1995-08-14
1997-11-04
Beausoliel, Jr., Robert W.
39518505, G06F 1100
Patent
active
056849443
ABSTRACT:
A method for atomically updating Error Detection Code (EDC) protected data in memory such that the EDC protection is maintained to the granularity of a single microprocessor machine instruction. The method is employed in a memory system having a volatile storage area and at least one nonvolatile storage area, each of the storage areas storing a copy of the protected data and two copies of its associated error detection code. The volatile and nonvolatile storage areas each have a first storage location for storing one of the copies of the associated error code and a second storage location for storing the other of the copies of the associated error code. In such a system, a chosen field with the data structure in the volatile copy is updated. Once the volatile copy is updated, a new error detection code is computed with the data in the volatile copy. The new error detection code is then written to the first storage location in each of the storage areas, volatile and nonvolatile, one at a time. Once the copies have been written with the new EDC, the chosen field of the data structure within the nonvolatile copy is updated. Lastly, the new error code is written to the second storage location in each of the updated storage areas.
REFERENCES:
patent: 4339804 (1982-07-01), Davison et al.
patent: 4958273 (1990-09-01), Anderson et al.
patent: 5177744 (1993-01-01), Cesare et al.
patent: 5201044 (1993-04-01), Frey, Jr. et al.
patent: 5375128 (1994-12-01), Menon et al.
patent: 5379417 (1995-01-01), Lui et al.
patent: 5396620 (1995-03-01), Burghart et al.
patent: 5402428 (1995-03-01), Kakuta et al.
patent: 5418921 (1995-05-01), Cortney et al.
patent: 5428630 (1995-06-01), Weng et al.
patent: 5497457 (1996-03-01), Ford
patent: 5502836 (1996-03-01), Hale et al.
patent: 5504857 (1996-04-01), Baird et al.
Antoine N. Mourad, W. Kent Fuchs, and Daniel G. Saab, "Recovery Issues in Databases Using Redundant Disk Arrays", Journal of Parallel and Distributed Computing, vol. 17, Jan./Feb. 1993, No. 1/2, pp. 75-89.
IBM Technical Disclosure Bulletin, "Preventing Data Loss on Power Off of Exposed Redundant Array of Independent Disks Box", vol. 37, No. 10, Oct. 1, 1994, p. 673.
Elkington Susan G.
Lubbers Clark E.
Beausoliel, Jr. Robert W.
Hudgens Ronald C.
Palys Joseph E.
Peterson Cathy L.
LandOfFree
Atomic update of EDC protected data does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Atomic update of EDC protected data, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Atomic update of EDC protected data will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1840723