WO2002029572A3 - Recovery of file system data in file servers mirrored file system volumes - Google Patents

Recovery of file system data in file servers mirrored file system volumes Download PDF

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Publication number
WO2002029572A3
WO2002029572A3 PCT/US2001/031422 US0131422W WO0229572A3 WO 2002029572 A3 WO2002029572 A3 WO 2002029572A3 US 0131422 W US0131422 W US 0131422W WO 0229572 A3 WO0229572 A3 WO 0229572A3
Authority
WO
WIPO (PCT)
Prior art keywords
mirrored
file system
file
date
volumes
Prior art date
Application number
PCT/US2001/031422
Other languages
French (fr)
Other versions
WO2002029572B1 (en
WO2002029572A2 (en
WO2002029572A8 (en
WO2002029572A9 (en
Inventor
Srinivasan Viswanathan
Steven R Kleiman
Original Assignee
Network Appliance 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 Network Appliance Inc filed Critical Network Appliance Inc
Priority to EP01979574A priority Critical patent/EP1325415B1/en
Priority to DE60112462T priority patent/DE60112462T2/en
Publication of WO2002029572A2 publication Critical patent/WO2002029572A2/en
Publication of WO2002029572A8 publication Critical patent/WO2002029572A8/en
Publication of WO2002029572A3 publication Critical patent/WO2002029572A3/en
Publication of WO2002029572B1 publication Critical patent/WO2002029572B1/en
Publication of WO2002029572A9 publication Critical patent/WO2002029572A9/en

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16—Error detection or correction of the data by redundancy in hardware
    • G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
    • G06F11/2053—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where persistent mass storage functionality or persistent mass storage control functionality is redundant
    • G06F11/2056—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where persistent mass storage functionality or persistent mass storage control functionality is redundant by mirroring
    • G06F11/2082—Data synchronisation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16—Error detection or correction of the data by redundancy in hardware
    • G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
    • G06F11/2053—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where persistent mass storage functionality or persistent mass storage control functionality is redundant
    • G06F11/2056—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where persistent mass storage functionality or persistent mass storage control functionality is redundant by mirroring
    • G06F11/2064—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where persistent mass storage functionality or persistent mass storage control functionality is redundant by mirroring while ensuring consistency
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00—Error detection; Error correction; Monitoring
    • G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/14—Error detection or correction of the data by redundancy in operation
    • G06F11/1402—Saving, restoring, recovering or retrying
    • G06F11/1471—Saving, restoring, recovering or retrying involving logging of persistent data for recovery
    • 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
    • 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
    • Y10S707/99955—Archiving or backup

Abstract

The invention provides a method and system for recovery of file system data in file servers having mirrored file system volumes. The invention makes use of a 'snapshot' feature of a robust file system (the 'WAFL File System) to rapidly determine which of two or more mirrored volumes is most up-to-date, and which file blocks of the most recent mirrored volume have been changed from each one of the mirrored file systems. In a preferred embodiment, among a plurality of mirrored volumes, the invention rapidly determines which is the most up-to-date by examining a consistency point number maintained by the WAFL File System at each mirrored volume. The invention rapidly pairwise determines what blocks are shared between that most up-to-date mirrored volume and each other mirrored volume, in response to a snapshot of the file system maintained at each mirrored volume and are stored in common pairwise between each mirrored volume and the most up-to-date mirrored volume. The invention re synchronizes only those blocks that have been changed between the common snapshot and the most up-to-date snapshot.
PCT/US2001/031422 2000-10-04 2001-10-04 Recovery of file system data in file servers mirrored file system volumes WO2002029572A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP01979574A EP1325415B1 (en) 2000-10-04 2001-10-04 Recovery of file system data in file servers mirrored file system volumes
DE60112462T DE60112462T2 (en) 2000-10-04 2001-10-04 RESTORING FILE SYSTEM DATA IN FILE SERVER WITH MIRRORED FILE SYSTEM VOLUMES

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/684,487 2000-10-04
US09/684,487 US6654912B1 (en) 2000-10-04 2000-10-04 Recovery of file system data in file servers mirrored file system volumes

Publications (5)

Publication Number Publication Date
WO2002029572A2 WO2002029572A2 (en) 2002-04-11
WO2002029572A8 WO2002029572A8 (en) 2002-09-12
WO2002029572A3 true WO2002029572A3 (en) 2003-01-09
WO2002029572B1 WO2002029572B1 (en) 2003-04-24
WO2002029572A9 WO2002029572A9 (en) 2003-11-13

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2001/031422 WO2002029572A2 (en) 2000-10-04 2001-10-04 Recovery of file system data in file servers mirrored file system volumes

Country Status (4)

Country Link
US (3) US6654912B1 (en)
EP (1) EP1325415B1 (en)
DE (1) DE60112462T2 (en)
WO (1) WO2002029572A2 (en)

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