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The NASA/Houston Mass Data Storage Facility (MDSF) is a multi-computer system providing data storage and retrieval services to the Real Time Computer Complex (RTCC) of the NASA Mission Control Center in support of the Skylab program. A large scale simulation model of the MDSF has been developed. There are two major areas of use for this model. One is concerned with determining how to use the present MDSF most effectively in accomplishing its current applications. Here, use of the model includes studies of data structuring and allocation alternatives, scheduling techniques, application program organization, system configurations, and so forth. The second major area of use is concerned with analyses of potential MDSF hardware and software design changes. This paper begins with an overview of the structure and facilities of the model. The methods employed in the internal and external design of the model to meet the wide range of requirements for its use are described, and the problems of developing large scale computer system simulation models are discussed.