IEF464I

Explanation
The DD statement requested a specific device. The
system could not allocate the device, because some earlier processing
(hot I/O processing or VARY dev,OFFLINE,FORCE command
processing, for example) boxed the device.
When a device is
boxed, these events occur:
I/O on the device ends.
Any new I/O requests result in permanent I/O errors.
No new allocations are done for the device.
If the device was online, it is marked pending offline. The device
goes offline when these conditions occur, in this order: The device is no longer allocated to any job.
Allocation can get the necessary resources to process the request.If
the device was offline, it remains offline.

In the message text: jobname
The name of the job.
procstep
The name of the step in the procedure.
stepname
The name of the job step.
ddname
The name of the DD statement.
+ xxx
The relative position of a data set within a concatenation of
data sets, including all data sets implicitly concatenated (through
GDG ALL or OPTCD=B requests). See z/OS MVS JCL User's Guide for
more information on GDG ALL or OPTCD=B requests when used within a
set of concatenated data sets. The first data set of a concatenation
would be +000, but the value +000 is never shown.

System action
The system ends the job.

Programmer response
Resubmit the job when the device has been
brought back online.

Source
Allocation

Module
IEFAB4FD

Routing code
11

Descriptor code
-