WO2013080977A1 - フォールトトレラントシステム、フォールトトレラント方法及びプログラム - Google Patents
フォールトトレラントシステム、フォールトトレラント方法及びプログラム Download PDFInfo
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- WO2013080977A1 WO2013080977A1 PCT/JP2012/080637 JP2012080637W WO2013080977A1 WO 2013080977 A1 WO2013080977 A1 WO 2013080977A1 JP 2012080637 W JP2012080637 W JP 2012080637W WO 2013080977 A1 WO2013080977 A1 WO 2013080977A1
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- 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
- G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
- G06F11/079—Root cause analysis, i.e. error or fault diagnosis
-
- 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
- G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
- G06F11/0706—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation the processing taking place on a specific hardware platform or in a specific software environment
- G06F11/0709—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation the processing taking place on a specific hardware platform or in a specific software environment in a distributed system consisting of a plurality of standalone computer nodes, e.g. clusters, client-server 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
- G06F11/0703—Error or fault processing not based on redundancy, i.e. by taking additional measures to deal with the error or fault not making use of redundancy in operation, in hardware, or in data representation
- G06F11/0766—Error or fault reporting or storing
- G06F11/0775—Content or structure details of the error report, e.g. specific table structure, specific error fields
-
- 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
Definitions
- the present invention relates to a system, a method, and a program for managing a fault tolerant system.
- IPCM Incomplete coverage
- coverage models can be broadly classified into component-level failure factor models and system-level reliability and dependency models.
- the component level failure factor model is used in detail about the behavior of the system for each component failure factor.
- BIT built-in testing
- a failure of a component that causes a failure in the entire system regardless of redundancy is called a single point of failure (single point failure).
- Non-Patent Document 1 is shown as a document describing a technique of a conventional incomplete coverage model (or simple coverage model).
- the conventional incomplete coverage model especially the element level coverage model, only considers the identification and isolation of faulty parts. And the common perception was that if the failed parts were not safely isolated from the system, they would become a single point of failure for the system.
- the system may not depend on the state of a specific component having reliability. For example, it occurs when those parts become useless or unrelated to the service in the system state after the reconstruction of other parts. In such a case, it is important to identify and isolate a part that has become irrelevant to the system (hereinafter referred to as an irrelevant part (inappropriate part)) in addition to the failed part. Because identification and isolation of irrelevant irrelevant parts (irrelevant parts) can prevent potential single points of failure caused by their useless or irrelevant irrelevant parts (irrelevant parts). This is because the reliability of the entire system can be remarkably increased.
- Patent Document 1 has a problem that the reliability of the system is impaired by a single point of failure caused by an irrelevant part (an inappropriate part). The reason is that, although a failure of an irrelevant part (inappropriate part) can be a single point of failure for the system, identification and isolation of the irrelevant part (inappropriate part) is represented by Patent Document 1. This is because it is not considered in the conventional coverage model.
- the present invention has been invented in view of the above problems, and its purpose is to identify and isolate irrelevant parts (inappropriate parts) in order to prevent a single point of failure due to irrelevant parts (inappropriate parts). It is an object of the present invention to provide a technique capable of improving the reliability of the entire system by providing a method and a system.
- the present invention is a fault tolerant system, which affects the system fault logic based on the system fault logic means for editing the system fault logic and the system fault logic provided by the system fault logic means.
- a fault tolerant system having irrelevant part coverage means for identifying non-related irrelevant parts and isolating irrelevant parts.
- the present invention is a fault-tolerant method that edits and provides system fault logic, identifies irrelevant parts that do not affect the system fault logic, and isolates the irrelevant parts based on the system fault logic. It is a fault tolerant method.
- the present invention is a fault-tolerant system program, which is a computer that performs system fault logic processing for editing the system fault logic, and has no influence on the system fault logic based on the system fault logic.
- the effect of the present invention is that, in any system state, irrelevant parts (inappropriate parts) are identified and isolated at the appropriate time, and a single point of failure due to irrelevant parts (inappropriate parts) can be prevented. As a result, the reliability of the entire system can be improved.
- FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention.
- FIG. 2 is a flowchart showing the operation of the embodiment of the present invention.
- FIG. 3 is an example of the definition of an irrelevant part (irrelevant event).
- FIG. 4 is a diagram for explaining the embodiment.
- the first embodiment of the present invention includes fault logic means 110, faulty part coverage means 120, and irrelevant part coverage means 130.
- the failure logic means 110 edits and stores the failure logic of the system based on the assumption of complete coverage.
