Apparatus and method for a distributed raid

• US 20030084397A1
• Filed: 10/31/2001
• Published: 05/01/2003
• Est. Priority Date: 10/31/2001
• Status: Abandoned Application

• Current Assignee: Exanet Ltd (Dell Technologies Inc.)
• Original Assignee: Exanet Ltd (Dell Technologies Inc.)
• Inventors: Peleg, Nir
• Application Number:
  US09/984,850
• Publication Number:
  US 20030084397A1
• Time in Patent Office: Days
• US Class Current: 714/770
• CPC Class Codes: G06F 11/1076 Parity data used in redundant arrays of independent storages, e.g. in RAID systems
• CPC Class Codes: G06F 2211/1028 Distributed, i.e. distributed RAID systems with parity

Abstract

The invention presented is targeted to provide a system solution for a networked redundant array of independent disks (RAID). Disclosed are a system and method for the connection of RAID system as well as the ability to cascade RAID solutions to provide high-end storage solutions.

Claims

1. A network RAID controller comprising:

a microcontroller having a plurality of operation instructions;

a multi-port memory connected to said microcontroller;

at least one FIFO device connected to said multi-port memory, said at least one FIFO device capable of interfacing with a network; and

a map memory connected to said microcontroller, said map memory storing address maps.

2. The network RAID controller as claimed in claim 1, further comprising a parity device connected to said microcontroller.

3. The network RAID controller as claimed in claim 1, wherein said plurality of operation instructions comprise object code instructions that are adapted to implement a plurality of RAID functions.

4. The network RAID controller as claimed in claim 3, wherein said object code instructions implement at least one of RAID 0, RAID 1, RAID 2, RAID 3, RAID 4, RAID 5, RAID 6, RAID 7, RAID 10, RAID 30 and RAID 50 functions.

5. The network RAID controller as claimed in claim 1, wherein said map memory further comprises a conversion table that converts addresses received from a host computer into addresses targeted to a data storage device.

6. The network RAID controller as claimed in claim 1, wherein said map memory further comprises a conversion table that converts addresses received from a host computer into network addresses.

7. The network RAID controller as claimed in claim 2, wherein said parity device generates at least odd parity information.

8. The network RAID controller as claimed in claim 2, wherein said parity device generates at least even parity information.

9. The network RAID controller as claimed in claim 4, further comprising a parity device connected to said microcontroller, said parity device generates parity information based upon the type of RAID function implemented.

10. The network RAID controller as claimed in claim 2, wherein said parity device and said microcontroller perform an error correction function.

11. The network RAID controller as claimed in claim 1, wherein said at least one FIFO device is a plurality of FIFO devices.

12. The network RAID controller as claimed in claim 2, wherein said parity device is an exclusive-OR engine.

13. The network RAID controller as claimed in claim 1, said microcontroller further comprising an instruction memory storing said plurality of operation instructions;

14. A computer network comprising:

a network;

a host computer connected to said network;

a plurality of data drives connected to said network; and

a network RAID controller as claimed in claim 1, said network RAID controller connected to said network.

15. A computer network comprising:

a network;

a host computer connected to said network;

a plurality of data drives connected to said network; and

a plurality of network RAID controllers as claimed in claim 1, wherein each of said plurality of network RAID controllers are connected to said network.

16. A computer network comprising:

a primary network;

a host computer connected to said primary network;

a secondary network;

a network RAID controller as claimed in claim 1, wherein said network RAID controller is connected to said primary network and to said secondary network; and

a plurality of data drives connected to said secondary network.

17. A network RAID controller comprising:

an embedded computer having a plurality of operation instructions;

a multi-port memory connected to said embedded computer;

at least one FIFO device connected to said multi-port memory, said at least one FIFO device capable of interfacing with a network;

a map memory connected to said embedded computer, said map memory storing address maps.

18. The network RAID controller as claimed in claim 17, further comprising a parity device connected to said embedded computer.

