I ve read in a link abt Catalog - Volume ownership, It says
Catalog - Volume Ownership
When a given direct access storage volume contains a VSAM catalog (either the master catalog or a user catalog), the catalog must be the first VSAM object stored on that volume. A VSAM catalog owns the volume on which it resides. All the VSAM objects that are defined on a volume containing a VSAM catalog must be cataloged in the catalog residing on that volume. A catalog can also own other volumes; however, those volumes cannot also contain other VSAM catalogs. When the first VSAM object on a volume that does not contain a VSAM catalog is defined, that volume becomes the property of the catalog that contains its catalog entry.
I want some clarification on this topic.. u can ve look at this link also http://www.jaymoseley.com/hercules/vstutor/vstutor.htm