JPS55134465A - Recovery system in system having external memory unit - Google Patents

Recovery system in system having external memory unit

Info

Publication number
JPS55134465A
JPS55134465A JP4089579A JP4089579A JPS55134465A JP S55134465 A JPS55134465 A JP S55134465A JP 4089579 A JP4089579 A JP 4089579A JP 4089579 A JP4089579 A JP 4089579A JP S55134465 A JPS55134465 A JP S55134465A
Authority
JP
Japan
Prior art keywords
information
fault
memory unit
common information
external memory
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.)
Pending
Application number
JP4089579A
Other languages
Japanese (ja)
Inventor
Yukio Sato
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP4089579A priority Critical patent/JPS55134465A/en
Publication of JPS55134465A publication Critical patent/JPS55134465A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To make it possible to recover the system smoothly at a system down time, by reporting a fault in common information if the fault exists and stopping information saving when common information is periodically saved into an external memory unit.
CONSTITUTION: A system is constituted by main memory unit 10, external memory unit 30 and I/O terminals 21 and 22. Common information 40 which becomes a key for the whole of the system is constituted by initial value status 41 indicating the initial value of common information and plural key constants 42 to decide a fault of common information, and information 40 is saved into unit 30 only when status 41 is not the initial value and plural constants 42 are not broken in the processing module where common information is periodically saved. In case that one or more constants 42 are broken, it is decided that a fault occurs in information 40, and the fault is reported, and information saving is stopped, and information 40 saved previously is secured, so that the system can be recovered smoothly.
COPYRIGHT: (C)1980,JPO&Japio
JP4089579A 1979-04-06 1979-04-06 Recovery system in system having external memory unit Pending JPS55134465A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4089579A JPS55134465A (en) 1979-04-06 1979-04-06 Recovery system in system having external memory unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4089579A JPS55134465A (en) 1979-04-06 1979-04-06 Recovery system in system having external memory unit

Publications (1)

Publication Number Publication Date
JPS55134465A true JPS55134465A (en) 1980-10-20

Family

ID=12593239

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4089579A Pending JPS55134465A (en) 1979-04-06 1979-04-06 Recovery system in system having external memory unit

Country Status (1)

Country Link
JP (1) JPS55134465A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982001958A1 (en) * 1980-11-28 1982-06-10 Kinoshita Mitsuo Data rewriting system for bubble memory
JPH04263347A (en) * 1991-02-18 1992-09-18 Nec Corp Reliability improving device for operation setting information

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1982001958A1 (en) * 1980-11-28 1982-06-10 Kinoshita Mitsuo Data rewriting system for bubble memory
US4493083A (en) * 1980-11-28 1985-01-08 Fanuc Ltd. System for updating data in bubble memories
JPH04263347A (en) * 1991-02-18 1992-09-18 Nec Corp Reliability improving device for operation setting information

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