GB1168414A - Data Processing Systems - Google Patents

Data Processing Systems

Info

Publication number
GB1168414A
GB1168414A GB35457/68A GB3545768A GB1168414A GB 1168414 A GB1168414 A GB 1168414A GB 35457/68 A GB35457/68 A GB 35457/68A GB 3545768 A GB3545768 A GB 3545768A GB 1168414 A GB1168414 A GB 1168414A
Authority
GB
United Kingdom
Prior art keywords
recovery log
buffer
during
main storage
error
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.)
Expired
Application number
GB35457/68A
Inventor
Jeganandaraj Amal Arulpragasam
Dennis Craven Binks
Martin Coxwell Pinnell
Richard Lowell Price
Harold William Tuffill
Vincent Charles Vasile
Robin Waugh
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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
Priority to GB34429/68A priority Critical patent/GB1163859A/en
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Priority to GB35457/68A priority patent/GB1168414A/en
Priority to BE734986D priority patent/BE734986A/xx
Priority to FR6921617A priority patent/FR2014710A1/fr
Priority to FR6921611A priority patent/FR2014655A1/fr
Priority to CH1062469A priority patent/CH499157A/en
Priority to JP5551269A priority patent/JPS4727258B1/ja
Priority to DE1966991A priority patent/DE1966991C3/en
Priority to DE19691936251 priority patent/DE1936251C3/en
Priority to ES369639A priority patent/ES369639A1/en
Priority to SE10196/69A priority patent/SE346170B/xx
Priority to NL6911126A priority patent/NL6911126A/xx
Publication of GB1168414A publication Critical patent/GB1168414A/en
Expired 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
    • G06F11/16—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
    • G06F11/2046—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 where the redundant components share persistent storage
    • 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
    • G06F11/1405—Saving, restoring, recovering or retrying at machine instruction level
    • G06F11/141—Saving, restoring, recovering or retrying at machine instruction level for bus or memory accesses
    • 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
    • G06F11/2028—Failover techniques eliminating a faulty processor or activating a spare
    • 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
    • G06F11/2038—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 with a single idle spare processing component
    • 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
    • G06F11/2053—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 persistent mass storage functionality or persistent mass storage control functionality is redundant
    • G06F11/2056—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 persistent mass storage functionality or persistent mass storage control functionality is redundant by mirroring
    • G06F11/2058—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 persistent mass storage functionality or persistent mass storage control functionality is redundant by mirroring using more than 2 mirrored copies
    • 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

1,168,414. Data processing. INTERNATIONAL BUSINESS MACHINES CORP. 25 July, 1968, No. 35457/68. Heading G4A. In a data processing system, recovery log storage is connected via a recovery log buffer to predetermined data locations in a C.P.U. (central processing unit) for recording data therefrom, and is updated after predetermined intervals but only after error checking circuitry in the C.P.U. has indicated error-free data flow in the C.P.U. during the current interval. The output of main storage goes via error-correcting circuitry to both the C.P.U. and a main storage buffer (which holds the 7 latest items from main storage and their addresses). Instruction fetch and execution cycles occur alternately. Changes in various C.P.U. registers during execution cycles are followed by a recovery log buffer the contents of which are passed to the recovery log storage during the respective following fetch cycles except that detection of an error in the C.P.U. during an execution cycle freezes the recovery log buffer, recovery log storage and main storage buffer to permit subsequent resumption of the programme or instruction retry without data loss. The recovery log buffer may be an associative store holding only the new contents of the portions of the C.P.U. registers which have actually changed, together with tags identifying the register portions. The recovery log arrangements, including the main storage buffer, have a separate power supply. Changes in the C.P.U. during fetch cycles may be stored in the recovery log storage during execution cycles.
GB35457/68A 1968-07-19 1968-07-25 Data Processing Systems Expired GB1168414A (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
GB34429/68A GB1163859A (en) 1968-07-19 1968-07-19 Data Processing Systems
GB35457/68A GB1168414A (en) 1968-07-19 1968-07-25 Data Processing Systems
BE734986D BE734986A (en) 1968-07-19 1969-06-23
FR6921617A FR2014710A1 (en) 1968-07-19 1969-06-25
FR6921611A FR2014655A1 (en) 1968-07-19 1969-06-25
CH1062469A CH499157A (en) 1968-07-19 1969-07-11 Data processing system
JP5551269A JPS4727258B1 (en) 1968-07-25 1969-07-15
DE1966991A DE1966991C3 (en) 1968-07-19 1969-07-16 Fail-safe data processing system
DE19691936251 DE1936251C3 (en) 1968-07-25 1969-07-16 Data processing system
ES369639A ES369639A1 (en) 1968-07-19 1969-07-17 Data Processing Systems
SE10196/69A SE346170B (en) 1968-07-19 1969-07-18
NL6911126A NL6911126A (en) 1968-07-19 1969-07-18

