Storage system and method to support scheduled and operational going down of a storing unit

• US 9,652,325 B2
• Filed: 08/25/2010
• Issued: 05/16/2017
• Est. Priority Date: 01/26/2010
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Dematapitiya, Sumudu
• Primary Examiner(s): Rones, Charles
• Assistant Examiner(s): Chang, Tian-Pong
• Application Number:
  US13/522,886
• Publication Number:
  US 20120297154A1
• Time in Patent Office: 2,456 Days
• CPC Class Codes: G06F 11/08 Error detection or correction by redundancy in data representation, e.g. by using checking codes
• CPC Class Codes: G06F 11/1076 Parity data used in redundant arrays of independent storages, e.g. in RAID systems
• CPC Class Codes: G06F 11/1088 Reconstruction on already foreseen single or plurality of spare disks
• CPC Class Codes: G06F 11/1092 Rebuilding, e.g. when physically replacing a failing disk
• CPC Class Codes: G06F 11/2094 Redundant storage or storage space G06F11/2056 takes precedence
• CPC Class Codes: G06F 3/0689 Disk arrays, e.g. RAID, JBOD

Abstract

There are provided: a distribution storage processing unit for distributing and storing a plurality of fragment data including division data obtained by dividing storage target data into a plurality of pieces and redundant data into a plurality of storing unit; an operation status detecting unit for detecting operation statuses of the respective storing unit; and a data regenerating unit for, in accordance with a result of the detection by the operation status detecting unit, when any of the storing unit goes down, regenerating the fragment data having been stored in the down storing unit based on the other fragment data stored in the other storing unit different from the down storing unit. Moreover, the data regenerating unit has a function of transferring and storing the fragment data stored in the storing unit previously scheduled to go down into the other storing unit before the storing unit goes down.

Claims

1. A storage system, comprising a plurality of storing units and a data processing unit for storing data into the plurality of storing units and retrieving the data stored in the storing units,

wherein the data processing unit includes:

a distribution storage processing unit for distributing and storing a plurality of fragment data including division data obtained by dividing storage target data into a plurality of pieces and redundant data for restoring the storage target data, into the plurality of storing units;

an operation status detecting unit for executing detection of an operation status of each of the storing units; and

a data regenerating unit for, in accordance with a result of the detection by the operation status detecting unit, when any of the storing units goes down, executing regeneration of the fragment data having been stored in the down storing unit based on other of the fragment data stored in another of the storing units different from the down storing unit, and storing into the other of the storing units; and

wherein the data regenerating unit has a function of transferring and storing the fragment data stored in the storing unit previously scheduled to go down into another of the storing units before the storing unit scheduled to go down goes down,

wherein based on operation schedule data in which it is previously set the storing unit goes down, the data regenerating unit transfers and stores the fragment data stored in the storing unit into another of the storing units before the storing unit goes down and, when the storing unit scheduled to go down goes down, the data regenerating unit does not execute the regeneration of the fragment data having been stored in the storing unit,

wherein when any of the storing units goes down in accordance with an input operation instruction, the data regenerating unit executes a process of the regeneration of the fragment data having been stored in the down storing unit with lower priority than priority set on another process in the storage system, and

wherein in a case that the down storage unit does not recover within a preset time during the time of execution of the process of the regeneration of the fragment data stored in the down storing unit with the lower priority, the data regenerating unit executes the process of the regeneration with higher priority than the lower priority.

2. The storage system according to claim 1, wherein when any of the storing units goes down, in a case that a number of times of going down within a previously set time of the down storing unit is less than a previously set number, the data regenerating unit executes a process of the regeneration of the fragment data having been stored in the down storing unit with lower priority than priority set on another process in the storage system.

3. The storage system according to claim 1,

wherein when any of the storing units goes down, in a case that a number of times of going down within a previously set time of the down storing unit is equal to or more than a previously set number, the data regenerating unit executes the process of the regeneration of the fragment data having been stored in the down storing unit with higher priority than priority set on another process in the storage system.

4. The storage system according to claim 1, comprising a data restoring unit for, when the down storing unit recovers, executing restoration of the fragment data stored in the other of the storing units by a process of the regeneration into the recovered storing unit,

wherein in a case that a number of times of going down within a previously set time of the recovered storing unit is equal to or more than a previously set number, the data restoring unit does not execute restoration of the fragment data into the storing unit.

