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:
Aug. 31, 2004
Filed:
Nov. 30, 2000
Pat Allen Buckland, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method and system for managing data in a data processing system are disclosed. Initially, data is stored in a first portion of the main memory of the system. Responsive to storing the data in the first portion of main memory, information is then stored in a second portion of the main memory. The information stored in the second portion of main memory is indicative of the data stored in the first portion. In an embodiment in which the data processing system is implemented as a multi-node system such as a NUMA system, the first portion of the main memory is in the main memory of a first node of system and the second portion of the main memory is in the main memory of a second node of the system. In one embodiment, storing information in the second portion of the main memory is achieved by storing a copy of the data in the second portion. If a fault in the first portion of the main memory is detected, the information in the second main memory portion is retrieved and stored to a persistent storage device. In another embodiment, storing information in the second portion of the main memory includes calculating a value based on the corresponding contents of other portions of the main memory using an algorithm such as checksum, parity, or ECC, and storing the calculated value in the second portion. In one embodiment, the main memory of at least one of the nodes is connectable to a persistent source of power, such as a battery, such that the main memory contents may be preserved if system power is disabled.