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:
Dec. 06, 1994
Filed:
Sep. 04, 1991
Applicant:
Inventors:
Thomas E Idleman, Santa Clara, CA (US);
Jesse I Stamness, Sunnyvale, CA (US);
Assignee:
Unisys Corporation, Blue Bell, PA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ;
U.S. Cl.
CPC ...
395250 ; 395425 ; 395275 ; 3642434 ; 3649642 ;
Abstract
In a data processing system communicating with disc drives via a disk channel, a disc cache subsystem coupled between the outboard side of the channel and the disc drives. The disc cache subsystem includes a plural-level cache memory comprised of a first memory and a second memory, wherein the first memory serves as input/output storage for the second memory. Provision is also made for controlling which of a plurality of disc drives is to be subject to caching by controlling which drives are to be bypassed.