A VARY command requested that a device be placed online or offline. The device specified on the command is presently in use by a system component and cannot be made available or unavailable to the system until the system component is finished using the device.
The system rejects the command.
Enter the command again when the system component has finished processing.
Master scheduler
IEECB838, IEECB839, IEECB840, IEECB844, IEECB850
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5