19. The network RAID controller as claimed in claim 17, wherein said plurality of operation instructions comprise object code instructions that are adapted to implement a plurality of RAID functions.

20. The network RAID controller as claimed in claim 19, wherein said object code instructions implement RAID 0, RAID 1, RAID 2, RAID 3, RAID 4, RAID 5, RAID 6, RAID 7, RAID 10, RAID 30 and RAID 50 functions.

21. The network RAID controller as claimed in claim 17, wherein said map memory further comprises a conversion table that converts addresses received from a host computer into addresses targeted to a data storage device.

22. The network RAID controller as claimed in claim 17, wherein said map memory further comprises a conversion table that converts addresses received from a host computer into network addresses.

23. The network RAID controller as claimed in claim 18, wherein said parity device generates at least odd parity information.

24. The network RAID controller as claimed in claim 18, wherein said parity device generates at least even parity information.

25. The network RAID controller as claimed in claim 20, further comprising a parity device connected to said embedded computer, said parity device generates parity information based upon the type of RAID function implemented.

26. The network RAID controller as claimed in claim 17, wherein said parity device and said embedded computer perform an error correction function.

27. The network RAID controller as claimed in claim 17, wherein said at least one FIFO device is a plurality of FIFO devices.

28. The network RAID controller as claimed in claim 18, wherein said parity device is an exclusive-OR engine.

29. The network RAID controller as claimed in claim 17, said embedded computer further comprising an instruction memory storing said plurality of operation instructions.

30. A computer network comprising:

a network;

a host computer connected to said network;

a plurality of data drives connected to said network; and

a network RAID controller as claimed in claim 17, said network RAID controller connected to said network.

31. A computer network comprising:

a network;

a host computer connected to said network;

a plurality of data drives connected to said network; and

a plurality of network RAID controllers as claimed in claim 17, wherein each of said plurality of network RAID controllers are connected to said network.

32. A computer network comprising:

a primary network;

a host computer connected to said primary network;

a secondary network;

a network RAID controller as claimed in claim 17, wherein said network RAID controller is connected to said primary network and to said secondary network; and

a plurality of data drives connected to said secondary network.

33. A network RAID controller comprising:

control means;

means for storing a plurality of operation instructions, said means connected to said control means;

a multi-port memory means connected to said control means;

means for interfacing connected to said multi-port memory means, said means for interfacing capable of interfacing with a network; and

means for storing address maps, said means connected to said control means.

34. The network RAID controller as claimed in claim 33, further comprising means for parity generation, said parity generation means connected to said control means.

35. The network RAID controller as claimed in claim 33, wherein said plurality of operation instructions comprise object code instructions that are adapted to implement a plurality of RAID functions.

36. The network RAID controller as claimed in claim 35, wherein said object code instructions implement RAID 0, RAID 1, RAID 2, RAID 3, RAID 4, RAID 5, RAID 6, RAID 7, RAID 10, RAID 30 and RAID 50 functions.

37. The network RAID controller as claimed in claim 33, wherein said means for storing address maps stores a conversion table that converts addresses received from a host computer into addresses targeted to a data storage device.

38. The network RAID controller as claimed in claim 33, wherein said means for storing address maps stores a conversion table that converts addresses received from a host computer into network addresses.

39. The network RAID controller as claimed in claim 34, wherein said means for parity generation generates odd parity information.

40. The network RAID controller as claimed in claim 34, wherein said means for parity generation generates even parity information.

41. The network RAID controller as claimed in claim 36, further comprising means for parity generation, said parity generation means generates parity information based upon the type of RAID function implemented.

42. The network RAID controller as claimed in claim 34, wherein said means for parity generation and said control means perform an error correction function.

43. The network RAID controller as claimed in claim 33, wherein said means for interfacing is a plurality of FIFO devices.

44. The network RAID controller as claimed in claim 34, wherein said means for parity generation is an exclusive-OR engine.

