JPH03204023A - Duplexing control system for magnetic recorder - Google Patents

Abstract

PURPOSE:To easily attain the duplex write processing by processing a 1st magnetic recorder with a write command and applying the write processing to a 2nd magnetic recorder with a copy command linked to the relevant write command. CONSTITUTION:A SCSI control channel 12 receives a write command to a magnetic disk device (I) from a main storage 11 of a host device 10. When the final bit of the write command is defined as a link graph and set at '1', the linkage of a copy command is shown. This copy command is issued to the device (I) and the write processing is carried out by an I/O controller 13. Then a copy command is issued to the device (I) when the write processing is ended. Thus the copy processing is carried out to the copy destination address designated by the copy command, i.e., to a magnetic disk device (II). Then the duplexing control of the write processing is ended with the end of the copy processing. Thus, the duplexing control is attained with high efficiency to the magnetic recorder.

Description

[Detailed Description of the Invention] [Summary] Regarding a redundant control system for magnetic recording 5lii write processing in a computer system where common commands can be conveniently used, write processing for two magnetic recording devices is performed in one bus acquisition process. In order to perform write processing on two magnetic recording devices, first, the first magnetic recording device is processed with a write command, and the copy linked to the command is The second magnetic recording device is configured to be trap-controlled to perform write processing in response to a command.

[Industrial application field]

This invention relates to a redundant control system for magnetic recording device write processing in a computer system that can use common commands.

[Conventional technology]

Conventionally, computer systems have used systems that include an interface that supplies and controls common commands without depending on the attributes of various peripheral devices.

SC3I (S%all Com%tar Sl
agavm Intarftxam) is one type of this kind of interface,
This is a peripheral device ll connection interface for small systems standardized by I).

5C3I bus has circuit condition selection L■, maximum 4MByt
It is a bus that can realize data transfer up to a second. An important feature of this interface is that each peripheral device can be classified into several types, and within the same type, a system that does not depend on the attributes of each peripheral device can be provided to the host computer. Rounding off this objective, the 5C3I provides common commands for all peripherals within the same type. This common command can be used to connect various disk devices, tape devices, printers, communication devices, etc. to the host system's hardware,
Additions, mixes, upgrades, and replacements can be made without or with minimal software modification.

On the other hand, in 5C3I, it is also possible to add commands and functions that take A-type into consideration.

In a system with a 5C8I bus, a conventional method of redundant control in which the same content is written to two magnetic disk devices as a groove path device using a common write command f:
Shown in Figure ig6. In the figure, when performing single-duplex writing of data sequentially output from the main memory 11 to two magnetic disk devices 15 and 16 via the 5CSI control channel 12 under the control of the host device 10, first the host device 1I110 After issuing a write command to device (I) 15 and completing the process, write to magnetic disk device (1) 1.
6 issues the same write command and processes it.

[Problem to be solved by the invention]

In the conventional duplexing method described above in which write processing is performed on two magnetic disk devices, the host device 10 writes data to the magnetic disk device (I) 15 and the magnetic disk device (If) 16.
Since a write command is issued for each, processing to acquire each bus is required, which complicates the processing procedure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a redundant control system that performs write processing for two a-memory devices in one bus acquisition process.

[Means to solve the problem]

In order to achieve the above objective, as shown in the principle explanatory diagram of FIG. To perform the processing, first, the first magnetic recording device 15 is controlled to process with a write command (2), and the second magnetic recording device 16 (t) is controlled to perform a write process with a copy command (3) linked to the command. .

[For production]

For example, the data from the host device is sent to the magnetic recording device f(I)15/c write command via the 5C3I control channel 12! 1. VC-linked copy 1172011 is sent when the bus is acquired, and after the write command (2) is completed, the processing of the copy command (3) is performed on the magnetic recording device (16).

〔Example〕

FIG. 2 is an explanatory diagram of the configuration of the embodiment, and FIG. 3 is a flowchart showing its operation.

In FIG. 2, data in the main memory 11 is output under the control of the host system fi10, and sent to two magnetic disk drives via the 5C3I control channel 12 and the 5C8I bus.
The magnetic disk drives (1) 15.
Send a write command ■ to I) (ID=0) After the write process is completed, send a copy command ■ through the same bus, and transfer the copied data to the disk device (I) 16 (ID=
Send to 1) and perform write processing.

FIG. 3 is a flowchart showing the operation of the embodiment.

In the same figure, the main memory 11 to 5 of the host device ff1110
The C3I control channel 12 is connected to the magnetic disk family ff1i (
I) Receive a write command for K. The last bit of this write command is LINK 7 lag, and when it is "1", it indicates that the copy commands are connected. This is issued to the magnetic disk group #(■), the target controller 13) executes the write process, and when the write process is completed, a copy command is issued to the magnetic disk unit CI), and the data specified in the copy command is the copy destination address, that is, the magnetic disk device (υ
Copy processing is executed for the data, and when the copy processing is completed, the dual control of write and write processing is completed.

FIG. 4 shows an example of a write command that is conveniently used in the embodiment. As a write request from the host device 10 to the magnetic disk device (1) 15, the command code ■ (2A in hexadecimal), logical block address A, and transfer block number B are sent.
It consists of 10 bytes including t- and LI at the end of the last byte.
NK 7 lag@ is added, indicating that it is connected to the Sicobee command.

The 5th ffl(α), (6) shows the command ■ of the copy command and the parameter 0 connected to it.
) and the related parameter list length ■ (q to 19 with 16 interrupts), a LINK7 lag ■ is added to the end of the last byte, and from this K the parameter ○
Indicates that it is connected to.

Parameter 0 indicates a different content of the parameter in the command ■, and is code 6 (11 in hexadecimal) indicating copy between magnetic disk devices (r, i).
It consists of 20 bytes consisting of the code (1) and [F] specifying the ID of the magnetic disk (I), (1), the number of transfer blocks B, and the logical block address of the source and copy (both A).

This indicates that the contents of the magnetic disk drive (I) are to be copied to the magnetic disk drive (ff).

The present invention is applicable not only to magnetic disks but also to magnetic recording devices such as magnetic drums.

〔Effect of the invention〕

As explained above, according to the present invention, by acquiring the 5C3I bus to the first magnetic recording device and then following the copy command to the second magnetic recording device linked to the termination thereof, Duplicate write processing can be easily realized, and duplex control of magnetic recording devices, which has recently been in high demand, can be realized with high efficiency.

[Brief explanation of drawings]

Fig. 1 is a detailed explanatory diagram of the present invention, Fig. 2 is an explanatory diagram of the configuration of the embodiment, Fig. 3 is a flowchart showing the operation of the embodiment, Fig. 4 is an example of a write command, fas diagram (g), ( &) is a copy command, and Figure 6 is an explanatory diagram of a conventional example.
0 is a host device, 11 is a main memory, 12 is a 5C3I control channel, 13.14 is a Vo controller/controller, and 15° and 16 are magnetic recording (disk) devices. Figure 1, explanatory diagram of the principle of the present invention

Claims (1)

[Claims] In a computer system using an interface that can connect various peripheral devices using a common command, in order to perform write processing on two magnetic recording devices, first, a first magnetic recording device is written using a write command. A duplex control method for a magnetic recording device, characterized in that a second magnetic recording device is controlled to perform a write process using a copy command linked to the command.