5. FILES › 5.2 VTOC/Catalog Activity Information Area Files › 5.2.3 Volume Allocation File (VCAVOA)

5.2.3 Volume Allocation File (VCAVOA)

The Volume Allocation File describes a variety of attributes
for each DASD volume scanned by VCC.

Besides the importance of the volume-level statistics kept in
the VCAVOA observations, the VCAVOA file is used in a match
MERGE operation with both the VCADAA file and the VCA_VS file
in the DAILY run.

The absence of a VCAVOA observation for a data set on a given
VOLSER indicates a problem during data collection.  VCC
accumulates volume-level statistics while reading the VTOC of
a volume.  When "end-of-VTOC" is reached, a volume level
record is written out by VCC.  This volume level record
(documented in the CA MICS Space Collector Guide) is
transformed into a VCAVOA (SAS) observation.  Another data
step combines calculated VSAM-related totals from WORK
versions of the VCA_VS file to develop the final DETAIL level
observation for the VCAVOA file.

If there is not a matching VCAVOA observation for a set of
VCADAA observations with a given VOLSER, then all the VCADAA
observations for that VOLSER are purged (not written to the
VCADAA file).  The absence of a VCAVOA observation indicates
partial data collection for that scan time (ENDTS) and a
report is produced on MICSLOG (see Appendix A - Messages).

The following sections describe the file's organization, list
the data elements maintained, and provide usage hints.

    1 - VCAVOA File Organization
    2 - VCAVOA Data Elements List
    3 - VCAVOA Usage Considerations
    4 - VCAVOA Retrieval Examples