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............ -o~ Mu9. 1,90 1~:29 P..02 DAVID M. GRIFFITH AND ASSOCIATES, LTl). PROFESSIONAL SERVICES TO THE PUBLIC SECTOR 1100 LOGGER COURT, SUITE D- I00 RALEIGH, NORTH CAROLINA 27609 (919) 876-804? - FAX (919) 878.a592 August 1, 1990 Mr. Richard Russell, Director MIS Depart,riehl Cabarrus County Courthouse, Box 707 Concord, North Carolina 28025 Re: Interim CPU BillingRate Dear Rick: The following rate recommendation is made concerning CPU usage. DMG has identified the annual cost of CPU operations based on FY 91 budgeted expenditures at $617.649 (page 10 of our report). These ar, numerous billing algorithms in both the public and prlvat¢ sector which capture data on system resource utilization. Some rates combine all phases and resource usage into a combined single-rate b[lling. Others {solute specific aspects of cost and gener- ate multiple billings for resource usage (e.g., separate charges for connect time, memory storage, central processor usage, em). The methodologies vazy widely, but all of them have a common bottom line intent which is to effect a proration of total costs to specific users based on actual collective sy.qcm utilization. Actual use will be a relatively small fraction of maximum available use considering the number of available hours of operation factored by 3,600 seconds per hour, For example, the State Computer Center which operates 24 hours daily presently charges S15.30 per minute of CPU, translating to $.25.5 per second. As you know, the large volume of usage demand upon the state computer ~nter results in a much higher percent of available resources actually being utilized than would occur in a county MIS operation which dramatically affects rates. As you also know, it is common for county MIS operations to charge a rate in the arcs of $.50 pet CPU second.