45. The network RAID controller as claimed in claim 33, said control means further comprises an instruction memory storing said plurality of operation instructions;

46. A network RAID controller comprising:

computing means having a plurality of operation instructions;

a multi-port memory means connected to said computing means;

means for interfacing connected to said multi-port memory means, said means for interfacing capable of interfacing with a network; and

means for storing address maps, said means connected to said computing means.

47. The network RAID controller as claimed in claim 46, further comprising means for parity generation, said parity generation means connected to said computing means.

48. The network RAID controller as claimed in claim 46, wherein said plurality of operation instructions comprise object code instructions that are adapted to implement a plurality of RAID functions.

49. The network RAID controller as claimed in claim 48, wherein said object code instructions implement RAID 0, RAID 1, RAID 2, RAID 3, RAID 4, RAID 5, RAID 6, RAID 7, RAID 10, RAID 30 and RAID 50 functions.

50. The network RAID controller as claimed in claim 46, wherein said means for storing address maps stores a conversion table that converts addresses received from a host computer into addresses targeted to a data storage device.

51. The network RAID controller as claimed in claim 46, wherein said means for storing address maps stores a conversion table that converts addresses received from a host computer into network addresses.

52. The network RAID controller as claimed in claim 47, wherein said means for parity generation generates odd parity information.

53. The network RAID controller as claimed in claim 47, wherein said means for parity generation generates even parity information.

54. The network RAID controller as claimed in claim 49, further comprising means for parity generation, said parity generation means connected to said computing means and said parity generation means generates parity information based upon the type of RAID function implemented.

55. The network RAID controller as claimed in claim 47, wherein said means for parity generation and said control means perform an error correction function.

56. The network RAID controller as claimed in claim 46, wherein said means for interfacing is a plurality of FIFO devices.

57. The network RAID controller as claimed in claim 47, wherein said means for parity generation is an exclusive-OR engine.

58. The network RAID controller as claimed in claim 46, said control means further comprises an instruction memory storing said plurality of operation instructions.

59. A computer network comprising:

a primary network;

a host computer connected to said primary network;

a secondary network;

a network RAID controller connected to said primary network and to said secondary network;

a plurality of group units, each of said group units comprising;

a local bus;

a plurality of data drives connected to said local bus;

a group unit RAID controller connected to said local bus, said group unit RAID controller also connected to said secondary network.

60. The computer network as claimed in claim 59, wherein each of said group unit RAID controllers comprise:

a microcontroller having a plurality of operation instructions;

a multi-port memory connected to said microcontroller;

a plurality of FIFO devices connected to said multi-port memory, wherein one of said plurality of FIFO devices is connected to said secondary network and one of said plurality of FIFO devices is connected to said local bus; and

a map memory connected to said microcontroller, said map memory storing address maps.

61. The group unit RAID controller as claimed in claim 60, further comprising a parity device connected to said microcontroller.

62. The group unit RAID controller as claimed in claim 60, wherein said plurality of operation instructions comprise object code instructions that are adapted to implement a plurality of RAID functions.

63. The group unit RAID controller as claimed in claim 62, wherein said object code instructions implement RAID 0, RAID 1, RAID 2, RAID 3, RAID 4, RAID 5, RAID 6, RAID 7, RAID 10, RAID 30 and RAID 50 functions.

64. The group unit RAID controller as claimed in claim 60, wherein said map memory further comprises an conversion table that converts addresses received from said host computer into addresses targeted to said plurality of data drives.

65. The group unit RAID controller as claimed in claim 63, further comprising a parity device connected to said microcontroller, wherein said parity device generates parity information based upon the type of RAID function implemented.

66. The group unit RAID controller as claimed in claim 61, wherein said parity device and said microcontroller perform an error correction function.

67. The group unit RAID controller as claimed in claim 61, wherein said parity device is an exclusive-OR engine.

68. The group unit RAID controller as claimed in claim 60, said microcontroller further comprising an instruction memory storing said plurality of operation instructions;

69. A computer network comprising:

a host computer connected to a network;

at least one network RAID controller connected to said network, said network RAID controller executes a mapping function that maps addresses supplied by said host computer to storage addresses; and

at least one data storage device connected to said network.

70. The computer network as claimed in claim 69, wherein said at least one network RAID controller executes a data mirroring function.

71. The computer network as claimed in claim 69, wherein said at least one network RAID controller computes parity information.

72. The computer network as claimed in claim 69, wherein said at least one network RAID controller executes an error correction function.

73. The computer network as claimed in claim 72, wherein said error correction function is performed based on parity information generated by said at least one network RAID controller.

74. The computer network as claimed in claim 69, wherein said mapping of storage addresses comprises:

identifying the RAID level required;

generating at least two storage addresses for the address supplied by the host computer; and

maintaining a cross-reference of said addresses supplied by said host computer to said generated storage addresses.

75. The computer network as claimed in claim 74, wherein generating at least two storage addresses for the address further comprises generating parity information corresponding to the data received from said host computer and in accordance with said required RAID level prior to writing the received data to said generated storage addresses.

76. The computer network as claimed in claim 75, wherein the received data and the generated parity information corresponding to the received data are written to said generated storage addresses.

77. The computer network as claimed in claim 74, wherein if data is requested from said at least one data storage device, said network RAID controller performs a read operation comprising:

retrieving the requested data using the storage addresses from the storage address cross-reference;

retrieving parity information from said storage addresses in accordance with said required RAID level;

checking the requested data read from said storage addresses against the retrieved parity information in accordance with said required RAID level;

if error is found, using error correcting techniques and the retrieved parity information to generate a corrected version of the requested data; and

forwarding the retrieved data to said host computer.

78. The computer network as claimed in claim 74, wherein at least one generated address is an address of said controller.

79. The computer network as claimed in claim 74, wherein generation of said storage addresses is a result of a pre-loaded conversion table to said network RAID controller.

80. A computer network comprising:

a host computer connected to a first network;

at least one data storage device connected a second network;

at least one network RAID controller connected to said first network and to said second network, said network RAID controller executes a mapping function that maps addresses supplied by said host computer to storage addresses.

81. The computer network as claimed in claim 80, wherein said at least one network RAID controller executes a data mirroring function.

82. The computer network as claimed in claim 80, wherein said at least one network RAID controller computes parity information.

83. The computer network as claimed in claim 80, wherein said at least one network RAID controller executes an error correction function.

84. The computer network as claimed in claim 83, wherein said error correction function is performed based on parity information generated by said at least one network RAID controller.

85. The computer network as claimed in claim 80, wherein said mapping of storage addresses comprises:

identifying the RAID level required;

generating at least two storage addresses for the address supplied by the host computer; and

maintaining a cross-reference of said addresses supplied by said host computer to said generated storage addresses.

86. The computer network as claimed in claim 85, wherein generating at least two storage addresses for the address further comprises generating parity information corresponding to the data received from said host computer and in accordance with said required RAID level prior to writing the received data to said generated storage addresses.

87. The computer network as claimed in claim 86, wherein the received data and the generated parity information corresponding to the received data are written to said generated storage addresses.

88. The computer network as claimed in claim 85, wherein if data is requested from said at least one data storage device, said network RAID controller performs a read operation comprising:

retrieving the requested data using the storage addresses from the storage address cross-reference;

retrieving parity information from said storage addresses in accordance with said required RAID level;

checking the requested data read from said storage addresses against the retrieved parity information in accordance with said required RAID level;

if error is found, using error correcting techniques and the retrieved parity information to generate a corrected version of the requested data; and

forwarding the retrieved data to said host computer.

89. The computer network as claimed in claim 85, wherein at least one generated address is an address of said network RAID controller.

90. The computer network as claimed in claim 85, wherein generation of said storage addresses is a result of a pre-loaded conversion table to said network RAID controller.

91. The computer network as claimed in claim 80, wherein said address from said host computer is sent over said first network.

