WO1998027506A3 - Ndc consistency reconnect mechanism - Google Patents

Ndc consistency reconnect mechanism Download PDF

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Publication number
WO1998027506A3
WO1998027506A3 PCT/US1997/023386 US9723386W WO9827506A3 WO 1998027506 A3 WO1998027506 A3 WO 1998027506A3 US 9723386 W US9723386 W US 9723386W WO 9827506 A3 WO9827506 A3 WO 9827506A3
Authority
WO
WIPO (PCT)
Prior art keywords
file
site
server
image
caching
Prior art date
Application number
PCT/US1997/023386
Other languages
French (fr)
Other versions
WO1998027506A2 (en
Inventor
William M Pitts
Original Assignee
Inca Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Inca Technology Inc filed Critical Inca Technology Inc
Publication of WO1998027506A2 publication Critical patent/WO1998027506A2/en
Publication of WO1998027506A3 publication Critical patent/WO1998027506A3/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/02—Addressing or allocation; Relocation
    • G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
    • G06F12/0802—Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches
    • G06F12/0806—Multiuser, multiprocessor or multiprocessing cache systems
    • G06F12/0813—Multiuser, multiprocessor or multiprocessing cache systems with a network or matrix configuration
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/10—File systems; File servers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99951—File or database maintenance
    • Y10S707/99952—Coherency, e.g. same view to multiple users
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99951—File or database maintenance
    • Y10S707/99952—Coherency, e.g. same view to multiple users
    • Y10S707/99953—Recoverability

Abstract

A client (24) in a digital computer network that employs server-driven consistency accesses a file (26) that a caching site (22) supplies from an image of the file (26) projected from a server (28). When the file (26) becomes inactive, the site (22) saves the file onto local permanent storage together with file metadata. A subsequent request to the site (22) to access the file (26) retrieves from local storage the metadata, including a file-last-write-time attribute. The caching site (22) compares the locally retrieved file-last-write-time attribute with a server supplied file-last-write-time attribute. If the two attributes are identical, then the caching site: 1. reconnects to the projected file image present in storage at the site (22); 2. re-establishes server-driven consistency over the projected file image at the caching site (22); and 3. uses data from the file image retrieved from local storage to respond to a subsequent read request from the client (24).
PCT/US1997/023386 1996-12-17 1997-12-16 Ndc consistency reconnect mechanism WO1998027506A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US3346296P 1996-12-17 1996-12-17
US60/033,462 1996-12-17

Publications (2)

Publication Number Publication Date
WO1998027506A2 WO1998027506A2 (en) 1998-06-25
WO1998027506A3 true WO1998027506A3 (en) 1998-10-15

Family

ID=21870548

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/023386 WO1998027506A2 (en) 1996-12-17 1997-12-16 Ndc consistency reconnect mechanism

Country Status (2)

Country Link
US (1) US5946690A (en)
WO (1) WO1998027506A2 (en)

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Publication number Publication date
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US5946690A (en) 1999-08-31

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