OS/390 V2R10.0 JES2 Initialization and Tuning Guide: Section 3.1 - Spool Volume Configuration, Control, and Performance, at http://publibfp.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/has1a330/3.1
or
OS/390 V2R10.0 JES3 Initialization and Tuning Guide: Section 6.1 - Defining and Managing Spool Data Sets, at http://publibfp.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/iat1a640/6.1.