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. 06, 1996
Filed:
Dec. 23, 1993
Robert E Swenson, Mendota Heights, MN (US);
Joseph E Kessler, St. Anthony, MN (US);
Unisys Corporation, Blue Bell, PA (US);
Abstract
An outboard file cache system including file surge protection and an improved method for managing allocation of cache storage are disclosed. In an outboard cache, excessive writes to a file are detected by testing whether a segment belonging to a file specified by a nd, which logically precedes one of the segments specified in the command by a predetermined number of segments, is present in the outboard file cache, has been written, and has not been destaged. When a first surge-threshold is reached, a group of segments is selected and destaged. When a second surge-threshold is reached, the outboard cache inhibits allocation of further cache storage for the file for the purpose of writing until a selected group of segments is destaged.