JPS57210499A - Storage device system - Google Patents

Storage device system

Info

Publication number
JPS57210499A
JPS57210499A JP56094860A JP9486081A JPS57210499A JP S57210499 A JPS57210499 A JP S57210499A JP 56094860 A JP56094860 A JP 56094860A JP 9486081 A JP9486081 A JP 9486081A JP S57210499 A JPS57210499 A JP S57210499A
Authority
JP
Japan
Prior art keywords
data
storage devices
storage
master
slave
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
JP56094860A
Other languages
Japanese (ja)
Inventor
Takashi Kodama
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP56094860A priority Critical patent/JPS57210499A/en
Publication of JPS57210499A publication Critical patent/JPS57210499A/en
Pending 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
    • G06F11/1666—Error detection or correction of the data by redundancy in hardware where the redundant component is memory or memory area
    • G06F11/167—Error detection by comparing the memory output

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)
  • Hardware Redundancy (AREA)

Abstract

PURPOSE:To improve reliability by storing the same data in two storage devices, and regarding only a two-bit error, which occurs at the same addresses at the same time, as a fault. CONSTITUTION:One of storage devices 7A and 7B are specified as a master device, and the other is specified as a slave device; and they are switched optionall by a storage controller 5 and graphs showing the master and slave are added. For data writing, data are written in both the master and slave storage devices simultaneously, and for data reading, data are read out of the master device firstly. If a two-bit error occurs in one storage device during reading operation, a check on whether the error is an address-over error (whether the storage of data is doubled or not) is made and then the contents of both the storage devices are checked.
JP56094860A 1981-06-19 1981-06-19 Storage device system Pending JPS57210499A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56094860A JPS57210499A (en) 1981-06-19 1981-06-19 Storage device system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56094860A JPS57210499A (en) 1981-06-19 1981-06-19 Storage device system

Publications (1)

Publication Number Publication Date
JPS57210499A true JPS57210499A (en) 1982-12-24

Family

ID=14121779

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56094860A Pending JPS57210499A (en) 1981-06-19 1981-06-19 Storage device system

Country Status (1)

Country Link
JP (1) JPS57210499A (en)

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