- Fault logic is stored in the form of reliability models, such as fault trees, reliability block diagrams, binary decision trees, and pure logic formulas.
- the faulty part coverage means 120 detects, recovers, isolates the faulty part, and rebuilds the system under the occurrence of a covered part fault.
- the irrelevant part coverage means 130 identifies irrelevant parts (inappropriate parts) based on the system fault logic given by the fault logic means 110 and the occurrence information of the covered fault parts covered by the faulty part coverage means 120. And quarantine.
- the system failure logic is edited (generated) by the failure logic means 110 (step A1).
- the system failure logic consists of a combination of all failed components that can cause a failure in the system. This combination is, for example, a combination represented by a reliability model such as a fault tree, a reliability block diagram, or a pure logic formula. System failure logic does not consider incomplete coverage, i.e. it is analyzed with full coverage.
- an irrelevant part (unsuitable part) is first identified by the irrelevant part coverage means 130 (step A2) and isolated from the system (step A3).
- the component (basic event) b i is an unrelated component (inappropriate component) that is inappropriate or unrelated to f. That is, if f does not depend on the value of b i (0 is false, 1 is true), the part (basic event) b i is an unrelated part (unsuitable part) inappropriate or unrelated to f.
- parts and basic (failure) events to which they correspond are represented using the same symbols. The definition is shown in FIG.
- the system failure logic is coherent in the initial state, such as a coherent failure tree without negative gates or unrelated events, the identification and isolation of irrelevant parts (inappropriate parts) may be omitted in the initial state. it can.
- the system periodically detects the failed part by the failed part coverage means 120 (step A4).
- the system covers the faulty part with the faulty part coverage means 120 (step A6).
- the coverage of the failed part coverage means 120 can be executed in the same manner as that proposed in the conventional incomplete coverage model described in Non-Patent Document 1.
- Step A7 Yes If the fault is covered as a permanent faulty part (Step A7 Yes) and rebuilt so that the system can be operated (Step A8 No), in the event of a covered faulty part, unrelated parts (inappropriate parts) Identification is performed and isolated from the system (steps A2 and A3 are repeated).
- step A8 Yes if the redundancy due to the covered component failure does not work and the covered component failure causes a system failure according to the system failure logic (step A8 Yes), the system goes down. Also, the failure cannot be covered (step A7 No), and a single point of failure occurs due to the faulty part, and the system goes down.
- the Web system S includes two process units, a process unit including a Web server W1 and a database server D1, and a process unit including a Web server W2 and a database server D2.
- the configuration of the Web system S is shown in FIG.
- the Web system S operates if one of the two process units is operable, and the process unit does not operate if either the Web server or the database server fails.
- the failure logic means 110 calculates the system failure logic of the Web system S. If the system failure logic of Web System S does not consider the coverage mechanism, It can be expressed as.
- the failure logic means 110 calculates the system failure logic of the Web system S, and the system failure logic of the Web system S is: It becomes.
- the irrelevant part coverage means 130 is given from the initial system fault logic of the Web system S given by the fault logic means 110 and the system fault logic after the failure of the Web server W 1 is covered, and from the faulty part coverage means 120.
- Database server D 1 (used to support Web server W 1 ) is identified as an irrelevant component (inappropriate component) based on the covered web server W 1 information. Why, if the failed system failure logic of the Web system S of the rear cover of the Web server W 1 This is because the database server D 1 does not appear, and the system failure logic of the Web system S after the cover of the Web server W 1 does not depend on whether or not the database server D 1 has failed.
- the database server D 1 is intended to be isolated from the system in order to avoid a single point of failure that can not be covered in the future, the independent parts coverage means 130, the database server D 1 from the system Isolated.
- the database server D 1 is an appropriate one that is related to the system failure logic of the Web system S, and when the Web server W 1 fails, it becomes an irrelevant part (an inappropriate part). is there. Similarly, if a failure of the database server D 1 occurs, Web server W 1 becomes irrelevant parts (incorrect parts). For even Web server W 2 and database server D 2, it is similar.
- the conventional incomplete coverage model isolates only the parts that have failed. For example, Web server W 1 undergoes a failure, if it is detected, after the coverage, only Web server W 1 is isolated, the database server D 1, after the Web server W 1 has caused a failure, substantial Even if it becomes inappropriate or irrelevant, it remains in the Web system S without being isolated.
- each unit can be configured by hardware, but can also be realized by a computer program.
- functions and operations similar to those of the above-described embodiments or examples are realized by a processor that operates according to a program stored in the program memory.
