CA2106280A1 - Apparatus and methods for fault-tolerant computing employing a daemon monitoring process and fault-tolerant library to provide varying degrees of fault tolerance - Google Patents

Apparatus and methods for fault-tolerant computing employing a daemon monitoring process and fault-tolerant library to provide varying degrees of fault tolerance

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Publication number
CA2106280A1
CA2106280A1 CA2106280A CA2106280A CA2106280A1 CA 2106280 A1 CA2106280 A1 CA 2106280A1 CA 2106280 A CA2106280 A CA 2106280A CA 2106280 A CA2106280 A CA 2106280A CA 2106280 A1 CA2106280 A1 CA 2106280A1
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Canada
Prior art keywords
fault
tolerant
node
monitor
processes
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
CA2106280A
Other languages
French (fr)
Other versions
CA2106280C (en
Inventor
Yennun Huang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AT&T Corp
Original Assignee
Yennun Huang
American Telephone And Telegraph Company
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 Yennun Huang, American Telephone And Telegraph Company filed Critical Yennun Huang
Publication of CA2106280A1 publication Critical patent/CA2106280A1/en
Application granted granted Critical
Publication of CA2106280C publication Critical patent/CA2106280C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G06F11/0703—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
    • G06F11/0793—Remedial or corrective actions
    • 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
    • G06F11/0715—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 system implementing multitasking
    • 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
    • G06F11/1415—Saving, restoring, recovering or retrying at system level
    • G06F11/1438—Restarting or rejuvenating
    • 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
    • G06F11/1479—Generic software techniques for error detection or fault masking
    • 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
    • G06F11/202—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 processing functionality is redundant
    • G06F11/2023—Failover techniques
    • G06F11/203—Failover techniques using migration
    • 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
    • G06F11/2097—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 maintaining the standby controller/processing unit updated

Abstract

Techniques for fault-tolerant computing without fault-tolerant hardware or operating systems. The techniques employ a monitor daemon which is implemented as one or more user processes and a fault-tolerant library which can be bound into application programs. A user process is made fault tolerant by registering it with the monitor daemon. The degree of fault tolerance can be controlled by means of the fault-tolerant library. Included in the fault-tolerant library are functions which define portions of a user process's memory as critical memory, which copy the critical memory to persistent storage, and which restore the critical memory from persistent storage. The monitor daemon monitors fault-tolerant processes, and when such a process hangs or crashes, the daemon restarts it. When the techniques are employed in a mufti-node system, the monitor on each node monitors one other node in addition to the processes in its own node. In addition, the monitor may maintain copies of the state of fault- tolerant processes running at least on the monitored node.
When the monitored node fails, the monitor starts the processes from the monitored node for which the monitor has state on its own node. When a node leaves or rejoins the system, the relationship between monitored and monitoring nodes is automatically reconfigured.
CA002106280A 1992-09-30 1993-09-15 Apparatus and methods for fault-tolerant computing employing a daemon monitoring process and fault-tolerant library to provide varying degrees of fault tolerance Expired - Fee Related CA2106280C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US95454992A 1992-09-30 1992-09-30
US954,549 1992-09-30

Publications (2)

Publication Number Publication Date
CA2106280A1 true CA2106280A1 (en) 1994-03-31
CA2106280C CA2106280C (en) 2000-01-18

Family

ID=25495593

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002106280A Expired - Fee Related CA2106280C (en) 1992-09-30 1993-09-15 Apparatus and methods for fault-tolerant computing employing a daemon monitoring process and fault-tolerant library to provide varying degrees of fault tolerance

Country Status (5)

Country Link
US (1) US5748882A (en)
EP (1) EP0590866B1 (en)
JP (1) JP3145236B2 (en)
CA (1) CA2106280C (en)
DE (1) DE69330239T2 (en)

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DE69330239T2 (en) 2001-11-29
JP3145236B2 (en) 2001-03-12
EP0590866B1 (en) 2001-05-23
EP0590866A2 (en) 1994-04-06
DE69330239D1 (en) 2001-06-28
JPH06202893A (en) 1994-07-22
EP0590866A3 (en) 1997-01-22
US5748882A (en) 1998-05-05
CA2106280C (en) 2000-01-18

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