5. OPERATION › 5.1 Operation Overview › 5.1.2 VTOC Scan Overview › 5.1.2.2 VCCCVAF--Indexed VTOC Information Retrieval

5.1.2.2 VCCCVAF--Indexed VTOC Information Retrieval

The VCCVTOC module calls the VCCCVAF module and it retrieves
information from the VTOC Index that it needs to properly set
up the scan of the main VTOC.  VCCCVAF uses the Common VTOC
Access Facility (CVAF) to obtain the following information:

    o  The number of free DSCBs in the VTOC.

    o  Detailed free space extent information.  It uses this
       information to build the volume free space segments
       for the VCC VTOC SMF record.  VCCCVAF will return only
       255 free space extents in one call (CVAF restriction),
       and will notify the caller via a return code if more
       free space extents exist.  The caller will then
       continue calling VCCCVAF until all the extents are
       received.