- a fault tolerant system System fault logic means for editing system fault logic;
- a fault tolerant system comprising irrelevant part coverage means for identifying irrelevant parts that do not affect the system fault logic and isolating irrelevant parts based on the system fault logic provided by the system fault logic means.
- the irrelevant part coverage means includes an initial system fault logic given by the system fault logic means and a system fault logic after covering the faulty part, and information on the covered faulty part given by the faulty part coverage means.
- Appendix 4 Detecting, recovering and isolating faulty parts and reconfiguring the system 4.
- the program is stored in a computer. Execute system restructuring process that detects, recovers and isolates faulty parts and rebuilds the system.
- the process of identifying and isolating the irrelevant parts includes the initial system fault logic by the system fault logic process, the system fault logic after the fault parts are covered, and the information of the covered fault parts given by the system reconstruction process.
- the present invention prevents any unrelated parts (inappropriate parts) from being identified and isolated at an appropriate time in any system state, and prevents a single point of failure due to the unrelated parts (inappropriate parts). As a result, the reliability of the entire system can be improved.
- the present invention is used for reliability management of a fault tolerant system.
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Abstract
Description
となる場合にのみ、部品(基本事象)biはfに対して不適切又は無関係な無関係部品(不適切部品)である。すなわち、fがbiの値(0は偽、1は真)に依存しない場合、部品(基本事象)biはfに対して不適切又は無関係な無関係部品(不適切部品)である。尚、便宜上、部品とそれらが対応する基本(故障)事象とを同じ記号を用いて表している。その定義を図3に示す。
(aおよびbは、基本事象(部品)を表す)
と仮定する。この場合、bは無関係部品(不適切部品)であり、カバーされない単一障害点を発生させる可能性があるものとしてシステムから隔離されるべきである。
となる。
には、データベースサーバD1は現れず、WebサーバW1のカバー後のWebシステムSのシステム障害ロジックはデータベースサーバD1の故障の有無には依存しないからである。
に示される通り、データベースサーバD1はWebシステムSのシステム障害ロジックに関連性のある適切なものであり、WebサーバW1の故障が発生すると、無関係部品(不適切部品)になるということである。同様に、データベースサーバD1の故障が発生すると、WebサーバW1は無関係部品(不適切部品)となる。WebサーバW2とデータベースサーバD2についても、同様である。
システム障害ロジックを編集するためのシステム障害ロジック手段と、
前記システム障害ロジック手段によって与えられた前記システム障害ロジックに基づいて、前記システム障害ロジックに影響を与えない無関係部品を識別し、無関係部品を隔離する無関係部品カバレッジ手段と
を有するフォールトトレラントシステム。
前記無関係部品カバレッジ手段は、前記システム障害ロジック手段によって与えられた初期のシステム障害ロジック及び故障部品のカバー後のシステム障害ロジックと、前記故障部品カバレッジ手段によって与えられたカバーされた故障部品の情報とに基づいて、前記無関係部品を識別し、前記無関係部品を隔離する
付記1に記載のフォールトトレラントシステム。
システム障害ロジックを編集して提供し、
前記システム障害ロジックに基づいて、前記システム障害ロジックに影響を与えない無関係部品を識別し、前記無関係部品を隔離する
フォールトトレラント方法。
初期のシステム障害ロジック及び故障部品のカバー後のシステム障害ロジックと、カバーされた故障部品の情報とに基づいて、前記無関係部品を識別し、前記無関係部品を隔離する
付記3に記載のフォールトトレラント方法。
前記プログラムは、コンピュータに、
システム障害ロジックを編集するシステム障害ロジック処理と、
前記システム障害ロジックに基づいて、前記システム障害ロジックに影響を与えない無関係部品を識別し、前記無関係部品を隔離する無関係部品隔離処理と
を実行させるプログラム。
故障部品の検出、回復および隔離とシステム再構築を行うシステム再構築処理を実行させ、
前記無関係部品を識別して隔離する処理は、システム障害ロジック処理による初期のシステム障害ロジック及び故障部品のカバー後のシステム障害ロジックと、前記システム再構築処理によって与えられたカバーされた故障部品の情報とに基づいて、前記無関係部品を識別し、前記無関係部品を隔離する処理である
付記5に記載のプログラム。
120 故障部品カバレッジ手段
130 無関係部品カバレッジ手段
Claims (6)
- フォールトトレラントシステムであって、
システム障害ロジックを編集するためのシステム障害ロジック手段と、