92. The computer network as claimed in claim 80, wherein said storage addresses are sent over said second network.

93. A computer network comprising:

a host computer connected to a first network;

a second network;

a network RAID controller connected to said first network and to said second network, said network RAID controller for mapping addresses supplied by said host computer to storage addresses; and

a plurality of group units, each group unit comprising;

a local network;

a plurality of data drives connected to said local network; and

a group unit RAID controller for mapping addresses supplied by said host computer to storage addresses, said group unit RAID controller connected to said second network.

94. The computer network as claimed in claim 93, wherein said at least one network RAID controller executes a data mirroring function.

95. The computer network as claimed in claim 93, wherein said at least one network RAID controller computes parity information.

96. The computer network as claimed in claim 93, wherein said at least one network RAID controller executes an error correction function.

97. The computer network as claimed in claim 96, wherein said error correction function is performed based on parity information generated by said at least one network RAID controller.

98. The computer network as claimed in claim 93, wherein said mapping of storage addresses comprises:

identifying the RAID level required;

generating at least two storage addresses for the address supplied by the host computer; and

maintaining a cross-reference of said storage addresses supplied by said host computer to said generated storage addresses.

99. The computer network as claimed in claim 98, wherein said on of said storage addresses is an address of one of said group unit data drives.

100. The computer network as claimed in claim 98, wherein said network address is an address of one of said group unit RAID controllers.

101. The computer network as claimed in claim 98, wherein generating at least two storage addresses for the address supplied by the host computer further comprises generating parity information corresponding to the data received from said host computer and in accordance with said required RAID level prior to writing the received data to said generated storage addresses.

102. The computer network as claimed in claim 101, wherein the received data and the generated parity information corresponding to the received data are written to said generated storage addresses.

103. The computer network as claimed in claim 98, wherein if data is requested from said at least one data storage device, said network RAID controller performs a read operation comprising:

retrieving the requested data using the storage addresses from the storage address cross-reference;

retrieving parity information from said storage addresses in accordance with said required RAID level;

checking the requested data read from said storage addresses against the retrieved parity information in accordance with said required RAID level;

if error is found, using error correcting techniques and the retrieved parity information to generate a corrected version of the requested data; and

forwarding the retrieved data to said host computer.

104. The computer network as claimed in claim 98, wherein at least one of said generated storage addresses is an address of said first controller.

105. The computer network as claimed in claim 104, wherein at least one of said generated storage addresses is sent over said first network.

106. The computer network as claimed in claim 104, wherein at least one of said generated storage addresses is sent over said second network.

107. The computer network as claimed in claim 98, wherein at least one of said generated storage addresses is an address of one of said group unit network controllers.

108. The computer network as claimed in claim 98, wherein generation of said storage addresses is a result of a pre-loaded conversion table to said network RAID controller.

109. A method for accessing a networked RAID system comprising a network RAID controller and a plurality of data drives, comprising:

providing host addresses for storage access requests;

requesting a storage access by accessing the network RAID controller;

generating at least two network storage addresses; and

accessing said plurality of data drives using said network storage addresses.

110. The method as claimed in claim 109, said method further comprises loading an address conversion table for converting host addresses to said network storage addresses.

111. The method of claim 109, wherein said generated network addresses are generated based on RAID level required.

112. The method of claim 109, wherein at least one of said generated network addresses is the address of said network RAID controller.

113. The method of claim 109, wherein at least one of said generated network addresses is the address of a second network RAID controller.

114. The method of claim 109, wherein if said host computer issues a write request, the method further comprises:

checking if said RAID level requires parity support; and

generating parity information if said parity support is required.

115. The method of claim 109, the method further comprises writing received data and any generated parity information.

116. The method of claim 109, wherein if said host computer issues a write request, the method further comprises:

checking if said RAID level requires parity support;

if said parity support is required, the method further comprises;

reading parity information corresponding to said data; and

checking if retrieved data is correct, and if not, generating correct the retrieved data using error correcting techniques corresponding with said parity information;

forwarding the retrieved data to said host computer.