JPS62235662A - Magnetic disk controller - Google Patents

Magnetic disk controller

Info

Publication number
JPS62235662A
JPS62235662A JP61078643A JP7864386A JPS62235662A JP S62235662 A JPS62235662 A JP S62235662A JP 61078643 A JP61078643 A JP 61078643A JP 7864386 A JP7864386 A JP 7864386A JP S62235662 A JPS62235662 A JP S62235662A
Authority
JP
Japan
Prior art keywords
data
magnetic disk
error
reading out
disk cache
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
JP61078643A
Other languages
Japanese (ja)
Inventor
Toshiaki Tazaki
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.)
NEC Corp
Original Assignee
NEC 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 NEC Corp filed Critical NEC Corp
Priority to JP61078643A priority Critical patent/JPS62235662A/en
Publication of JPS62235662A publication Critical patent/JPS62235662A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To make data release processing at a central processor unnecessary by reading out automatically the same data from a magnetic disk device, in case an error is detected at the time of reading out from a disk cache.
CONSTITUTION: When an instruction for reading out a data from a magnetic disk device 30 is outputted to a magnetic disk control device 20 from a central processor 10, an instruction interpreting and executing means 21 issues an instruction for reading out a data from a disk cache 22, to a disk cache controller 27. As a result, the data which is read out is inputted to a data selecting means 23. In such a case, when an error is detected by a disk cache error detecting circuit 24, the controller 27 reads out the same data from the magnetic disk device 30, and the data which is read out is transferred to the processor 10 through a data buffer 26, and the selecting means 23. On the other hand, in case no error is detected, the selecting means 23 transfers the data from the disk cache 22, to the processor 10.
COPYRIGHT: (C)1987,JPO&Japio
JP61078643A 1986-04-04 1986-04-04 Magnetic disk controller Pending JPS62235662A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61078643A JPS62235662A (en) 1986-04-04 1986-04-04 Magnetic disk controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61078643A JPS62235662A (en) 1986-04-04 1986-04-04 Magnetic disk controller

Publications (1)

Publication Number Publication Date
JPS62235662A true JPS62235662A (en) 1987-10-15

Family

ID=13667544

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61078643A Pending JPS62235662A (en) 1986-04-04 1986-04-04 Magnetic disk controller

Country Status (1)

Country Link
JP (1) JPS62235662A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0258138A (en) * 1988-08-24 1990-02-27 Hitachi Ltd File operating system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5341948A (en) * 1976-09-29 1978-04-15 Hitachi Ltd Information processor
JPS54106132A (en) * 1978-02-09 1979-08-20 Fujitsu Ltd Buffer memory access process system
JPS62130442A (en) * 1985-12-03 1987-06-12 Nippon Telegr & Teleph Corp <Ntt> File subsystem

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5341948A (en) * 1976-09-29 1978-04-15 Hitachi Ltd Information processor
JPS54106132A (en) * 1978-02-09 1979-08-20 Fujitsu Ltd Buffer memory access process system
JPS62130442A (en) * 1985-12-03 1987-06-12 Nippon Telegr & Teleph Corp <Ntt> File subsystem

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0258138A (en) * 1988-08-24 1990-02-27 Hitachi Ltd File operating system

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