JPH04372026A - Data set generation management system - Google Patents

Abstract

PURPOSE:To secure normal data sets of preservative generations even when the reserve generation of illegal data sets are prepared by managing the upper limits of the generations of preserved data set while being divided into the preservative and reserve generation numbers in the data processing system equipped with the generation management system capable of preserving the data sets of the constant generations on the outer storage device comprising the computer system. CONSTITUTION:The data set generation management system is provided with a generation data set management book 106, and the upper limit of the generation number preserved on the outer storage device is divided into the preservative and reserve generation numbers, and the oldest generation data set in the generation adding the preservative and reserve generation numbers is eliminated every time when the latest generation data set is prepared after the data set of the generation adding the preservative and reserve generation numbers is prepared. Even when the generation data set of reserve generations is illegally prepared by preserving the data set of generations adding the preservative and reserve generation numbers, the normal data set with preservative generations can be secured.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to data set generation management in a computer system, and more particularly to a method for storing data sets of multiple generations.

0002

[Prior Art] When backing up a data set on a magnetic disk as a backup data set to a magnetic tape and managing the generation of this backup data set, the conventional method was to As described on page 8 of the "Set Backup DMF/BKUP User's Guide" manual (1990), when the original data set is evacuated and the latest generation backup data set is created, the oldest generation data set is deleted. The number of backup datasets equal to the maximum number of generations to be saved is always saved. However, after creating the latest generation backup data set, that is, after the oldest generation data set has been deleted, if you notice that the original data set was fraudulent, for example,
The latest generation backup data set is not correct, and the number of generations of normal backup data sets is
The number of generations to be saved will be less than the maximum number of generations. In other words, among the maximum number of generation backup data sets that can be saved, unhealthy backup data sets will be included, and the maximum number of generations to be saved will no longer be the number of generations that guarantees the preservation of normal generation data sets. . For this reason,
If the recovery of the original data set is carried out on the premise that a normal data set for the maximum number of saved generations is guaranteed, this assumption will break down.

0003

Problems to be Solved by the Invention Due to the increase in the amount of data accompanying the increase in the scale of computer systems, the amount of data recorded in datasets has been increasing more and more. Therefore, when an abnormality occurs in a data set, the impact is extremely large, and management of backup data sets for recovery has become extremely important. In addition, if the operating system can recognize whether the results of jobs executed on a computer system, including backup work, are correct or not, for example, the job may end abnormally due to lack of resources, but the operating system recognizes that the job has ended normally. Even if the job results are checked later with human eyes,
Even if it is recognized that it was fraudulent, there is a possibility.

[0004] In the conventional technology, once the operating system recognizes that a job has completed successfully, the oldest generation data set is automatically deleted, and abnormalities that cannot be recognized by the operating system cannot be detected later by the human eye. When this happens, the result is that a normal data set for the maximum number of saved generations is not guaranteed.

[0005] A first object of the present invention is to provide generation-managed data sets such as backup data sets.
Even if an abnormality that cannot be recognized by the operating system in the job that creates the data set is detected by the human eye after the job is executed, a backup generation will be set and the number of saved generations will be equal to the number of normal generations. The goal is to guarantee a state data set.

A second object of the present invention is to be able to monitor the number of saved generations of normal generation data sets stored on an external storage device based on the number of saved generations.

[0007]

[Means for solving the problem] The above purpose is to have an arbitrary number of reserve generations in addition to the number of saved generations, and when creating the latest generation dataset, the number of generations resulting from adding the number of saved generations and the number of reserve generations. This is achieved by deleting the oldest generation data set.

Furthermore, the above object is achieved by having means for comparing the number of generations to be deleted and the number of backup generations in the process of deleting invalid generation data sets from generation management.

[0009]

[Operation] By saving data sets for the number of generations including the number of preservation generations and the number of reserve generations, even if a generation data set for the number of reserve generations is created illegally, a normal data set for the number of preservation generations will be created. will be guaranteed.

Furthermore, by comparing the number of generations to be deleted and the number of backup generations, it was found that if the number of generations to be deleted exceeds the number of backup generations, the preservation of the data set for the number of generations to be saved cannot be guaranteed. It becomes possible to issue a warning to that effect.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows the hardware equipment configuration and system configuration for realizing the present invention. The central processing unit 101 includes an instruction execution processor 102 and a main memory 103 that can be referenced and updated by the instruction execution processor 102.
It consists of 104 is an operating system that controls the system, and within the operating system 104 is a generation management program 105 that implements the present invention. Reference numeral 106 denotes a generation data set management list which constitutes a component of the present invention, in which the generation data set shown by 109 is saved and stored on an external storage device such as a magnetic disk device shown by 107 or a magnetic tape device shown by 108. Manage the group.

