If APAR WI2229 is installed, there is no need to disconnect the IOA subsystem during fallback. Otherwise, any fallback of a component that uses the IOA subsystem requires you to disconnect the IOA subsystem and restart the other components.
Use the following command when it is necessary to disconnect the IOA subsystem:
S IOASDISC,SSNAME=ioa_subsystem
IOASDISC is release-independent.
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