2. COST ACCOUNTING CONCEPTS FOR IS ORGANIZATIONS › 2.7 DASD/DFHSM/SMS Storage Accounting › 2.7.7 DASD Accounting Features

2.7.7 DASD Accounting Features

This section summarizes CA MICS Accounting and Chargeback
support for data sets that reside on active DASD volumes
(primary storage), for data sets that have been migrated to
migration levels 1 or 2 by DFHSM, and for backup versions.

This support allows you to implement the rate pyramid shown
in Section 2.7.4.


CHARGING FOR ACTIVE DATA SETS ON PRIMARY STORAGE

CA MICS Accounting and Chargeback supports both SMS and
traditional device dependent algorithms for DASD charging.
This allows you to charge your SMS data sets by Storage Class
and Management Class while you continue to charge your non-
SMS data sets by device dependent measurements.

If you are currently using traditional algorithms to charge
for SMS data sets, you can continue to do so, or you can
implement Storage Class and Management Class algorithms for
your SMS data sets without affecting the charges for non-SMS
data sets.

CA MICS Accounting and Chargeback also supports VSAM
accounting from either the VTOC or ICF catalog.

This support is provided by the use of three journal files,
each with corresponding invoice categories and computation
codes:

o  The ACTJDA journal file is used for charging non-SMS data
   sets, both VSAM and non-VSAM, based on VTOC information.

o  The ACTJMS journal file is used for charging SMS data sets
   by Storage Class and Management Class algorithms.

o  The ACTJVS journal file can be used to charge VSAM data
   sets based on the ICF catalog, but this approach is not
   recommended.

CHARGING FOR MIGRATED DATA SETS

CA MICS Accounting and Chargeback supports charging for
migrated data sets with the ACTJMG Migrated Data Journal
file.  This journal file is derived from the HSMMIG file and
contains information on migrated data sets from the DFHSM
Migration Control Data Set (MCDS).

The ACTJMG journal file allows you to charge different rates
for data sets based on the migration level of the data, level
1 or 2.

You can also charge different rates based on the SMS
Management Class value.


CHARGING FOR BACKUP VERSIONS

CA MICS Accounting and Chargeback supports charging for
backup versions of data sets via the ACTJBC Backup Data
Journal file.  This journal file is derived from the HSBBAC
file and contains information on backup versions of data sets
from the DFHSM Backup Control Data Set (BCDS).

The SMS Management Class is often used to indicate the backup
frequency of the data set and the number of backup versions
that must be kept.  Because data sets that are backed up more
frequently, or require an extensive number of backup copies
require more space and thus have a higher cost than do those
with less stringent requirements, the ACTJBC journal file
allows you to charge different rates for data sets based on
the SMS Management Class value.

NOTE:  An alternate approach to using the ACTJBC journal file
       to charge for backup versions of data sets would be to
       have proportional rates for data sets on primary
       storage based on their backup requirements (frequency
       and number of versions kept).  Since the size of the
       backup versions will be proportional to the size of
       the data set on primary storage, if you charge for
       megabyte hours based on Management Class, and if you
       can identify the data set's backup requirements based
       on its Management Class value, this should provide a
       reasonable approximation of its backup costs.