JPS5878247A - Magnetic disc controller - Google Patents

Abstract

PURPOSE:To improve the processing capability of a channel, by connecting the channel and a disc controller again to transfer data of a buffer storage part to the channel after data on a magnetic recording medium is stored in the buffer storage part. CONSTITUTION:Commands, data, and control information are transmitted and received through a channel interface circuit part 1 of a magnetic disc controller, and a program which controls operations of respective parts of the controller is stored in a control storage part 2. The program is analyzed and executed in a controlling part 3 to control respective parts, and a data buffering storage part 4 is provided with a capacity corresponding to one maximum track for data buffering, and input/output operations and the transfer of control information are controlled by a device interface circuit part 5. A reading position is determined in the storage part 2 by position information from the circuit part 1, and data of the storage part 2 is stored in the storage part 4, and thereafter, the circuit part 1 and the circuit part 5 are connected again by the control of the controlling part 3, and data of the storage part 4 is transferred to the circuit part 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic disk control device,
41, there is 40f concerning the control device for displaying the data that is required on the nine-magnetic recording system, which was instructed in Pandalam.

Conventionally, the ζ0IIO data control device is a magnetic recorder.
Body of-pt appearance f field 4r, sK] [-8 to 'r81
COTO! l-81CAROH-READ () :x
q y )" 7 v 4 wo W) Make it negative to the cloak chain and attach it to the necessary data.

Below is 1 above =! The operation of the magnetic disk drive control device and the magnetic disk drive storage device of a pigeon coop that collects a wind array will be explained.

8KKK
, the is-key disk controller issues a head movement instruction to the magnetic disk storage device and releases the 9IIK channel and O connection state. After that, the 0 head 0 movement completion signal from the magnetic disk storage device is detected by the magnetic disk control device, and the 5i
In order to report the completion of the cu command 0, a reconnection request is sent to the KLIKIDISTA control device channel. When the channel accepts the reconnection request, the magnetic disk control station is 5l.
CIcK will report the completion of yPO and accept the mantle of 81CT J31COTORl according to the command chain instructions of the channel. The magnetic disk control device receives the positioning sector number from the channel, sets the data to the magnetic disk storage device, and then releases the channel wedge O connection state again. Then from the magnetic disk storage device O*
The magnetic disk control device detects the Tata Shoki signal, and the 8
KT 8KO'rOR command e issues a reconnection request to the magnetic disk controller (magnetic disk controller) channel to report completion.

When the channel accepts the connection request, the magnetic disk controller reports the end of the 8KT 81COTOR=rl cloak, and in accordance with the command chain instructions of the channel, the magnetic disk controller
The magnetic disk controller receives the KAROH: l cloak, and repeats the 5EARCH command when the record identifier on the magnetic recording medium matches the data transferred from the channel. Then, the data on the magnetic recording medium is transferred to the channel. To supplement the above explanation, FIG. 1 shows a time chart showing the state in which the channel, magnetic disk control device, and magnetic disk storage number are in use.

5EEK command in case of ζO control system.

SET 5iCCTOR=y Occurrence of wasted time due to the reconnection sequence processing O from the magnetic disk controller to the channel for the completion report of the cloak.In particular, at point B in the time chart above, the sector number from the magnetic disk storage device - If the channel response to a reconnection request from one magnetic data storage controller is slow because the contract is valid only for a limited time, there is a drawback that the rotation waiting time of the magnetic recording medium becomes long.

9, 81CAR(3H:y w 7 )' Oml
In the row, the channel and the magnetic disk controller are in use at the stage where the record identifiers match, and 1
One magnetic disk controller occupies the channel.

Therefore, until valid data on the magnetic recording medium is transferred to the channel, there are many logical connections between the channel and the magnetic disk controller, which tends to reduce the processing capacity of the channel.

The present invention has been devised to solve the above-mentioned drawbacks of the conventional technology, and it is therefore an object of the present invention to report the status of channels and magnetic disk control devices without changing the channel program specifications of the conventional Ol & Disk control device. By minimizing the sequence for transferring data on the magnetic recording medium to the channel and eliminating unnecessary data transfer between the channel, magnetic disk, and control device due to the depth of the 5TIARCH command, Nine new magnetic disk systems that reduce the logical connectivity of disk controllers and increase channel processing capacity.
The goal is to provide equipment.

The above object of the present invention is to provide a channel interface circuit section, a control storage section, a control section, a data buffer storage section,
When reading data on a magnetic recording medium, the magnetic disk control unit preempts the position information necessary for access from the channel and connects the channel and the magnetic disk control device. Based on the position information transferred from the channel, the reading head of the magnetic disk storage space is positioned at the position specified by the channel, and the data on the magnetic recording medium is stored in the data buffer storage section. This is achieved by a magnetic disk controller, which then reconnects the channel and the magnetic disk controller to transfer the data in the data buffer storage section to the channel.

Next, a preferred embodiment of the present invention will be explained in detail with reference to the drawings.

No. JwA is a functional block configuration diagram showing an embodiment of a magnetic disk control device according to the present invention. An embodiment of the present invention includes commands, data, and control information.

A channel interface circuit section I that sends and receives status information to and from the channel, a control storage section I that stores microprograms that control the operations of each section of the magnetic disk control device, and also stores various control information, analysis of the microprograms, Control s3 performs execution and controls the device stand; controls 4 data buffer storage sections with a capacity of up to 2 tranns for buffering data from the magnetic disk storage device under the control of the microprogram Under the control of the microprogram in the storage unit, the magnetic disk storage device and O
A device interface circuit section S, which controls input/output operations and transfer of control information, is configured at the interface. In Figure 1, solid lines indicate data flow, and dotted lines indicate control information and control signals.

