Removing and replacing the power-cable assembly: 2145-CG8 or 2145-CF8

You can remove and replace the power-cable assembly if you have problems with the power supply and suspect that a power or signal cable is defective.

Before you begin

The power-cable assembly is composed of two power cables in a SAN Volume Controller 2145-CG8 or 2145-CF8 node and a signal cable that are bound together. You can remove the power-cable assembly if you have problems with the power supply and suspect that a power or signal cable is defective.

Make sure that power to the SAN Volume Controller 2145-CG8 or 2145-CF8 node is turned off before you remove the power-cable assembly. When removing the power-cable assembly, ensure that you also remove it from the uninterruptible power supply.

Turn off the node, ensuring that its data is mirrored and synchronized, as described in MAP 5350: Powering off a node.

About this task

To remove the power-cable assembly, complete steps 1 through 7.

To replace the power-cable assembly, complete steps 8 through 12.

Procedure

Removing the power-cable assembly

  1. Check the SAN Volume Controller 2145-CG8 or 2145-CF8 node power LED ( 1  in Figure 1).
    • If the light is on, go to step 2.
    • If the light is either off or flashing, power is already removed from the SAN Volume Controller node. Go to step 7.
    Figure 1. Power LED on the 2145-CG8 or 2145-CF8 operator-information panel
    2145-CG8 or 2145-CF8 Power LED
    •  1  Power LED
    Important: Nodes operate in pairs. Both nodes are in the same I/O group. One node must be operational if you are servicing the other node. If both nodes are not functioning, you cannot access any of the disks in that I/O group.
  2. Before you turn off the node, ensure that its data is mirrored and synchronized. For more information, see MAP 5350: Powering off a node.
    Attention: If both SAN Volume Controller nodes are online, removing the power from one SAN Volume Controller can cause performance degradation while I/O operations are automatically rerouted to other SAN Volume Controller . Ensure that this performance outcome is acceptable before continuing with this procedure.
  3. Press and release the power-control button  1  shown in Figure 1. Wait 1 minute for the SAN Volume Controller to turn off. Ignore a missing node error code if displayed by other nodes in the cluster. When maintenance procedures are completed, the error resolves itself.
  4. If necessary, pull back the cable-management arm, remove any cable ties or hook-and-loop fasteners that might be securing the power cords, and free the power cords from the cable-management arm.
  5. Remove the cable-retention bracket. See Removing the cable-retention bracket for details.
  6. Remove the cable-retention bracket from the 2145 UPS-1U .
  7. Remove each power cord and serial cable from the back of the node.

Replacing the power-cable assembly

  1. Replace each power cord and verify that each cord that you replace is seated well.
  2. Replace the serial cable for the node and verify that each serial cable that you replace is seated well.
  3. Replace the cable-retention bracket and the 2145 UPS-1U cable-retention bracket.
  4. If possible, route the power cords on the cable-management arm, secure the power cords with cable ties or hook-and-loop fasteners, and close the cable-management arm.
  5. If the node does not turn on automatically, press and release the power-control button.
    Note: The 2145 UPS-1U turns off only when its power button is pressed, input power has been lost for more than five minutes, or the node has shut it down following a reported loss of input power.