DFS3892 WAITING FOR I/O PREVENTION TO COMPLETE

Explanation
 Takeover by the alternate system cannot proceed
until  I/O prevention on the active system has completed.

System action
 The alternate system is waiting to be notified
that I/O prevention is complete in the active system: either the response /UNLOCK to
message AVM005A or the /UNLOCK SYSTEM command
from the alternate system Master Terminal Operator (MTO).

Operator response
(master terminal)  Make sure that the
failing system can no longer generate I/O requests. When this is true,
the alternate system MTO can either enter the /UNLOCK SYSTEM command
or reply /UNLOCK to the MVS AVM
message to allow takeover to proceed.

Programmer response
 No action is required.