Mds Qantel Corporation

Veritas Software Corporation

Fletcher M Glenn, Ii

Gabor Fencsik

Bruce D Parker

James A Fosse

The present invention is directed toward a system and method for server back-up. A set of Primary servers and at least on secondary server is coupled to a set of networks. Each server has a host file module for assigning it a common node name and a unique node name. Each server has a high availability module for transmitting a server status over a network. The primary servers each have a set of services operating on their respective networks. The secondary server has a duplicate set of each service running on each primary server. Upon detecting a primary server status which indicates that a primary server is inoperative, the secondary server starts the duplicate set of the primary set of services corresponding to the now inoperative primary server.

System and method for 'N' primary servers to fail over to '1' secondary

Interface unit for handling translation of message signals between a communication channel and a communications processor. The processor and interface unit are embodied in a data processing station of which a plurality of such stations are arranged along the communication channel. The interface unit includes a microstate machine which under program control directs the operations of message transmission, message receipt, and communication channel contention.

Communication channel interface unit

An all digital method and apparatus for recovering NRZ information from MFM data wherein the MFM pulse stream is monitored through hypothetical windows, the receipt of a pulse during a particular window providing information about the data state(s) represented by the pulse and tracking adjustments required to recover subsequent pulses, and further wherein each window is divided into a large number of subinterval's so that the coincidence of a pulse with a particular subinterval provides information about the amount and direction by which the position of subsequent windows should be changed for tracking correction; the windows and subintervals being implemented by the execution of one of a number of step sequences, the particular step sequence being executed indicating the classification of a pulse received during the particular step sequence, and the step being executed at the time of receipt of the pulse indicating required tracking adjustments.

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Danville, CA, United States of America

Fletcher M Glenn, Ii