long wire to the battery backplane.

LPC Cable adapter

  1. Locate the LPC connector on the system board.
  2. Fit the LPC adapter board to the LPC connector on the system board, as shown in Figure 6.
    Figure 6. The LPC adapter fitted to the LPC connector on the system board, two views
    The LPC adapter that is fitted to the LPC connector on the system board
    Alternative view of the LPC adapter that is fitted to the LPC connector on the system board

LPC Cable Routing

  1. Route the LPC cable from the battery backplane past the fans then inside the cable trunking next to the DIMMs.
  2. Continue around the PCI express riser card assembly and attach to the LPC adapter on the LPC connector.

LED Cable

  1. Route the LED cable from the battery backplane through the bay below the operator-information panel.

Battery backplane (shown in Figure 7)

  1. Fit the lower edge of the battery backplane into the chassis, and push the top into position until it locks in place.
    Figure 7. Fitting the battery backplane
    Fitting the battery backplane
  2. Connect the end of the power cable to the battery backplane.
  3. Verify that all of the signal cables are connected to the battery backplane.
  4. If you removed the bezel to connect the LED cable to the node LEDs, then replace it now.
  5. Replace the PCI express riser card assemblies in the original order.
  6. Replace the air baffle.
  7. Replace the batteries.
  8. Replace the top cover.
  9. If you removed the node from the rack, replace the node in the rack.
  10. If you removed any Fibre Channel or Ethernet cables, use the labels on each cable to replace them in the same ports from which they were removed.
  11. If you removed the power cords, replace the power cords.
  12. Lift the locking levers ( 1  in Figure 8) on the slide rails and push the server  2  all the way into the rack until it clicks into place.
    Figure 8. Raising the 2145-DH8 locking levers of the slide rails of the rack
    Raising the 2145-DH8 locking levers of the slide rails of the rack
  13. Turn on the node.