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:
May. 03, 1994
Filed:
Aug. 12, 1992
Applicant:
Inventors:
Assignee:
Digital Equipment Corporation, Maynard, MA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
371 404 ; 371 101 ; 395425 ;
Abstract
A method for prefetching the data and parity blocks for generating parity data of a stripe. The method uses a low and high thresholds marker indicative of a first and second level of fullness of the cache to determine whether or not to prefetch the data and parity blocks. If the cache is filled to a level exceeding the first level of fullness, the data and parity blocks are prefetched for any blocks to be written to the disk drive between the low and high threshold. The data and parity blocks are read from the disk drive at a lower processing priority in anticipation of the writing of the block.