How does SOLVE use the file ?
VFS (Virtual File System) The VSAM data set used as a database to configure a region.
It is the data set used by the region for internal processing activities and as a general database for use by the various products. The VFS is a database used to store many record types and must not be shared across regions.
Region customization parameters are stored in VFS data set.
Type: Local VSAM
Run-time DDName: VFS.