Bull Hn Information Systems, Inc.

Arnold S Lipton

David A Egolf

Todd Bradley Kneisel

Michael L Giroux

Mariam P Sanford

David W Wagner

A method for addressing mass memory in which information is stored in control intervals of physically contiguous disk segments subject to irregularities in the mapping is disclosed. Such irregularities may include discontinuities at some regular interval, which may or may not be 2', and/or offset from zero with respect to a virtual address employed by a user. Within the method, a unique hashing algorithm is employed to convert a virtual address to a physical address taking into account such irregularities in the mapping. This algorithm is particularly characterized by its use of integer binary arithmetic which results in high speed and complete accuracy. For the special and common condition in which discontinuities appearing at some regular interval of 2', a similar disclosed algorithm may be employed to achieve even greater speed of address transformation.

Method for transforming a hash bucket number to a control interval to

In order to provide the facility in an information processing system to analyze system faults which result in the setting of one or more flags, a logic equation fault analyzer utility program is used. In the exemplary implementation, the fault flags are the symbols, and the combinations of symbols which make up a specific fault event can be expressed in terms of a logic equation. A logic equation is written for each of all known fault events which may occur in a given system, and these logic equations are placed in a table on a prioritized basis. It will then be the responsibility of the logic equation fault analyzer to identify the first equation in the table which matches the input symbols. In addition the logic equation fault analyzer must identify those symbols which are not part of the equation so that these symbols may be analyzed separately at a later time.

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Phoenix, AZ, United States of America

Arnold S Lipton