FIG. 2 shows the structure of the generation data set management list 106 and the format of a generation management record 201 that manages one generation data set group recorded in the generation data set management list. The generation management record 201 includes a generation group name storage field 202 that stores a generation group name that is the name of the generation dataset group, and a generation dataset name storage field 203 for each generation dataset stored on an external storage device. Consists of. The number of generation data set name storage fields 203 is equal to the number of saved generations plus the number of backup generations, and the leftmost generation data set name storage field is for the latest generation, and the fields on the right are for older generations. The format is as follows.

FIG. 3 shows a method for specifying the number of preservation generations and the number of reserve generations for a generation data set group having a generation group name. GDG 301 is a keyword for registering a generation data set, 302 is a generation group name designation, 303 is a designation of the number of preservation generations, and 304 is a designation of the number of backup generations.

FIG. 4 is a flowchart showing the processing procedure of the generation management program 105 of FIG. 1 when creating a new generation data set. First, locate the generation management record 201 with the target generation group name (step 4).
01). Then, as shown in 4021, in the generation management record 201, the generation dataset name storage field 203 corresponding to the oldest generation at the far right is deleted, and each The generation data set name storage field is shifted to the right by one field, and the new generation data set name is stored in the leftmost generation data set name storage field. This is called generation round processing (step 402).

FIG. 5 shows a method for specifying a command to delete a generation data set registered in the generation management record 201. 501 in the figure is the designation of the generation group name to be deleted, 502 is the number of generations to be deleted,
Generation data sets corresponding to the number of generations starting from the latest generation are deleted, and are also deleted from the external storage device.

FIG. 6 is a flowchart showing the generation deletion processing procedure of the generation management program 105 according to the specifications shown in FIG. First, the generation management record 201 having the target generation group name is located (step 601). Next, compare the number of generations to be deleted and the number of spare generations for the generation group (
Step 602). If the number of generations to be deleted is greater than the number of backup generations (>), the computer user is notified with a warning message (step 603), and if the computer user instructs to continue the process, the process goes to 604, and if the process is canceled, the process ends. Go to 606. If the number of deleted generations is equal to or smaller than the number of spare generations (≦) in 602, the process also goes to deletion processing in 604. And 6
As shown in 041, delete the specified number of deletion generations from the generation dataset name storage field for the latest generation dataset, including the generation dataset name storage field, and store the name of each generation dataset for this number of generations. Shift the field to the left (step 604). This process is called a reset process. Furthermore, from the external storage device,
Delete the deleted generation data set (step 605
) Terminate processing.

[0018]

[Effects of the Invention] According to the present invention, in data set generation management, when a new data set is created, the operating system recognizes that the job has ended normally, and the oldest generation data set is deleted. Even if the number of generations occurs, normal data sets corresponding to the number of preservation generations can be saved on the external storage device.

Furthermore, according to the present invention, it is possible to monitor the number of generations of normal generation datasets stored on the external storage device based on the number of stored generations.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the hardware equipment configuration and system configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing the structure of a generation data set management list.

FIG. 3 is a diagram showing a method of specifying the number of preservation generations and the number of reserve generations.

FIG. 4 is a flowchart showing the processing procedure of a generation management program when creating a new generation data set.

FIG. 5 is a diagram illustrating a method of specifying a command to delete a generation data set registered in a generation management record.

FIG. 6 is a flowchart showing a generation deletion processing procedure of a generation management program.

[Explanation of symbols]

105...Generation management program, 106...Generation dataset management list, 107...Magnetic disk device, 108...Magnetic tape device, 109... Generation dataset group, 201...Generation management record, 202... Generation group name storage field, 203...Generation dataset name storage field.

Claims (2)

[Claims] 1. A computer system having an external storage device such as a disk device or a magnetic tape device, the data processing having a generation management method that allows data sets for a certain number of generations to be stored on the external storage device. In the system, the generation management method is equipped with a generation management control means that controls the upper limit of the number of generations of datasets to be saved on the external storage device by dividing it into the number of preservation generations and the number of reserve generations, and Each time a dataset of the latest generation is created after the data set is created for the number of generations including the number of preservation generations and the number of reserve generations, the number of preservation generations and the number of reserve generations are created. By automatically deleting the data set of the oldest generation among the generations including the number of saved generations and the number of backup generations, the data set from the latest generation is stored on the external storage device. Even if incorrect generation datasets are created for the number of backup generations, the existence of datasets for the number of backup generations guarantees that data sets in the correct state for the number of storage generations will be saved. A data set generation management method characterized by: 2. In the data set generation management method comprising the generation management control means according to claim 1, in the means for deleting the invalid generation data set from generation management, the number of generations to be deleted and the number of reserve generations are compared. means for issuing a warning when the number of generations to be deleted exceeds the number of backup generations and the number of generation data sets stored on the external storage device cannot guarantee the number of generations to be saved; 1. A dataset generation management method, characterized in that it is possible to constantly monitor how many generations of datasets are stored based on the number of storage generations.