Suspending operations on the active or alternate subsystem
Do not suspend operations on or stop the z/OS® system on which the active subsystem is running without first disabling surveillance, unless you want to initiate an XRF takeover.
Recommendation: Do not suspend operations
on or stop the z/OS system
on which the alternate subsystem is running without first disabling
surveillance and stopping the active subsystem. If you do, the alternate
subsystem could interfere with the performance of the active subsystem
when you restart the alternate subsystem because it tries to reflect
the changes that occurred on the active subsystem in the meantime.