IEF148I

Explanation
The allocation request failed because the System
Programmer marked the required tape device as unavailable to allocation
by the VARY xxx,UNAVAILABLE command
If a VARY ONLINE or VARY
AVAILABLE command was done while the job was in allocation, any new
devices made available by the command are not available to the job,
because jobs in the recovery allocation are still locked onto the
Eligible Device Table (EDT) as existed at the start of device allocation
processing. The newly available device does not become available until
the job ends, or is cancelled, then is submitted again.
In the
message text: first five variables
See IEF702I for documentation.

System action
System processing continues.

Operator response
None

System programmer response
None

Problem determination
The display units command (D U,,,devnum,1)
can be used to determine the status of the device as coded in the
JCL or dynamic allocation request. If the JCL or dynamic allocation
request cannot be updated to request a different device number, the
VARY ONLINE or VARY AVAILABLE commands can be used to change the device’s
status and make it available for Allocation. D U,TAPE,OFFLINE will
show all tape offline devices so that a different device can be determined.

Source
MVS™ Device Allocation

Module
IEFAB424

Routing code
1

Descriptor code
11