WO2005086001B1 - Distributed asynchronous ordered replication - Google Patents

Distributed asynchronous ordered replication

Info

Publication number
WO2005086001B1
WO2005086001B1 PCT/US2005/005911 US2005005911W WO2005086001B1 WO 2005086001 B1 WO2005086001 B1 WO 2005086001B1 US 2005005911 W US2005005911 W US 2005005911W WO 2005086001 B1 WO2005086001 B1 WO 2005086001B1
Authority
WO
WIPO (PCT)
Prior art keywords
journal
data
entries
storage device
counter value
Prior art date
Application number
PCT/US2005/005911
Other languages
French (fr)
Other versions
WO2005086001A1 (en
Inventor
Richard Testardi
Original Assignee
Incipient Inc
Richard Testardi
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 Incipient Inc, Richard Testardi filed Critical Incipient Inc
Publication of WO2005086001A1 publication Critical patent/WO2005086001A1/en
Publication of WO2005086001B1 publication Critical patent/WO2005086001B1/en

Links

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
    • G06F11/2071—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 using a plurality of controllers
    • G06F11/2074—Asynchronous techniques
    • 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
    • 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
    • G06F2201/00—Indexing scheme relating to error detection, to error correction, and to monitoring
    • G06F2201/82—Solving problems relating to consistency
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2201/00—Indexing scheme relating to error detection, to error correction, and to monitoring
    • G06F2201/855—Details of asynchronous mirroring using a journal to transfer not-yet-mirrored changes
    • 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
    • Y10S707/99931—Database or file accessing
    • 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
    • Y10S707/99931—Database or file accessing
    • Y10S707/99932—Access augmentation or optimizing
    • 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
    • Y10S707/99931—Database or file accessing
    • Y10S707/99938—Concurrency, e.g. lock management in shared database
    • 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

Described are methods, systems, and apparatus, including computer program products, for achieving distributed asynchronous ordered replication. Distributed asynchronous ordered replication includes creating a first journal for a first set of I/O data, creating a second journal for a second set of I/O data, and temporarily preventing committal, of the second set of I/O data until the second journal is created. In some examples, the first and second journals comprise entries. The entries of the first and second journals include counter values. The entries of the first journal typically have a different counter value than the entries of the second journal.

Claims

25AMENDED CLAIMS [received by the International Bureau on 22 September 2005 (22.09.05); original claims 1 to 29 replaced by new claims 1 to 29 (4 pages)] CLAIMS
1. A method of distributed asynchronous ordered replication, the method comprising: creating a first journal for a first set of I/O data, the first journal comprising an entry associated with a first counter value; creating a second journal for a second set of I O data, the second journal comprising an entry associated with a second counter value; and temporarily preventing committal, to a local storage device, of the second set of I/O data until the second j ournal is created.
2. The method of claim 1 wherein the second journal for the second set of I O data is created before the first set of I/O data has finished committal.
3. The method of claim 1 rurther comprising committing the first set of J/O data to the local storage device and to the first journal at substantially the same time.
4. The method of claim I wherein the iocai storage device comprises a plurality of storage devices.
5. The method of claim 4 wherein the first journal is a plurality of journals.
6. The method of claim 4 wherein the second journal is a plurality of journals,
7. The method of claim 1 wherein the second journal is created in response to the first j ournal filling up.
8. The method of claim 1 wherein the second journal is created in response to a replication interval occurring.
9. The method of claim 8 wherein the replication interval occurs every 30 seconds.
10, The method of claim 1 further comprising sending the first journal to a remote storage device.
11, The method of claim 10 further comprising after sending the first journal to the remote storage device, applying' the entry of the first journal to the remote storage device.
12. The method of claim 10 farther comprising after sending the first journal to the remote storage device, sending the second journal to the remote storage device.
13. The method of claim 12 further comprising applying the entries of the first and second journals to the remote storage device, ordered by the entries' associated counter values.
14. The method of claim 13 wherein entries associated with equal counter values arc applied in a preferred order.
15. The method of claim 14 wherein the preferred order is a random order.
16. The method of claim 14 wherein the preferred order is that order in which the . journal entries are read.
17. The method of claim 14 wherein the preferred order is according to the age of first and second journals.
18. A system for distributed asynchronous ordered replication, the system comprising: a Fast Path; a Control Path; a first journal for a first set of I/O data, the first journal comprising a journal entry associated with a first counter value and representing an I/O operation of the first set of I/O data performed by the Fast Path; and a second journal for a second set of I/O data, the second journal comprising a journal entry associated with a second counter value and representing an I/O operation of the second set of I/O data performed by the Fast Path; wherein the second counter value is different than the first counter value and wherein the Control Path temporarily prevents the Fast Path from performing the I/O operation of the second set of I/O data until the second journal is 27
created.
19. The system of claim 18 further comprising a first storage.
20. The system of claim 19 wherein journal, entries of the first and second journals represent I/O operations performed by the Fast Path on the first storage.
21, The system of claim 20 further comprising a second storage for backing up the first storage.
22. The system of claim 1 wherein journal entries of the first and second journals are applied to the second storage ordered by the entries' associated counter values, wherein entries with equal counter values are applied in a preferred order.
23. The system of claim 22 wherein the preferred order is a random order,
24, The system of claim 22 wherein the preferred order is that order in which the journal entries are read.
25. The system of claim 22 wherein the preferred order is according to the age of the first and second j ournals.
26. The system of claim 18 wherein the journal entry of the first journal is written at substantially the same time the Fast Path performs the I/O operation of the first set of I/O data and the journal entry of the second journal is written at substantially the same time the Fast Path performs the I/O operation of the second set of I/O data.
27. A computer program product, tangibly embodied in an information carrier, for achieving distributed asynchronous ordered replication, the computer program product including instructions being operable to cause a data processing apparatus to: create a first journal for a first set of I/O data, the first journal comprising an entry associated with a first counter value; create a second journal for a second set of I/O data, the second journal 28
comprising an entry associated with a second counter value; and temporarily prevent committal, to a local storage device, of the second set of I/O data until the second journal is created.
28. A means for distributed asynchronous ordered replication, ih>e means comprising: means for creating a first journal for a first set of I/O data, the first journal comprising an entry associated with a first counter value; means for creating a second journal for a second set of I/O data, the second journal comprising an entry associated with a second counter value; and means for temporarily preventing committal, to a local storage device, of the second set of I/O data until the second journal is created.
29. The means of claim 28 wherein the second journal for the second set of I/O data is created before the first set of I/O data has finished committal.
PCT/US2005/005911 2004-02-27 2005-02-25 Distributed asynchronous ordered replication WO2005086001A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US54854504P 2004-02-27 2004-02-27
US60/548,545 2004-02-27

Publications (2)

Publication Number Publication Date
WO2005086001A1 WO2005086001A1 (en) 2005-09-15
WO2005086001B1 true WO2005086001B1 (en) 2005-11-03

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Family Applications (1)

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Country Link
US (1) US7624109B2 (en)
WO (1) WO2005086001A1 (en)

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US7624109B2 (en) 2009-11-24
US20050204106A1 (en) 2005-09-15

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