Xerox Corporation

Christopher Comparetta

Ronald A Ippolito

Kitty Sathi

Colleen R Enzien

Anthony M Federico

Ernest L Legg

Randall J Stegbauer

Jack T Latone

Mark A Smith

Jeff C Carter

Kim P Ciulla

Keith A May

Thomas M Frey

Atashi C Sonty

Lyssa E Menard

Alan W Willett

Jose A Faria

In a process for ensuring compatibility of components in a system, system components are defined and relationships between two or more system components identified. From relationships between components, inter-relationships between these identified relationships and possibly other components are determined. By validating integrity of either or both of the identified relationship and determined inter-relationship and, based on a validating result, ensuring integrity of the identified relationship or determined inter-relationship, compatibility of the components in the system is ensured. This process is particularly useful in eliminating incompatibilities between resident and migrational software in an automated computer system.

Process for configuration management

An electronic image processing apparatus comprising an electronic scanner and an electronic printer for forming an image, a controller for directing the operation of the image processing means, the controller including a mass memory device for storing data to be printed, random access memory, a printer control, and a Resource Manager for ensuring access to the random access memory for conveying data from the mass memory device to the printer via the random access memory, the Resource Manager including a mass memory device scheduler to provide printer access to the random access memory, the mass memory device scheduler having a reservation queue to reserve mass memory device access at predetermined times, delay means to determine that access to the mass memory device is invalid within a given time, and means to convey disk request operations to said reservation queue in order to provide guaranteed random access mernory at predetermined times.

Scheduling multiple disk requests and writing data buffers to disk

In accordance with the present invention there is provided a method for scheduling transfers in a printing machine of the type having a scheduler communicating with both a first disk and a second disk, the first and second disks having a combined bandwidth. The method for scheduling comprises the following steps: First, a first transfer to be performed on a first location of the first disk during a first time interval and a second transfer to be performed on a second location of the first disk during a second time interval are both scheduled, with the scheduler, so that a first time gap interval exists between the first time interval and the second time interval. Second, a third transfer to be performed on a first location of the second disk during a third time interval and a fourth transfer to be performed on a second location of the second disk during a fourth time interval are both scheduled, with the scheduler, so that a second time gap interval exists between the third time interval and the fourth time interval. Finally, a fifth transfer to be performed during a fifth interval is scheduled, with the scheduler, so that the fifth interval occurs during either the first time gap interval or the second time gap interval in a manner that maximizes the combined bandwidth of the first and second disks.

Dispatching and scheduling memory operations in an electronic printing

An electronic printing system with plural hard disks for storing system files with booting process for booting the system to a running condition, the booting process detecting a previously replaced or misplaced disk and in response thereto, enabling booting of the system without loss or re-installing of critical system files.

Process for replacing storage media in electronic printing systems

An electronic printing system with plural hard disks for storing system files in which upgraded software together with software identification data is written to a first of the disks, the system booted from the first disk, and the upgraded software thereafter migrated from the first disks to the other disks.

Process for automatically migrating a subset of updated files from the

An electronic image processing apparatus having image processing resources including a controller for directing the operation of the image processing resources, the controller including a disk memory, the method of controlling mass memory device bandwidth access during an access time window including guaranteeing access to the memory for predetermined time periods for a first set of image processing resources during each access time window, a second set of image processing resources having access subordinate to the first set of image processing resources, maintaining a record of mass memory device access for the first set of image processing resources during each access time window, receiving a memory access request from the first set of image processing resources, determining that said resource utilization does not exceed the predetermined time period, and allowing current access to the mass memory device by the image processing resource. The second set of image processing resources achieves access upon determination that none of the first set of resources is requesting access or upon determination that each of the first set of resources has exceeded the predetermined time period.

Disk bandwidth allocations to prioritize disk requests

A multiprocessor control for a machine including a first executing portion communicating with a first processor and a second executing portion communicating with a second processor. The processors execute a plurality of tasks with each of said tasks residing in one or the other of the processors. Each of the tasks is executed in one or the other of the processors and each of the tasks comprises a block of instructions. A plurality of tasks are operated on by providing a start instruction for the execution of tasks, identifying a first task to be started by said start instruction, initiating the execution of the first task by the start instruction, identifying a second task to be started by the start instruction, and initiating the execution of the second task by the start instruction before the execution of the first task is complete.

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Pittsford, NY, United States of America

Christopher Comparetta