IDC21805I

Explanation
The specified volume was selected for processing
but extracted information was insufficient to continue processing.
In
the message text: volser
The volume serial number.

System action
Processing continues with the next volume.

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, the SYSOUT output for the job, and all printed
output and output data sets related to the problem.

Programmer response
Ensure that the user control block (UCB)
for this volume is valid.

Source
DFSMSdfp