JPS5917653A - Method for transferring data of magnetic disc controlling device - Google Patents

Method for transferring data of magnetic disc controlling device

Info

Publication number
JPS5917653A
JPS5917653A JP57127976A JP12797682A JPS5917653A JP S5917653 A JPS5917653 A JP S5917653A JP 57127976 A JP57127976 A JP 57127976A JP 12797682 A JP12797682 A JP 12797682A JP S5917653 A JPS5917653 A JP S5917653A
Authority
JP
Japan
Prior art keywords
data
error
buffer memory
host device
magnetic disk
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
JP57127976A
Other languages
Japanese (ja)
Inventor
Hitoshi Matsushima
松島　等
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP57127976A priority Critical patent/JPS5917653A/en
Publication of JPS5917653A publication Critical patent/JPS5917653A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)

Abstract

PURPOSE:To perform retrying efficiently at the generation of an error by incorporating a buffer memory to store data of one block in a fixed length magnetic disc controlling device and executing error check before the transfer of data to a host device. CONSTITUTION:When an error is not detected at the storage of data of one block in a buffer memory 8, an error detecting circuit 7 opens a gate 9 and transfers data in the buffer memory 8 to a buffer memory 10. After storage of data in the buffer memory 10, a channel interface 11 transfers data to the host device. If an error is detected by an error detecting circuit 7, the error detecting circuit 7 interrupts to open the gate 9 and inhibits the transfer of the data in the buffer memory 8 to a buffer memory 10. Consequently, the host device is released from retrying due to the generation of the error, so that the efficiency of an information processing system is prevented from reduction.

Description

【発明の詳細な説明】 （ａ）　　発明の技術分野 本発明は磁気ディスク制御装置に係り、特に固定長磁気
ディスク装置と上位装置とのデータ転送用にデータバッ
ファ機能をもたせ上位装置に読出したデータを送出する
以前にエラーチェックを行なう磁気ディスク制御装置の
データ転送方式に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a magnetic disk control device, and in particular has a data buffer function for data transfer between a fixed-length magnetic disk device and a host device to transfer data read to the host device. The present invention relates to a data transfer method for a magnetic disk control device that performs error checking before sending data.

（ｂ）　　従来技術と問題点 第１図は磁気ディスクサブシステムの構成例を示す。(b) Conventional technology and problems FIG. 1 shows an example of the configuration of a magnetic disk subsystem.

上位装置１は中央処理装置ＣＰＵとチャンネルに大別さ
れる。固定長磁気ディスク制御装置２はアダプタ３を経
て固定長磁気ディスク装置４又は５を制御し、上位装置
１と固定長磁気ディスク装置４又は５とのデータ転送を
行なう。The host device 1 is roughly divided into a central processing unit CPU and channels. The fixed length magnetic disk control device 2 controls the fixed length magnetic disk device 4 or 5 via the adapter 3, and performs data transfer between the host device 1 and the fixed length magnetic disk device 4 or 5.

従来の固定長磁気ディスク装置４又は５と上位装置１と
の間のデータ転送は固定長磁気ディスク装置４又は５よ
シアダプタ３及び固定長磁気ディスク制御装置２を経由
して直接上位装置１に転送されるため、エラーが検出さ
れた時点では該轟するデータのブロックは既に上位装置
１に転送済となっている。従ってリトライ処理は上位装
置１に格納されているＯ８（オペレーテングシステム）
の管理下で該轟ブロックのデータの消去を伴う複雑な処
理を必要とし、情報処理システムの中央処理装置ＣＰＵ
が介入するためシステム全体の効率を低下させる欠点が
ある。Data transfer between the conventional fixed-length magnetic disk device 4 or 5 and the host device 1 is directly transferred from the fixed-length magnetic disk device 4 or 5 to the host device 1 via the shear adapter 3 and the fixed-length magnetic disk controller 2. Therefore, at the time the error is detected, the block of data that is causing the crash has already been transferred to the host device 1. Therefore, retry processing is performed by O8 (operating system) stored in host device 1.
requires complex processing involving erasing data in the Todoroki block under the control of the central processing unit CPU of the information processing system.
has the disadvantage of reducing the efficiency of the entire system.

（Ｃ）　　発明の目的 本発明の目的は上記欠点を除くため、固定長磁気ディス
ク制御装置内に１ブロック分のデータを記憶し得るバッ
ファメモリを設け、固定長磁気ディスク装置より１ブロ
ック分のデータの転送を先行させ、上位装置にデータの
転送を行なう以前にエラーチェックを行なうことにより
、エラー発生時のＩＩ　）ライ処理を効率良く行なう固
定長磁気ディスク制御装置のデータ転送方式を提供する
ことにある。(C) Purpose of the Invention An object of the present invention is to eliminate the above-mentioned drawbacks by providing a buffer memory capable of storing one block of data in a fixed-length magnetic disk controller, and storing one block of data from the fixed-length magnetic disk device. To provide a data transfer method for a fixed-length magnetic disk controller that efficiently performs 2) write processing when an error occurs by prioritizing data transfer and performing an error check before transferring data to a host device. be.

