Removing the redundant AC-power switch: 2145-CG8 or 2145-CF8

Use this topic when you need to remove a redundant AC-power switch on a SAN Volume Controller 2145-CG8 or 2145-CF8 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)

or

or

Use the reference numbers in parentheses at the end of each notice (for example, D005) to find the matching translated notice in IBM System Storage SAN Volume Controller Safety Notices.

1. Turn off each SAN Volume Controller node that is connected by an uninterruptible power supply to the redundant AC-power switch. See MAP 5350: Powering off a node.
   1. One or two nodes might be connected to the redundant AC-power switch. If two nodes are connected to the redundant AC-power switch, you must ensure that both nodes are not in the same I/O group before you turn off the nodes. If the nodes are both turned off and they are in the same I/O group, the customer loses access to the data that is managed by that I/O group.
   2. If both nodes that are powered by the redundant AC-power switch are in the same I/O group, turn off one node, disconnect it from the redundant AC-power switch, and connect it to a different power source. Then, turn the node back on. When it recovers and rejoins the I/O group, it can maintain the I/O access when the other node is turned off and when the redundant AC-power switch is removed. When you perform this operation, pay particular attention to checking when it is safe to turn off the second node. See MAP 5350: Powering off a node.
2. Remove both the redundant AC-power switch input-power cables from the site power distribution unit and unthread them in the rack, so they slide out when the redundant AC-power switch is removed. There might be enough access to disconnect them from the redundant AC-power switch while it is in the rack, but often it is more convenient to leave them attached and remove them with the redundant AC-power switch.
3. Remove the one or two redundant AC-power switches to 2145 UPS-1U power cables from the redundant AC-power switch. There is no need to disconnect them from the 2145 UPS-1U .
4. Remove the four screws that hold the redundant AC-power switch in the rack. Be careful to support the redundant AC-power switch during this procedure because the screws are the only support for the unit.
5. The redundant AC-power switch can be slid out of the rack along with the input-power cables if they are still attached.