IGD17281I

Explanation
Volume(s) were explicitly specified for a guaranteed
space request but one or more of these volumes was rejected. There
may be another message that indicates which volume was rejected and
for what reason. No message is issued if the reason for rejection
was lack of space.
In the message text: dsname
The The data set name
vol
The volume serial number that was rejected

System action
The SMS VTOC Data Set Services request fails.

Programmer response
Replace the rejected volume with another
volume and rerun the job.

Source
Data Facility Product (DFSMS)