Abstract: This file server system appears to the host computer to be a plurality of data storage devices which are directly addressable by the host computer using the native data management and access structures of the host computer. The file server however is an intelligent data storage subsystem that defines, manages and accesses synchronized sets of data and maintains these synchronized sets of data external from the host computer system's data management facilities in a manner that is completely transparent to the host computer. This is accomplished by the use of the snapshot application data group that extends the traditional sequential data set processing concept of generation data groups.

Abstract: The intelligent storage manager includes a number of data bases which are used by the expert system software to manage the computer system data storage devices. One element provided in this apparatus is a set of data storage device configuration data that provides a description of the various data storage devices and their interconnection in the computer system. A second element is a knowledge data base that includes a set of functional rules that describe the data storage device management function. These rules indicate the operational characteristics of the various data storage devices and the steps that need to be taken to provide the various functions required to improve the performance of the computer system memory. In addition, various mathematical models are used to determine data relating to the operation of the data storage devices. These models not only assist in the identification of conflicts, but are also used to predict the effect of proposed conflict solutions.