Xerox Corporation

Daniel C Chen

Mark A Smith

Anthony M Federico

Robert S Hamilton

Ronald S Tomory

Sharon Mathiason

A method and apparatus provide for recovering from faults in an electronic reprographic system for scanning and synchronously or asynchronously processing and printing a plurality of jobs. The system is monitored for the occurrence of faults in a job, the faults are identified and recorded through a fault logging service and a specific response is initiated to the faults recorded by the fault logging service. Provision is made for using the log offline to determine the cause and effect of problems created by the faults in the system. The invention further provides for using the log online to monitor the occurrence of hardware faults in the system, and initiate the appropriate online diagnostic routine, whose response can further isolate a suspected problem.

Method and apparatus for recording and diagnosing faults in an

A method for testing and comparing the access times of disk drives in a real time system containing a multiplicity of likes drives. The method includes the steps of generating random locations for each of the drives to access, initializing each of the drives to a common position, determining the time period for each of the drives to find and read the random locations, comparing the differences in the time periods to a threshold value, and declaring a fault upon detecting any of the differences exceeding the said threshold.

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Webster, NY, United States of America

Daniel C Chen