WO2006020774A3 - Data replication method over a limited bandwidth network by mirroring parities - Google Patents

Data replication method over a limited bandwidth network by mirroring parities Download PDF

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Publication number
WO2006020774A3
WO2006020774A3 PCT/US2005/028565 US2005028565W WO2006020774A3 WO 2006020774 A3 WO2006020774 A3 WO 2006020774A3 US 2005028565 W US2005028565 W US 2005028565W WO 2006020774 A3 WO2006020774 A3 WO 2006020774A3
Authority
WO
WIPO (PCT)
Prior art keywords
data
parity
mirroring
ilm
replication
Prior art date
Application number
PCT/US2005/028565
Other languages
French (fr)
Other versions
WO2006020774A2 (en
Inventor
Ken Qing Yang
John P Dipippo
Original Assignee
Gemini Storage Corp
Ken Qing Yang
John P Dipippo
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
Priority claimed from US10/971,470 external-priority patent/US20060036904A1/en
Application filed by Gemini Storage Corp, Ken Qing Yang, John P Dipippo filed Critical Gemini Storage Corp
Publication of WO2006020774A2 publication Critical patent/WO2006020774A2/en
Publication of WO2006020774A3 publication Critical patent/WO2006020774A3/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
    • G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
    • G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
    • G06F11/1076—Parity data used in redundant arrays of independent storages, e.g. in RAID systems
    • 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
    • G06F11/1446—Point-in-time backing up or restoration of persistent data
    • G06F11/1448—Management of the data involved in backup or backup restore
    • G06F11/1451—Management of the data involved in backup or backup restore by selection of backup contents
    • 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
    • G06F11/1446—Point-in-time backing up or restoration of persistent data
    • G06F11/1458—Management of the backup or restore process
    • G06F11/1464—Management of the backup or restore process for networked environments
    • 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
    • G06F11/2066—Optimisation of the communication load
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2211/00—Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
    • G06F2211/10—Indexing scheme relating to G06F11/10
    • G06F2211/1002—Indexing scheme relating to G06F11/1076
    • G06F2211/1009—Cache, i.e. caches used in RAID system with parity
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2211/00—Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
    • G06F2211/10—Indexing scheme relating to G06F11/10
    • G06F2211/1002—Indexing scheme relating to G06F11/1076
    • G06F2211/1045—Nested RAID, i.e. implementing a RAID scheme in another RAID scheme
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2211/00—Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
    • G06F2211/10—Indexing scheme relating to G06F11/10
    • G06F2211/1002—Indexing scheme relating to G06F11/1076
    • G06F2211/1066—Parity-small-writes, i.e. improved small or partial write techniques in RAID systems

Abstract

A method dramatically reduces the amount of data to be stored and transferred in a networked storage system. Preferably, the network storage system provides continued data protection through mirroring/replication, disk-to-disk backup, data archiving for future retrieval, and Information Lifecycle management (ILM). The idea is to leverage the parity computation that exists in RAID systems. By caching, transferring, and storing data parity or delta bytes of changes on a block as opposed to data block itself, substantial data reduction is possible without using sophisticated compression algorithms at the production side to minimize performance impacts upon production servers. Data can be computed using the parity/delta and previously existing data at mirror side, replication side, backup storage, or at retrieval time upon events such as failures or ILM operations.
PCT/US2005/028565 2004-08-13 2005-08-12 Data replication method over a limited bandwidth network by mirroring parities WO2006020774A2 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US60153504P 2004-08-13 2004-08-13
US60/601,535 2004-08-13
US10/971,470 2004-10-22
US10/971,470 US20060036904A1 (en) 2004-08-13 2004-10-22 Data replication method over a limited bandwidth network by mirroring parities
US11/017,436 US7457980B2 (en) 2004-08-13 2004-12-20 Data replication method over a limited bandwidth network by mirroring parities
US11/017,436 2004-12-20

Publications (2)

Publication Number Publication Date
WO2006020774A2 WO2006020774A2 (en) 2006-02-23
WO2006020774A3 true WO2006020774A3 (en) 2007-04-19

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2005/028565 WO2006020774A2 (en) 2004-08-13 2005-08-12 Data replication method over a limited bandwidth network by mirroring parities

Country Status (2)

Country Link
US (1) US7457980B2 (en)
WO (1) WO2006020774A2 (en)

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US20060036901A1 (en) 2006-02-16
WO2006020774A2 (en) 2006-02-23
US7457980B2 (en) 2008-11-25

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