WO2005122630B1 - Arrangement in a network node for secure storage and retrieval of encoded data distributed among multiple network nodes - Google Patents

Arrangement in a network node for secure storage and retrieval of encoded data distributed among multiple network nodes

Info

Publication number
WO2005122630B1
WO2005122630B1 PCT/US2005/019264 US2005019264W WO2005122630B1 WO 2005122630 B1 WO2005122630 B1 WO 2005122630B1 US 2005019264 W US2005019264 W US 2005019264W WO 2005122630 B1 WO2005122630 B1 WO 2005122630B1
Authority
WO
WIPO (PCT)
Prior art keywords
network node
encoded data
data units
prescribed
prescribed number
Prior art date
Application number
PCT/US2005/019264
Other languages
French (fr)
Other versions
WO2005122630A2 (en
WO2005122630A3 (en
Inventor
Bryan C Turner
John Toebes
Original Assignee
Cisco Tech Inc
Bryan C Turner
John Toebes
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 Cisco Tech Inc, Bryan C Turner, John Toebes filed Critical Cisco Tech Inc
Publication of WO2005122630A2 publication Critical patent/WO2005122630A2/en
Publication of WO2005122630A3 publication Critical patent/WO2005122630A3/en
Publication of WO2005122630B1 publication Critical patent/WO2005122630B1/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
    • G06F11/08—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/14—Multichannel or multilink protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
    • 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
    • G06F2211/1028—Distributed, i.e. distributed RAID systems 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
    • G06F2211/1057—Parity-multiple bits-RAID6, i.e. RAID 6 implementations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13034—A/D conversion, code compression/expansion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13174—Data transmission, file transfer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13215—Code checking, CRC

Abstract

Data is stored using multiple selected network nodes in a network based on encoding of the data info multiple distinct encoded data units according to a prescribed encoding operation. The secure encoding operation generates a first prescribed number of encoded data units, whereas merely a second prescribed number of the encoded data units are necessary for recovery of the original data, the second prescribed number being less than the first prescribed number. The encoded data units are distributed among selected network nodes in a network, where any one network node receives less than the second prescribed number to ensure security. A requesting node recovers the original data by requesting the second prescribed number of encoded data units from among the network nodes having stored the respective encoded data units.