（ｄ）　　発明の構成 本発明の構成は固定長磁気ディスク制御装置に於て、１
ブロック分のデータを記憶する手段と。(d) Configuration of the Invention The configuration of the present invention includes: 1.
A means for storing blocks of data.

固定長磁気ディスク装置より読出されたデータのエラー
検出手段とを設け、上位装置に該読出されたデータを転
送する前に、該データのエラーチェックを行なって前記
１ブロック分のデータ記憶手段に記憶させ、エラーが検
出されぬ場合上位装置に該データを転送し、エラーが検
出された場合該データの転送を禁止するようにしたもの
である。error detection means for data read from the fixed-length magnetic disk device, and before transferring the read data to a host device, performs an error check on the data and stores it in the data storage means for one block. If no error is detected, the data is transferred to the host device, and if an error is detected, the data is prohibited from being transferred.

（ｅ）発明の実施例 第２図は本発明の一実施例を示す回路のブロック図であ
る。固定長磁気ディスク制御装置は上位装置からデータ
転送要求が来るとデバイスインタフェース６を先行させ
、固定長磁気ディスク装置の該当ブロックよりデータを
読出させる。該読出されたデータはデバイスインタフェ
ース６に入り。(e) Embodiment of the Invention FIG. 2 is a block diagram of a circuit showing an embodiment of the invention. When a data transfer request is received from a host device, the fixed-length magnetic disk controller causes the device interface 6 to read data from the corresponding block of the fixed-length magnetic disk device. The read data enters the device interface 6.

エラー検出回路７によりエラーチェックを受けると共に
バッファメモリ８に格納される。１ブロック分のデータ
がバッファメモリ８に格納された時点でエラー検出がな
ければエラー検出回路７はゲート９を開いてバッファメ
モリ８のデータをバッファメモリ１０に移す。バッファ
メモリ１０にデータが格納されたことによりチャンネル
インタフェース１１は上位装置に該データを転送する。The data is subjected to an error check by the error detection circuit 7 and stored in the buffer memory 8. If no error is detected when one block of data is stored in the buffer memory 8, the error detection circuit 7 opens the gate 9 and transfers the data in the buffer memory 8 to the buffer memory 10. With the data stored in the buffer memory 10, the channel interface 11 transfers the data to the host device.

若しエラー検出回路７によりエラーが検出されるとエラ
ー検出回路７はゲート９を開かずバッファメモリ８のデ
ータがバッファメモリ１０へ移さ３− れることを禁止する。固定長磁気ディスク制御装置はエ
ラー検出回路７のエラー報告により固定長磁気ディスク
装置を制御し該当ブロックにへ、ドをアクセスしりトラ
イを行がう。If an error is detected by the error detection circuit 7, the error detection circuit 7 does not open the gate 9 and prohibits the data in the buffer memory 8 from being transferred to the buffer memory 10. The fixed length magnetic disk control device controls the fixed length magnetic disk device based on the error report from the error detection circuit 7, and tries to access the corresponding block.

（ｆ）　　発明の詳細 な説明した如く本発明はエラーの発生したブロックのデ
ータは上位装置に転送されず、リトライも固定長磁気デ
ィスク制御装置が行うため上位装置はエラー発生に伴う
ＩＪ　）ライ動作から解放されるので情報処理システム
の効率を低下させることがなく、その効果は大なるもの
がある。(f) As described in detail, in the present invention, the data in the block where the error occurred is not transferred to the host device, and the retry is performed by the fixed-length magnetic disk control device, so the host device performs the IJ) write operation in response to the error occurrence. The efficiency of the information processing system is not reduced, and the effect is great.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は磁気ディスクサブシステムの構成例を示す図、
第２図は本発明の一実施例を示す回路のブロック図であ
る。 １は上位装置、　　２Ｈ固定長磁気ディスク制御装置、
３はアダプタ、４．５は固定長磁気ディスク族！、、６
はデバイスインタフェース、７はエラー検出回路、８．
１０はバッファメモリ、９はゲー）、ｌ１ｌ−９ヤンネ
ルイソダツ゛エニスでアル。 ４− も１図FIG. 1 is a diagram showing an example of the configuration of a magnetic disk subsystem.
FIG. 2 is a block diagram of a circuit showing one embodiment of the present invention. 1 is a host device, 2H fixed length magnetic disk control device,
3 is an adapter, 4.5 is a fixed length magnetic disk family! ,,6
7 is a device interface, 7 is an error detection circuit, and 8.
10 is a buffer memory, 9 is a game), and 111-9 is a buffer memory. 4- Figure 1