The magnetic disk controller executes the 5EEK command from the channel to set the attack number and head number to 8KT.
8K(:'rOR* v By executing the command, the sector number is written, and by executing the 5TLARCH command, the working record identifier is written to the control table in the control storage unit as data access information on the magnetic recording medium.

Store in correspondence with the address of the disk storage number location. In this case, under the control of the microprogram, only the channel interface circuit section 1 and the control 11JO are used to operate between the channel and the magnetic disk controller.

bR that actually transfers the data on the magnetic recording medium to the channel
When the EAD command is transferred from the channel, the magnetic disk controller reports the retry status to the channel and releases the O-wire connection between the channel and the magnetic disk control station.

Thereafter, the magnetic disk drive controller activates a seek operation for the magnetic disk drive using the control storage section O data access information. Set the magnetic disk control number, detect the end of the O seek operation from the magnetic disk storage device, then read the sector number as data access information and set it in the magnetic disk storage device, and read the sector number from the magnetic disk storage device. 8KICK waits for consistent signal
= During a seek operation in the magnetic disk storage device due to the y mantle, the O11 transfer wait time with the SET 81COTOR command is the same as in the conventional magnetic disk control device, and the K1m disk control device is in an idle state and the Orun address is not transferred from the channel. O *Requests for magnetic disk storage devices can be accepted.

The magnetic disk controller controls O from the magnetic disk storage number position.
- When a coincidence signal is detected, an operation is started to read the data on the magnetic recording medium. The magnetic disk controller compares the record identifier transferred from the magnetic disk storage unit with the O record identifier in the data access information previously transferred via the channel 81CAROH:5, and determines that the comparison matches. Then, the operation for storing the subsequent data from the magnetic disk storage device in the data buffer storage section IIK is started. If the comparison does not match, the process executes the next record and continues the operation at the end of the comparison.

The operation of storing data from the magnetic disk storage number in the data buffer storage 11I is performed when the index data is detected, and when the index data is detected and the magnetic disk storage controller starts storing data in the data buffer storage 11I. A logical index pattern is written in the data buffer storage section.A gear rough is used to classify the records on the magnetic record. It only stores data.

If a correctable reading error occurs, the data in the data buffer storage is corrected based on the code.

At this point, the magnetic disk controller issues a reconnection request to the channel, receives the RIEAD from the channel, reads the data from the data buffer storage unit, and transfers it to the channel. Sur,
5TLlcK: Cylinder/head number does not change due to Fi/Do data pad 7A It is possible to execute commands from the channel using data in the storage section.

The third HVC shows a state in which the channel, magnetic disk control device, and magnetic disk storage space are in use during execution of the 7-command array in this method.

As explained above, according to the present invention, the 5EEK
7)', 81CT 8KGTOR:l-ty
It eliminates the need for reconnection sequence processing for reporting the completion of data transfer, eliminates the rotational wait time due to the 8iCT 5RCTOR code, and eliminates unnecessary data between the channel and the magnetic disk controller using the Sv...OH command. If a correctable read 11L query is likely to occur, use the data in the data buffer storage to correct the erroneous data and transfer the correct data to the channel for data correction. Eliminates the need for noatware intervention.

As is clear from the 5th WA, after the channel continuously sends the data access information on the magnetic recording medium to the magnetic disk drive controller, the necessary data is prepared in the data buffer storage section of the magnetic disk drive controller. The load for channel input/output control is greatly reduced as the channel remains in a wait state until it reaches its final state.

As described above, the present invention has the effect of significantly reducing the logical state of the channel and the magnetic disk drive control system and increasing the processing capacity of the channel without changing the conventional channel program.

The present invention has been described above with reference to one preferred embodiment thereof.
It is for illustrative purposes only and is explained here.
Of course, the present invention is not limited only to the K vagina example.

[Brief explanation of the drawing]

Figure 1 shows a channel using this type of quadratic technique. Magnetic disk storage control an, time chart showing the state in which the magnetic disk storage device is in use, Figure 1 is a block diagram showing an embodiment of the magnetic disk storage control device according to the present invention, Figure 2 is a case according to the present invention 3 is a time chart showing a state in which an O channel, a magnetic disk control device, and a magnetic disk storage device are in use. l...Channel interface circuit unit, 1...Control storage unit, J...Control unit, D...Data buffer storage unit! ...Device interface aSS. Agent Yutabe Kumagai, patent attorney

Claims (1)

[Claims] Commands, data, control information, and status information are sent to channels and 0
A control storage section that stores the miter information that controls the operation of each part of the magnetic disc control device, and a control storage section that stores the miter four pudatum O that controls the operation of each part of the magnetic disc control device. a control section; a data buffer storage section for performing magnetic disk storage eccentricity and buffering of O data between the magnetic disk control devices; Since it has a device interface-tread section that controls input/output operations and transmission of control information between the magnetic disk storage device and the magnetic disk storage device under the control of the magnetic disk drive control device, the magnetic disk storage device IIIK, which reads out the data on the plot, quickly accesses the VCTo* position in advance of the channel, and controls the channel and the 1st data controller O.
disconnect the connection, position the magnetic disk recording head (based on the transfer position information of the channel), and store the data on the magnetic disk in the data buffer storage section. After that, the channel and the magnetic disk controller are reconnected and the data in the data buffer storage section is transferred to the channel.