Claims

26
AMENDED CLAIMS received by the International Bureau on 09 November 2006 (09.11.06)
21. The method of claim 20, wherein the sending a second request is based on one of: a determined absence of receiving one of encoded data units having been requested from among the plurality of network nodes; determining one of the encoded data units has been corrupted; and adding integrity to the recovering of the unencoded data unit.
22. The method of claim 21, wherein the prescribed encoding operation is Reed Solomon encoding, the recovering including executing Reed Solomon-based decoding of the first prescribed number of encoded data units to recover the unencoded data unit, the another one of the encoded data units used for one of adding integrity to the recovering of the unencoded data unit, and substituting the another one of the encoded data units in place of the one encoded data unit having been corrupted.
23. The method of claim 15, wherein the prescribed encoding operation is Reed
Solomon encoding, the recovering including executing Reed Solomon-based decoding of the first prescribed number of encoded data units to recover the unencoded data unit.
24. The method of claim 23, wherein the first prescribed number equals at least (4) and the second prescribed number equals at least seven (7).
[Claims 25-48 Canceled]. [Claims 25-48 Canceled]
49. A network node configured for connection to a network, the network node comprising: means for encoding an unencoded data unit into a first prescribed number of encoded data units according to a prescribed encoding operation, the prescribed encoding operation causing each encoded data unit to be distinct from other ones of the encoded data units, the prescribed encoding operation further requiring at least a second prescribed number of the encoded data units for recovery of the unencoded data unit, the second prescribed number being less than the first prescribed number; and means for distributing the first prescribed number of encoded data units among selected network nodes for storage of the encoded data units in the network, the distributing including selecting the selected network nodes based on identified attributes of the unencoded data unit.
50. The network node of claim 49, wherein the means for encoding is configured for executing Reed Solomon encoding as the prescribed encoding operation.
51. The network node of claim 50, wherein the first prescribed number equals at least seven (7) and the second prescribed number equals at least four (4). 28
52. The network node of claim 50, wherein the means for distributing is configured for selecting the selected network nodes, from among available network nodes, based on a prescribed selection attribute.
53. The network node of claim 52, wherein the prescribed selection attribute includes at least one of random selection, distance from the corresponding selected network node, and reliability of the corresponding selected network node.
54. The network node of claim 52, wherein the means for distributing is configured for generating location identifiers for identifying respective encoded data units and the respective selected network nodes based on a prescribed function and applying, as the prescribed selection attribute, an identifier of the unencoded data unit.
55. The network node of claim 50, wherein the distributing means is configured for: generating a copy of at least one of the encoded data units; and sending the copy of the corresponding at least one encoded data unit to another selected network node distinct from the selected network node having received the corresponding at least one encoded data unit.
56. The network node of claim 50, wherein the distributing means is configured for providing at least one identifier to another network node, distinct from the selected network nodes, for enabling identification and retrieval by the another network node of at least the second prescribed number of encoded data units.
57. The network node of claim 56, wherein the at least one identifier includes storage addresses for the respective encoded data units stored in the network.
58. The network node of claim 57, wherein the means for distributing is configured for supplying the storage addresses in response to a request for access to the unencoded data unit from a requesting network node. 29
71. The network node of claim 63, wherein the prescribed encoding operation is Reed Solomon encoding, the means for recovering configured for executing Reed Solomon-based decoding of the first prescribed number of encoded data units to recover the unencoded data unit.
72. The network node of claim 71, wherein the first prescribed number equals at least (4) and the second prescribed number equals at least seven (7).
73. A network node configured for connection to a network, the network node comprising: an encoder portion configured for encoding an unencoded data unit into a first prescribed number of encoded data units according to a prescribed encoding operation, the prescribed encoding operation causing each encoded data unit to be distinct from other ones of the encoded data units, the prescribed encoding operation further requiring at least a second prescribed number of the encoded data units for recovery of the unencoded data unit, the second prescribed number being less than the first prescribed number; and a distribution portion configured for distributing the first prescribed number of encoded data units among selected network nodes for storage of the encoded data units in the network, the distributing including selecting the selected network nodes based on identified attributes of the unencoded data unit.
74. The network node of claim 73, wherein the encoder portion is configured for executing Reed Solomon encoding as the prescribed encoding operation.
75. The network node of claim 74, wherein the first prescribed number equals at least seven (7) and the second prescribed number equals at least four (4).
76. The network node of claim 74, wherein the distribution portion is configured for selecting the selected network nodes, from among available network nodes, based on a prescribed selection attribute. 30
77. The network node of claim 76, wherein the prescribed selection attribute includes at least one of random selection, distance from the corresponding selected network node, and reliability of the corresponding selected network node.
78. The network node of claim 76, wherein the distribution portion is configured for generating location identifiers for identifying respective encoded data units and the respective selected network nodes based on a prescribed function and applying, as the prescribed selection attribute, an identifier of the unencoded data unit.
79. The network node of claim 74, wherein the distribution portion is configured for: generating a copy of at least one of the encoded data units; and sending the copy of the corresponding at least one encoded data unit to another selected network node distinct from the selected network node having received the corresponding at least one encoded data unit.
80. The network node of claim 74, wherein the distribution portion is configured for providing at least one identifier to another network node, distinct from the selected network nodes, for enabling identification and retrieval by the another network node of at least the second prescribed number of encoded data units.
81. The network node of claim 80, wherein the at least one identifier includes storage addresses for the respective encoded data units stored in the network.
82. The network node of claim 81 , wherein the distribution portion is configured for supplying the storage addresses in response to a request for access to the unencoded data unit from a requesting network node.
83. The network node of claim 81 , wherein the another network node is a prescribed shared directory configured for supplying groups of the storage addresses for recovery of respective unencoded data units by requesting network nodes. 31
84. The network node of claim 80, wherein the distribution portion is configured for supplying the identifier in response to a request for access to the unencoded data unit from the another network node.
85. The network node of claim 73, wherein each encoded data unit is secure and unreadable relative to the unencoded data unit.
86. The network node of claim 73, wherein the distribution portion is configured for supplying less than the second prescribed number to any one of the network nodes.
87. A network node configured for connection to a network, the network node comprising: a requester portion configured for requesting from among network nodes a first prescribed number of encoded data units, the encoded data units having been generated based on encoding an unencoded data unit into a second prescribed number of the encoded data units according to a prescribed encoding operation, the first prescribed number of encoded data units representing a minimum number of the encoded data units required for recovery of the unencoded data unit, wherein each encoded data unit is distinct from other ones of the encoded data units, the second prescribed number greater than the first prescribed number; the requester portion further configured for obtaining the first prescribed number of encoded data units from the network, the requester portion receiving less than the first prescribed number of encoded data units from any network node that supplies any one of the encoded data units; and an encoder portion configured for recovering the unencoded data unit based on decoding the obtained first prescribed number of encoded data units.
88. The network node of claim 87, wherein the requester portion is configured for determining an identifier for one of the unencoded data unit and stored locations of the second prescribed number of the encoded data units. 32
89. The network node of claim 88, wherein the requester portion is configured for sending a request for the identifier to a source network node having generated the encoded data units.
90. The network node of claim 89, wherein the requester portion is configured for determining the stored locations based on applying a prescribed function to the identifier.
91. The network node of claim 88, wherein the requester portion is configured for sending a query for the stored locations to a prescribed shared directory configured for supplying storage addresses identifying the respective stored locations of the encoded data units.
92. The network node of claim 87, wherein the requester portion is configured for: sending requests for each of the first prescribed number of the encoded data units among the plurality of network nodes; and sending a second request for another one of the encoded data units to an alternate network node distinct from the plurality of network nodes.
93. The network node of claim 92, wherein the requester portion is configured for sending the second request based on one of: a determined absence of receiving one of encoded data units having been requested from among the plurality of network nodes; a determination that one of the encoded data units has been corrupted; and attempting addition of integrity to the recovering of the unencoded data unit.
94. The network node of claim 93, wherein the prescribed encoding operation is Reed Solomon encoding, the encoder portion configured for executing Reed Solomon-based decoding of the first prescribed number of encoded data units to recover the unencoded data unit, the another one of the encoded data units used for one of adding integrity to the recovering of the unencoded data unit, and substituting the another one of the encoded data units in place of the one encoded data unit having been corrupted. 33
95. The network node of claim 87, wherein the prescribed encoding operation is Reed Solomon encoding, the encoder portion configured for executing Reed Solomon-based decoding of the first prescribed number of encoded data units to recover the unencoded data unit.
96. The network node of claim 95, wherein the first prescribed number equals at least (4) and the second prescribed number equals at least seven (7).
PCT/US2005/019264 2004-06-03 2005-06-02 Arrangement in a network node for secure storage and retrieval of encoded data distributed among multiple network nodes WO2005122630A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/859,209 US7203871B2 (en) 2004-06-03 2004-06-03 Arrangement in a network node for secure storage and retrieval of encoded data distributed among multiple network nodes
US10/859,209 2004-06-03

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WO2005122630A2 WO2005122630A2 (en) 2005-12-22
WO2005122630A3 WO2005122630A3 (en) 2006-12-21
WO2005122630B1 true WO2005122630B1 (en) 2007-03-08

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