前記システム障害ロジック手段によって与えられた前記システム障害ロジックに基づいて、前記システム障害ロジックに影響を与えない無関係部品を識別し、無関係部品を隔離する無関係部品カバレッジ手段と
を有するフォールトトレラントシステム。 - 故障部品の検出、回復および隔離とシステム再構築を行う故障部品カバレッジ手段を有し、
前記無関係部品カバレッジ手段は、前記システム障害ロジック手段によって与えられた初期のシステム障害ロジック及び故障部品のカバー後のシステム障害ロジックと、前記故障部品カバレッジ手段によって与えられたカバーされた故障部品の情報とに基づいて、前記無関係部品を識別し、前記無関係部品を隔離する
請求項1に記載のフォールトトレラントシステム。 - フォールトトレラント方法であって、
システム障害ロジックを編集して提供し、
前記システム障害ロジックに基づいて、前記システム障害ロジックに影響を与えない無関係部品を識別し、前記無関係部品を隔離する
フォールトトレラント方法。 - 故障部品の検出、回復および隔離とシステム再構築を行い、
初期のシステム障害ロジック及び故障部品のカバー後のシステム障害ロジックと、カバーされた故障部品の情報とに基づいて、前記無関係部品を識別し、前記無関係部品を隔離する
請求項3に記載のフォールトトレラント方法。 - フォールトトレラントシステムのプログラムであって、
前記プログラムは、コンピュータに、
システム障害ロジックを編集するシステム障害ロジック処理と、
前記システム障害ロジックに基づいて、前記システム障害ロジックに影響を与えない無関係部品を識別し、前記無関係部品を隔離する無関係部品隔離処理と
を実行させるプログラム。 - 前記プログラムは、コンピュータに、
故障部品の検出、回復および隔離とシステム再構築を行うシステム再構築処理を実行させ、
前記無関係部品を識別して隔離する処理は、システム障害ロジック処理による初期のシステム障害ロジック及び故障部品のカバー後のシステム障害ロジックと、前記システム再構築処理によって与えられたカバーされた故障部品の情報とに基づいて、前記無関係部品を識別し、前記無関係部品を隔離する処理である
請求項5に記載のプログラム。
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US14/360,980 US9053023B2 (en) | 2011-11-28 | 2012-11-27 | Fault-tolerant system, fault-tolerant method and program |
JP2013547170A JP5664886B2 (ja) | 2011-11-28 | 2012-11-27 | フォールトトレラントシステム、フォールトトレラント方法及びプログラム |
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Cited By (2)
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WO2015104733A1 (en) * | 2014-01-07 | 2015-07-16 | Nec Corporation | Persistence of relevance identifying system, method, and program |
WO2015173846A1 (en) * | 2014-05-14 | 2015-11-19 | Nec Corporation | A persistence identifying system, method, and program |
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JP6066081B2 (ja) * | 2013-09-03 | 2017-01-25 | インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Machines Corporation | フォールトツリーを生成する装置及び方法 |
US20180321977A1 (en) * | 2015-10-30 | 2018-11-08 | Hewlett Packard Enterprise Development Lp | Fault representation of computing infrastructures |
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- 2012-11-27 WO PCT/JP2012/080637 patent/WO2013080977A1/ja active Application Filing
- 2012-11-27 JP JP2013547170A patent/JP5664886B2/ja not_active Expired - Fee Related
- 2012-11-27 US US14/360,980 patent/US9053023B2/en active Active
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JPH05143570A (ja) * | 1991-11-19 | 1993-06-11 | Nippon Telegr & Teleph Corp <Ntt> | 故障木作成方法 |
JP2000235507A (ja) * | 1999-02-16 | 2000-08-29 | Toshiba Corp | システムの信頼性設計装置及び方法並びにシステムの信頼性設計用ソフトウェアを記録した記録媒体 |
JP2003345620A (ja) * | 2002-05-24 | 2003-12-05 | Hitachi Software Eng Co Ltd | 多ノードクラスタシステムのプロセス監視方法 |
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WO2015104733A1 (en) * | 2014-01-07 | 2015-07-16 | Nec Corporation | Persistence of relevance identifying system, method, and program |
WO2015173846A1 (en) * | 2014-05-14 | 2015-11-19 | Nec Corporation | A persistence identifying system, method, and program |
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US9053023B2 (en) | 2015-06-09 |
US20140325280A1 (en) | 2014-10-30 |
JPWO2013080977A1 (ja) | 2015-04-27 |
JP5664886B2 (ja) | 2015-02-04 |
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