Use the reference numbers in parentheses at the end of each notice, such as (C003) for example, to find
the matching translated notice in IBM Systems Safety Notices.
To remove a redundant ac-power switch, complete the following steps:
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 in the IBM System Storage SAN Volume Controller 2145
Troubleshooting Guide.
a. 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 will lose access to the data that is managed by that I/O group.
b. 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 has recovered and rejoined 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. If you have had to perform this operation, pay particular attention to checking
when it is safe to turn off the second node. See MAP 5350 in the IBM System Storage SAN Volume
Controller 2145 Troubleshooting Guide.
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 will 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.
Replacing the redundant ac-power switch
Use this topic when you need to replace a redundant ac-power switch.
268 IBM SAN Volume Controller Hardware Maintenance Guide
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