WO2002029572B1 - 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

Info

Publication number
WO2002029572B1
WO2002029572B1 PCT/US2001/031422 US0131422W WO0229572B1 WO 2002029572 B1 WO2002029572 B1 WO 2002029572B1 US 0131422 W US0131422 W US 0131422W WO 0229572 B1 WO0229572 B1 WO 0229572B1
Authority
WO
WIPO (PCT)
Prior art keywords
file system
mirrored
snapshot
file
volume
Prior art date
Application number
PCT/US2001/031422
Other languages
French (fr)
Other versions
WO2002029572A3 (en
WO2002029572A8 (en
WO2002029572A2 (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 DE60112462T priority Critical patent/DE60112462T2/en
Priority to EP01979574A priority patent/EP1325415B1/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

Links

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00Error detection; Error correction; Monitoring
    • G06F11/07Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16Error detection or correction of the data by redundancy in hardware
    • G06F11/20Error 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
    • G06F11/2053Error 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
    • G06F11/2056Error 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
    • G06F11/2082Data synchronisation
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00Error detection; Error correction; Monitoring
    • G06F11/07Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/16Error detection or correction of the data by redundancy in hardware
    • G06F11/20Error 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
    • G06F11/2053Error 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
    • G06F11/2056Error 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
    • G06F11/2064Error 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
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F11/00Error detection; Error correction; Monitoring
    • G06F11/07Responding to the occurrence of a fault, e.g. fault tolerance
    • G06F11/14Error detection or correction of the data by redundancy in operation
    • G06F11/1402Saving, restoring, recovering or retrying
    • G06F11/1471Saving, restoring, recovering or retrying involving logging of persistent data for recovery
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00Data processing: database and file management or data structures
    • Y10S707/99951File or database maintenance
    • Y10S707/99952Coherency, e.g. same view to multiple users
    • Y10S707/99953Recoverability
    • YGENERAL 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
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00Data processing: database and file management or data structures
    • Y10S707/99951File or database maintenance
    • Y10S707/99952Coherency, e.g. same view to multiple users
    • Y10S707/99955Archiving 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.

Claims

AMENDED CLAIMS[received by the International Bureau on 30 October 2002 (30.10.02); new claims 7-20 added; remaining claims unchanged (4 pages)]
1. A method, including steps of examining a plurality of mirrored file system volumes for a consistency point value; determining a most up-to-date said file system volume in response to said steps of examining; and selecting a set of changed file blocks between said up-to-date said file system and each one of said plurality of mirrored file system volumes.
2. A method as in claim 1, wherein said steps of selecting include determining a snapshot held in common between said most up-to-date said file system volume and at least one of said plurality of mirrored file system volumes; and selecting those file blocks changed between said snapshot held in common and said up-to-date said file system volume.
3. A method as in claim 1 or 2, including steps of re-synchronizing at least one of said plurality of mirrored file system volumes in response to said steps of selecting.
4. Apparatus including a plurality of mirrored file system volumes, each having at least one snapshot including an entire consistent file system, each said snapshot having a consistency point value; a first comparison element capable of being coupled to a plurality of said consistency point values; a second comparison element, responsive to an output of said first comparison element, said second comparison element being capable of being coupled (a) to a first snapshot associated with said output on a first said volume and (b) to a second snapshot associated with a second said volume, said second comparison element being capable of providing a selection of file blocks in response thereto.
5. Apparatus as in claim 4, wherein said second snapshot is held in common between said first volume and said second volume.
6. Apparatus as in claim 4 or 5, including an element capable of re- synchronizing at least one of said plurality of mirrored file system volumes in response to said second comparison element.
7. An apparatus including a memory storing a computer program, said apparatus including a plurality of file volumes, each including a consistency point and at least one snapshot; an instruction for comparing said consistency points and determining which includes a maximal value; and an instruction for copying a set of file blocks from one said file volume associated with said maximal value to another said file volume.
8. An apparatus as in claim 7, wherein said file volume associated with said maximal value is used to generate a new snapshot.
9. An apparatus as in claim 8 also including an instruction for resynchronizing each said file volume with said new snapshot.
10. An apparatus as in claim 7, wherein said maximal value is associated with the most up-to-date file volume.
11. A memory storing information including instructions, the instructions executable by a processor, the instructions including examining a file system information block for each one of a plurality of mirrored file system volumes; determining which one of said mirrored file system volumes includes a consistency point with a maximal value; generating a snapshot from said mirrored file system volume identified in said step of determining;
14 determining a difference between said snapshot and a common snapshot so as to determine a set of file blocks that have been changed; and copying said set of changed file blocks to said mirrored file system volumes.
12. A memory as in claim 11 , wherein said mirrored file system volumes include a RAID subsystem.
13. A memory as in claim 11 , wherein said mirrored file system volumes include parallel stored systems.
14. A memory as in claim 11 , wherein said maximal value indicates the most recent said consistency point.
15. A memory as in claim 11 , wherein said set of changed file blocks includes a collection of data for data objects in said mirrored file system.
16. An apparatus including a memory storing a computer program, said computer program including examining a file system information block for each one of a plurality of mirrored file system volumes; determining which one of said mirrored file system volumes includes a consistency point with a maximal value; generating a snapshot from said mirrored file system volume identified in said step of determining; determining a difference between said snapshot and a common snapshot so as to determine a set of file blocks that have been changed; and copying said set of changed file blocks to said mirrored file system volumes.
17. An apparatus as in claim 16, wherein said mirrored file system volumes include a RAID subsystem.
18. An apparatus as in claim 16, wherein said mirrored file system volumes include parallel stored systems.
15
19. An apparatus as in claim 16, wherein said maximal value indicates the most recent said consistency point.
20. An apparatus as in claim 16, wherein said set of changed file blocks includes a collection of data for data objects in said mirrored file system.
16
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
DE60112462T DE60112462T2 (en) 2000-10-04 2001-10-04 RESTORING FILE SYSTEM DATA IN FILE SERVER WITH MIRRORED FILE SYSTEM VOLUMES
EP01979574A EP1325415B1 (en) 2000-10-04 2001-10-04 Recovery of file system data in file servers mirrored file system volumes

Applications Claiming Priority (2)

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

Publications (5)

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