IDC2915I ** UNABLE TO MOUNT VOLUME `ser`

Explanation
An appropriate unit was not available for mounting,
or JES3 will not permit the volume to be mounted.
In the message
text: 
ser

The volume serial number.

System action
The data set is not scratched.

System programmer response
If the error recurs and the program
is not in error, look at the messages in the job log for more information.
Search problem reporting data bases for a fix for the problem. If
no fix exists, contact the IBM® Support
Center. Provide the JCL and the SYSOUT output for the job.

Programmer response
Ensure that a unit is available for mounting.

Source
DFSMSdfp

Module
IDCSA08

IDC2915I ** UNABLE TO MOUNT VOLUME ser

Explanation

System action

System programmer response

Programmer response

Source

Module

IDC2915I ** UNABLE TO MOUNT VOLUME `ser`