JPH035807A - Data record input/output system - Google Patents

Abstract

PURPOSE:To reduce the burden of a host device by reading a subsequent record without the aid of the host device (central processing unit) when the record is continuously read. CONSTITUTION:An auxiliary storage device 1.2 analyzes plural subsequent records read channel commands 1.14 in a channel command analysis means 1.21, positions the subsequent record and executes a read action in a subsequent record read execution means 1.25 based on subsequent record address informa tion which a subsequent record address information storage means 1.26 stores. Since only the low-order device (auxiliary storage device) 1.2 reads the subse quent record, synchronization with a storage medium 1.3 is not lost and reading is attained at shortest time, whereby the host device (central processing unit) is prevented from analyzing address information. Thus, the burden of the host device can be reduced.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a data record input/output method.

[Conventional technology]

Conventionally, the access method that included the address information of the next record in the record was to execute the read channel program, input the record, and then re-read the channel program after the host device (central processing unit) analyzed the address information of the next record. was running. An example of the prior art is shown below using FIG. 2.

In Fig. 2, 2.1 is the central processing unit, 2.10 is the next record address analysis means, 2.11 is the reading channel program, 2.12 is the positioning channel command,
2.13 is a read channel command, 2.2 is an auxiliary storage device, 2.21 is a channel command analysis means, 2.2
2 is a channel command execution means, 2.23 is a reading channel command execution means, 2.3 is a storage medium,
2.30 is a record, 2.31 is a data record, 2.
32 is next record address information.

Referring to FIG. 2, for the auxiliary storage device 2.2, the central processing unit 2.1 has a read channel program 2.1.
Execute 1. The read channel program 2.11 consists of a positioning channel command 2.12 and a read channel command 2.13.

In the auxiliary storage device 2.2, the channel command 2.12 is analyzed by the channel command analysis means 2.21 to locate the read channel program 2.11, and the channel command execution means 2.22 stores the record 2.12 in the auxiliary storage device 2.2. Positioned at 3.0. Then read channel command 2.
13 is analyzed by the channel command analysis means 2.21, and a read operation is performed on the storage medium 2.3 by the read channel command execution means 2.23. The central processing unit 2.1 analyzes the next record address information 2.32 in the record 2.30 by the next record address analysis means 2.10, and also reads the next record address information 2.32 in order to read the next record. Then, execute the read channel program 2.11 again as many times as necessary.

[Problem to be solved by the invention]

In the conventional record reading method described above, the read channel command is executed, the host device analyzes the next record address information, and by the time the read channel program is executed again, the synchronization with the medium is lost, and there is a waste of time to regain synchronization. The drawback was that it was time consuming. Furthermore, since the address information of the next record is analyzed and a new channel program is re-executed, there is a drawback that the burden on the host device is heavy.

[Means to solve the problem]

The data record input/output method of the present invention includes an auxiliary storage device that controls input/output to data records stored in a storage medium, and a central processing unit that sends requested channel commands to the auxiliary storage device. It has a channel command analysis means for analyzing a data record, a channel command execution means for positioning a data record to execute a process, and a read channel command execution means for executing a read process for a data record, and has address information of the next record. in a data record, the next record address information reading means being called by the reading channel command execution means and reading the next record address information from the record; and the next record obtained by the next record address information reading means. Next record address information storage means for storing address information; and when a next record read channel command is requested, next record address information is obtained from the next record address information storage means and data indicating the next record address information is automatically obtained. It is constructed by providing a next record read channel command execution means for reading a record.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

First, the configuration of this embodiment will be described. In Figure 1,
1.1 is the central processing unit, 1.11 is the read channel program, 1.12 is the channel command for positioning, 1.
13 is a read channel command, 1.14 is a next record read channel command, 1.2 is an auxiliary storage device,
1.21 is a channel command analysis means, 1°22 is a channel command execution means, 1.23 is a reading channel command execution means, 1.24 is a next record address information reading execution means, 1.25 is a next record reading 1.26 is a next record address information storage means, 1.3 is a storage medium, 1.30 is a record, 1.31 is a data record, and 1.32 is next record address information.

Here, the operation of this embodiment will be explained with reference to the drawings.

Referring to FIG. 1, the central processing unit 1.1 has a read channel program 1.1 for the auxiliary storage device 1.2.
Issue 1. The read channel program 1.11 consists of a channel command (positioned as a channel command)'1.12, a read channel command 1.13, and a next record read channel command 1.14.

The auxiliary storage device 1.2 stores the read channel program 1.
The channel command 1.12 is analyzed by the channel command analysis means 1.21, and the channel command execution means 1.22 positions it in the data record 1.31. Then read channel command 1.13
is analyzed by the channel command analysis means 1°, 21,
The read channel command execution means 1.23 performs a read tree operation on the storage medium 1.3, and records 1.
．． Load 30. After that, the next record address information 1.32 is read by the record address information reading means 1.24.
Read next record address information storage means 1.26
Then, the next record address information 1.32 is stored. The auxiliary storage device 1.2 analyzes a plurality of next record read channel commands 1.14 with the channel command analysis means 1.21, and also analyzes the next record address information stored by the next record address information storage means 1.26. Then, the next record reading execution means 1.25 positions the next record and performs the reading operation.

〔Effect of the invention〕

As explained above, in the case of reading records continuously, the present invention reads the next record without intervention from a host device (central processing unit). Therefore, since the next reflex-F is read only by the lower-level device (auxiliary storage device), it can be read in the shortest possible time without losing synchronization with the medium, and the higher-level device does not have to analyze the address information. This has the effect of reducing the burden on the host device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention;
FIG. 2 is a block diagram showing an example of the configuration of a data record input/output method according to the prior art. 1.1...Central processing unit, 1.11...
・Reading channel program, 1..., 12...
- Positioning is channel command, 1.13...read channel command, 1.14...read next record channel command, 1.2...auxiliary storage, 1. 21...Channel command analysis means, 1.22...Location is channel command execution means, 1.23...Reading channel command execution means, 1.24... ...Next record address information reading means, 1.25...Next record reading ≠ Yanel command execution means, 1.26...
...Next record address information storage means, 1.3...
...Storage medium, 1,30...Record, 1゜31...Data record, 1.32...
・Next record address information.

Claims (1)

[Scope of Claims] An auxiliary storage device that controls input/output to data records stored in a storage medium, and channel command analysis means that analyzes a channel command requested from a central processing unit to the auxiliary storage device. , a data processing system including positioning channel command execution means for performing positioning processing on a data record, and read channel command execution means for performing reading processing on a data record, and including address information of a next record in the data record, a next record address information reading means that is called by the read channel command execution means and reads next record address information from the record; and a next record address information storage means that stores the next record address information obtained by the next record address information reading means. , next record read channel command execution means for obtaining next record address information from the record address information storage means and automatically reading a data record indicated by the next record address information when a next record read channel command is requested; A data record input/output method characterized by comprising: