DASD Billing

This CA Disk facility provides billing capabilities for the space occupied by non-VSAM data sets and VSAM clusters on DASD. Periodic VTOC scans are made to determine the space occupied by each individual data set. Assigned billing rates are then applied and accumulated. The VTOC scans can be run as frequently as desired. Each run's billing amount is based on current space occupancy assumed to have existed over the period since the previous scan.

The CA Disk DASD Space Billing function accumulates a billing charge against each data set based on two criteria:

The SPACE OCCUPIED by (allocated to) each data set.
The NUMBER OF DAYS it occupies that space.

The product of these two values provides a billing quantity in either TRACKDAYS or KILOBYTE-DAYS. The user must supply the billing rate for either one track-day or one kilobyte-day of occupancy. A simple multiplication of the billing quantity times the billing rate yields the billing charge for each data set.

For example, a two-track data set residing on DASD for 50 days provides a 100 track-day billing quantity. If the billing rate is one cent per track per day, the charge for this period is one dollar.

To find the space occupied by each data set (item 1 above), periodic VTOC scans are made and space allocations calculated.

There are two methods available to determine the days of occupancy for data sets. They are referred to as MODE=ELAPSED and MODE=IMMEDIATE.