JPS616756A - Securing method of area - Google Patents

Abstract

PURPOSE:To secure a data storing area easily by forming a device table in a data control part, retrieving the device table and securing a required data storing area in a direct access device. CONSTITUTION:The device table 52 is formed in the data control part 51 and the ability of the device, i.e. the capacity of storage, is written on the device table 52 in each type of DASD machine. On the other hand, a code area indicating the type of the DASD machine is formed in a control sentence of input data to regulate the type of the machine. The data control part 51 reads out the code, retrieves the device table 52 and controls the area on the basis of the storage capacity element of the type of the machine to be answered.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an area reservation method for a direct access device connected to a data processing device.

(a) Industrial Application Fields Many direct access devices are used in data processing device systems because they allow direct access to data and are convenient. These direct access devices have different functions and storage capacities depending on the model. Therefore, when setting up a data processing system, the required model is selected and the system is configured.

(bl) A conventional technology data processing device system is configured as shown in FIG. This input data 1 is read by the reader 3,
The contents are input to the spool volume 4. The data processing device 5 interprets the contents of the spool volume 4 using the data management unit 51 and manages the DASD 2 according to the control statement.

(The problem that the C1 invention aims to solve) Therefore, if you want to change the DASD to a high-speed one or a large-capacity one in order to increase the processing capacity of a data processing system, change the input data control statement to the corresponding new one. It is necessary to change the model.

The present invention proposes a method that does not require the creation of control statements when changing DASD models.

(dl Means for Solving the Problems) This proposal provides a data processing device that manages the area of direct access devices, includes a device table in the data management section of the data processing device, and stores the name of the direct access device in the device table. The device table is searched by specifying the model of the direct access device to be used, and the required data storage area is secured in the direct access device using the storage capacity element.

(e) In other words, the data management unit of the data processing device is equipped with a control table that describes elements indicating storage capacity for each wholesale SD model, and the control table is searched based on the DASD name of the input data and the data is stored based on the storage capacity element. It manages the storage area.

Therefore, it is not necessary to change the control statement when changing the model.

(fl Example Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the area securing method according to the present invention. The same parts as in Fig. 2 are given the same reference numerals.

A feature of the present invention is that a device table 52 is attached to the data management section 51, and this device table 52 includes DAS
As shown in the figure, for each D model, elements indicating the device capacity, that is, the storage capacity are described. That is, storage capacity elements, for example, the number of trunks per cylinder of DASD-A is 10, the capacity (number of bytes) per track is 10,000, and DASD-H
The number of trunks per cylinder is 301, and the capacity per trunk is 30,000.

On the other hand, a code area indicating the DASDIJM type is provided in the control statement of the input data to define the model. The data management unit 51 reads the code, searches the device table, and manages the area based on the storage capacity element of the responding model.

Assume that there are 10 cylinders of data to be managed using 0^SD-B. The required storage capacity is 10X
It is 30 x 30000 bytes. This DASD-B
When converted to DASD-8, 10 x 30 x 30
000 ÷ 10000 = 900 trunk storage area DA
Required for SD-A.

The above calculation is performed by the data management unit 51, and area reservation is performed.

(gl Effects of the Invention As is clear from the above explanation, the method for securing an area according to the present invention makes it possible to easily change the device model by specifying the name of the device to be used. It has the advantage that area can be easily secured.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of a method for securing an area according to the present invention, and FIG. 2 is a block diagram for explaining a conventional method for securing an area. In the figure, 2 is a DASD, 4 is a spool volume, 5 is a data processing device, 51 is a data management unit, and 52 is a device table. Figure 1 Figure 2

Claims (1)

[Claims] In a data processing device that manages the area of a direct access device, a data management unit of the data processing device includes a device table, and the device table records the direct access device name and an element indicating the storage capacity, and the direct access device used is A method for securing an area, characterized in that the device table is searched by specifying a device model, and a required data storage area is secured in the direct access device using the storage capacity element.