5. OPERATION › 5.1 Operation Overview › 5.1.3 VSAM/ICF Catalog Scan Overview › 5.1.3.5 VCCVVDS--ICF/VSAM Volume Data Set Scan

5.1.3.5 VCCVVDS--ICF/VSAM Volume Data Set Scan

The VCCVSCAN calls the VCCVVDS module to scan an ICF VSAM
Volume Data Set (VVDS).  The VVDS contains device level
information about VSAM data sets that reside on the volume
that contains the VVDS.  The VVDS is pointed to by up to 36
BCSs that have VSAM data sets on this volume defined in them.
The VCCVVDS module performs the following functions:

    o  Sequentially reads the VVDS and generates VCC VSAM
       data set SMF records for every VSAM data set described
       by the VVDS.  This information includes:

         - The VSAM data set name.

         - The name of the BCS in which the data set is
           defined.

         - The detailed extents of each data set that is on
           the device on which the VVDS resides.  Note that a
           VSAM data set may spread across a number of
           volumes.  This means that there is an SMF record
           generated for every volume on which the data set
           resides, as well as another record that is
           generated when the data set is encountered in a
           BCS.  The CA MICS VCA component later combines
           this information into one observation for the data
           set.