3. IMPLEMENTATION › 3.1 Strategies for DASD Accounting › 3.1.3 Avoiding VCA Duplicate Charging

3.1.3 Avoiding VCA Duplicate Charging

- Avoiding HSM/VCA Duplicate Charging

Duplicate charging for migrated data sets can occur between
HSM and VCA if Stage 1 migrated data sets reside on the
volumes scanned by the CA MICS Space Collector Option.

If you charge from the HSM Migrated Data Journal File and
also from the VCA DAA or VSAM Resource Journal Files, then
you must take care to avoid duplicate charging.


HOW TO AVOID HSM/VCA DUPLICATE CHARGING

You can prevent HSM migrated data sets from being passed to
the VCA DAA and VSAM Resource Journal Files by specifying NO
for "Pass HSM data to DAA and _VS journal files" in
Accounting Options General Installation Accounting
Specifications and running the ACTXOPTS job.

Display this panel by selecting Option 3;2;1 on the
Installation Accounting Primary Options Menu.

- Avoiding File System Duplicate Charging

The Data Set Allocation (VCADAA) and VSAM Data Set Allocation
(VCA_VS) files contains a single CA MICS observation for each
z/OS data set including UNIX System Services (USS) data sets.
The USS Directory Entry (HFSDIR) file contains a single CA
MICS observation for each directory entry in file system data
sets.  With CA MICS Accounting and Chargeback Option, you can
charge for file system data sets at either the single file
image (VCADAA/VCA_VS) level or the directory entry (DIR)
level.  If you have activated the ACTJHF (HFS Resource)
journal file to charge for file system data sets at the
directory entry level, CA MICS will prevent duplicate
charging from any other VCA files.

    NOTE: Although the CA MICS Accounting and Chargeback
          Option product supports USS file systems data for
          billing, we strongly discourage the use of the
          HFSDIR file for accounting due to the following:

            1)  Only mounted file systems are scanned and
                contribute file information to the HFSDIR
                file.

            2)  The space allocated for individual file(s)
                and/or directory(ies) does not account for
                the unused but allocated space in the file
                system.

            A better alternative for USS file system
            accounting is the VCADAA file.  It contains a
            single record for each USS file system data set
            (both mounted and unmounted) that contains the
            total space allocated to the file system.