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB34429/68A GB1163859A (en) 1968-07-19 1968-07-19 Data Processing Systems
GB35457/68A GB1168414A (en) 1968-07-19 1968-07-25 Data Processing Systems

Publications (1)

Publication Number Publication Date
GB1168414A true GB1168414A (en) 1969-10-22

Family

ID=26262285

Family Applications (2)

Application Number Title Priority Date Filing Date
GB34429/68A Expired GB1163859A (en) 1968-07-19 1968-07-19 Data Processing Systems
GB35457/68A Expired GB1168414A (en) 1968-07-19 1968-07-25 Data Processing Systems

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB34429/68A Expired GB1163859A (en) 1968-07-19 1968-07-19 Data Processing Systems

Country Status (8)

Country Link
BE (1) BE734986A (en)
CH (1) CH499157A (en)
DE (1) DE1966991C3 (en)
ES (1) ES369639A1 (en)
FR (2) FR2014655A1 (en)
GB (2) GB1163859A (en)
NL (1) NL6911126A (en)
SE (1) SE346170B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0098928A2 (en) * 1982-06-21 1984-01-25 International Business Machines Corporation Method and apparatus for logging journal data using a log write ahead data set
GB2289780A (en) * 1994-05-23 1995-11-29 Nec Corp Difference recording apparatus and method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5537641A (en) * 1978-09-08 1980-03-15 Fujitsu Ltd Synchronization system for doubled processor
GB2132796A (en) * 1982-11-25 1984-07-11 Decca Ltd Data logging system
JPS6054052A (en) * 1983-09-02 1985-03-28 Nec Corp Processing continuing system
US5155678A (en) * 1985-10-29 1992-10-13 International Business Machines Corporation Data availability in restartable data base system
US8812781B2 (en) * 2005-04-19 2014-08-19 Hewlett-Packard Development Company, L.P. External state cache for computer processor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0098928A2 (en) * 1982-06-21 1984-01-25 International Business Machines Corporation Method and apparatus for logging journal data using a log write ahead data set
EP0098928A3 (en) * 1982-06-21 1987-04-08 International Business Machines Corporation Method and apparatus for logging journal data using a log write ahead data set
GB2289780A (en) * 1994-05-23 1995-11-29 Nec Corp Difference recording apparatus and method
US5675727A (en) * 1994-05-23 1997-10-07 Nec Corporation Difference recording apparatus having a processing unit, recording unit, log update section, and log comparator using a classification key in a log of input data
GB2289780B (en) * 1994-05-23 1999-04-07 Nec Corp Difference recording apparatus and method

Also Published As

Publication number Publication date
ES369639A1 (en) 1971-04-01
DE1936251A1 (en) 1970-01-22
NL6911126A (en) 1970-01-21
GB1163859A (en) 1969-09-10
DE1966991A1 (en) 1976-02-05
CH499157A (en) 1970-11-15
DE1936251B2 (en) 1975-11-20
FR2014655A1 (en) 1970-04-17
BE734986A (en) 1969-12-01
DE1966991B2 (en) 1978-10-05
DE1966991C3 (en) 1979-05-31
FR2014710A1 (en) 1970-04-17
SE346170B (en) 1972-06-26

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee