In most cases, you should unmount any user-defined file systems before you perform a save or restore operation. Use the DSPUDFS command to determine if you mounted a UDFS or if you unmounted a UDFS.
The server saves objects from an unmounted UDFS if you specify the *BLKSF for the UDFS which is contained in an ASP or independent ASP (/dev/qaspxx). The server saves information about the UDFS (for example, the ASP number, authority, and case sensitivity).
SAV OBJ(('/dev/QASP02/udfs_name.udfs'))