Claims (1)

【特許請求の範囲】[Claims] 磁気ディスク制御装置に於て、１ブロック分のデータを
記憶する手段と、磁気ディスク装置より読出されたデー
タのエラー検出手段とを設け、上位装置に該読出された
データを転送する前に、該データのエラーチェックを行
って前記１ブロック分のデータ記憶手段に記憶させ、エ
ラーが検出されぬ場合上位装置に該データを転送し、エ
ラーが検出された場合該データの転送を禁止することを
特徴とする磁気ディスク制御装置のデータ転送方式。A magnetic disk control device is provided with means for storing data for one block and means for detecting errors in data read from the magnetic disk device, and detects errors in the read data before transferring the read data to a host device. The data is checked for errors and stored in the data storage means for one block, and if no error is detected, the data is transferred to a host device, and if an error is detected, transfer of the data is prohibited. A data transfer method for magnetic disk controllers.
JP57127976A 1982-07-22 1982-07-22 Method for transferring data of magnetic disc controlling device Pending JPS5917653A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57127976A JPS5917653A (en) 1982-07-22 1982-07-22 Method for transferring data of magnetic disc controlling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57127976A JPS5917653A (en) 1982-07-22 1982-07-22 Method for transferring data of magnetic disc controlling device

Publications (1)

Publication Number Publication Date
JPS5917653A true JPS5917653A (en) 1984-01-28

Family

ID=14973347

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57127976A Pending JPS5917653A (en) 1982-07-22 1982-07-22 Method for transferring data of magnetic disc controlling device

Country Status (1)

Country Link
JP (1) JPS5917653A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6020237A (en) * 1983-07-14 1985-02-01 Nec Corp Disk controller
JPS6158033A (en) * 1984-08-29 1986-03-25 Fuji Electric Co Ltd Disc controller
JPH01315819A (en) * 1988-06-15 1989-12-20 Nec Corp Optical disk controller
US5096033A (en) * 1991-01-17 1992-03-17 Grand Haven Stamped Products Company Lockout mechanism and system for vehicle shifter
US5167308A (en) * 1991-01-17 1992-12-01 Grand Haven Stamped Products, Div. Of Jsj Corporation Combination brake/park lockout and steering mechanism and system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS499222A (en) * 1972-05-12 1974-01-26

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS499222A (en) * 1972-05-12 1974-01-26

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6020237A (en) * 1983-07-14 1985-02-01 Nec Corp Disk controller
JPS6158033A (en) * 1984-08-29 1986-03-25 Fuji Electric Co Ltd Disc controller
JPH053612B2 (en) * 1984-08-29 1993-01-18 Fuji Denki Kk
JPH01315819A (en) * 1988-06-15 1989-12-20 Nec Corp Optical disk controller
US5096033A (en) * 1991-01-17 1992-03-17 Grand Haven Stamped Products Company Lockout mechanism and system for vehicle shifter
US5167308A (en) * 1991-01-17 1992-12-01 Grand Haven Stamped Products, Div. Of Jsj Corporation Combination brake/park lockout and steering mechanism and system

Similar Documents

Publication Publication Date Title
JP2855019B2 (en) External storage device data guarantee method and external storage device
US4523275A (en) Cache/disk subsystem with floating entry
JPS5917653A (en) Method for transferring data of magnetic disc controlling device
US6535953B1 (en) Magnetic disk, method of accessing magnetic disk device, and recording medium storing disk access control program for magnetic disk device
US6088818A (en) Data read apparatus and data read method
JPH02186424A (en) Disk control circuit
JPS6347937Y2 (en)
JPH0281224A (en) Backup device for magnetic disk device
JP3262130B2 (en) Information processing device
JPS58223860A (en) Magnetic disk controller
JP4499909B2 (en) Multiplexed storage controller
JP2732951B2 (en) Data transfer control method
JPS58114152A (en) Back up device for magnetic disc
JPS6225337A (en) Retrial control method
JPS60144833A (en) Data storage processor
JPH05158627A (en) Disk device
JPS6070571A (en) Detection of overrun of disc device
JPS6230668B2 (en)
JPH0122656B2 (en)
JPH0820934B2 (en) Disk cache control method
JPS59112353A (en) Data reading out system from recording medium
JPH04341977A (en) Data reproducing control system
JPH02210672A (en) Data writing error detector
JPS61194552A (en) Error control of a memory
JPH07210321A (en) Disk controller