The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 20, 2005
Filed:
Jan. 31, 2002
Thomas J. Kondo, Santa Clara, CA (US);
James S. Klecka, Georgetown, TX (US);
Robert L. Jardine, Cupertino, CA (US);
William P. Bunton, Pflugerville, TX (US);
Graham B. Stott, Dublin, CA (US);
Thomas J. Kondo, Santa Clara, CA (US);
James S. Klecka, Georgetown, TX (US);
Robert L. Jardine, Cupertino, CA (US);
William P. Bunton, Pflugerville, TX (US);
Graham B. Stott, Dublin, CA (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
A computer system includes a primary processor and a secondary processor running in lockstep. The lockstep may or may not be synchronous. Errors occurring in the primary processor or the secondary processor are reported to an error-handling module. If the error is a recoverable error, the state of one of the processors is saved and the processors are restarted using the saved state. In addition to the reporting of errors from the processors, cross checking of the operation of the processors is performed to detect a divergence in the operation of the processors. If the divergence is reported to be due to a recoverable error, the state of the one of the processors is saved and the processors are restarted using the saved state. Procedures are also disclosed to ensure that data corruption does not propagate onto an associated network, and to ensure that the system is not lost as a network resource during processor restart.