5. An information processing device that is connected to a plurality of storing units and that stores data into the plurality of storing units and retrieves the data stored in the storing units, the information processing device comprising:

a distribution storage processing unit for distributing and storing a plurality of fragment data including division data obtained by dividing storage target data into a plurality of pieces and redundant data for restoring the storage target data, into the plurality of storing units;

an operation status detecting unit for executing detection of an operation status of each of the storing units; and

a data regenerating unit for, in accordance with a result of the detection by the operation status detecting unit, when any of the storing units goes down, executing regeneration of the fragment data having been stored in the down storing unit based on other of the fragment data stored in another of the storing units different from the down storing unit, and storing into the other of the storing units,

wherein the data regenerating unit has a function of transferring and storing the fragment data stored in the storing unit previously scheduled to go down into another of the storing units before the storing unit scheduled to go down goes down,

wherein based on operation schedule data in which it is previously set the storing unit goes down, the data regenerating unit transfers and stores the fragment data stored in the storing unit into another of the storing units before the storing unit goes down and, when the storing unit scheduled to go down goes down, the data regenerating unit does not execute the regeneration of the fragment data having been stored in the storing unit,

wherein when any of the storing units goes down in accordance with an input operation instruction, the data regenerating unit executes a process of the regeneration of the fragment data having been stored in the down storing unit with lower priority than priority set on another process in the storage system, and

wherein in a case that the down storage unit does not recover within a preset time during the time of execution of the process of the regeneration of the fragment data stored in the down storing unit with the lower priority, the data regenerating unit executes the process of the regeneration with higher priority than the lower priority.

6. A non-transitory computer-readable medium storing a program comprising instructions for causing an information processing device that is connected to a plurality of storing units and that stores data into the plurality of storing units and retrieves the data stored in the storing units, to realize:

a distribution storage processing unit for distributing and storing a plurality of fragment data including division data obtained by dividing storage target data into a plurality of pieces and redundant data for restoring the storage target data, into the plurality of storing units;

an operation status detecting unit for executing detection of an operation status of each of the storing units; and

a data regenerating unit for, in accordance with a result of the detection by the operation status detecting unit, when any of the storing units goes down, executing regeneration of the fragment data having been stored in the down storing unit based on other of the fragment data stored in another of the storing units different from the down storing unit, and storing into the other of the storing units, and transferring and storing the fragment data stored in the storing unit previously scheduled to go down into another of the storing units before the storing unit goes down,

wherein based on operation schedule data in which it is previously set the storing unit goes down, the data regenerating unit transfers and stores the fragment data stored in the storing unit into another of the storing units before the storing unit goes down and, when the storing unit scheduled to go down goes down, the data regenerating unit does not execute the regeneration of the fragment data having been stored in the storing unit,

wherein when any of the storing units goes down in accordance with an input operation instruction, the data regenerating unit executes a process of the regeneration of the fragment data having been stored in the down storing unit with lower priority than priority set on another process in the storage system, and

wherein in a case that the down storage unit does not recover within a preset time during the time of execution of the process of the regeneration of the fragment data stored in the down storing unit with the lower priority, the data regenerating unit executes the process of the regeneration with higher priority than the lower priority.

7. An information processing method in an information processing device that is connected to a plurality of storing units and that stores data into the plurality of storing units and retrieves the data stored in the storing units,

the information processing method comprising:

distributing and storing a plurality of fragment data including division data obtained by dividing storage target data into a plurality of pieces and redundant data for restoring the storage target data, into the plurality of storing units;

executing detection of an operation status of each of the storing units; and

in accordance with a result of the detection by the operation status detecting units when any of the storing units goes down, executing regeneration of the fragment data having been stored in the down storing unit based on other of the fragment data stored in another of the storing units different from the down storing unit, and storing into the other of the storing units; and

the information processing method comprising transferring and storing the fragment data stored in the storing unit previously scheduled to go down into another of the storing units before the storing unit goes down,

wherein based on operation schedule data in which it is previously set the storing unit goes down, transferring and storing the fragment data stored in the storing unit into another of the storing units before the storing unit goes down and, when the storing unit scheduled to go down goes down, the data regenerating unit does not execute the regeneration of the fragment data having been stored in the storing unit,

wherein when any of the storing units goes down in accordance with an input operation instruction, the regeneration of the fragment data having been stored in the down storing unit is executed with lower priority than priority set on another process in the storage system, and

wherein in a case that the down storage unit does not recover within a preset time during the time of execution of the regeneration of the fragment data stored in the down storing unit with the lower priority, the regeneration is executed with higher priority than the lower priority.