Use to specify the volume or portion of a storage device to be used by msys for Setup when dynamically creating data sets. The combination of the volume serial and the high level qualifier indicate the exact location for msys for Setup to use for the dynamically created data sets.
Rules:
The maximum length is six characters.
All characters must be either alphanumeric or national (A to Z, 0 to 9, $, @, or #).
The default will be NULL, which allows for the possibility of creating the data sets on a nonspecific volume if your system is setup to allow for nonspecific volume requests.