JP2732948B2 - Magnetic tape volume mounting method and computer system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates relates to a computer system having a mounting how and functions of the magnetic tape volume,
In particular, a plurality of magnetic tape devices, a magnetic tape volume attaching / detaching mechanism for attaching / detaching a cartridge type magnetic tape volume (cartridge MT) to / from the magnetic tape device, a cartridge MT transport mechanism for automatically transporting the cartridge MT, and a large number of cartridges MT are provided. The present invention relates to a method and system suitable for mounting a magnetic tape volume to be used in a job to a magnetic tape device before starting a job in a computer system provided with an MT library device including a cartridge MT storage shelf in which a cartridge is stored.

[0002]

2. Description of the Related Art In a computer system equipped with an MT library device, it is necessary to reduce a waiting time such as a magnetic tape volume attaching / detaching time as much as possible in order to execute a job efficiently.

The prior art is disclosed in, for example,
As described in Japanese Patent Application Laid-Open No. 0329, when a magnetic tape volume used in a running job is used also in the next job, when the job of the running job ends, the magnetic tape used by the finished job is used. There is known a method of controlling the tape volume so as not to be removed, thereby reducing the load of magnetic tape volume replacement and shortening the time required for attaching and detaching the magnetic tape volume. Further, in an automatic magnetic tape library system having a cartridge magnetic tape device, a cartridge selecting / conveying device, and a control device for controlling these two devices, as described in, for example, JP-A-1-319163, By moving the cartridge selection and transport device to the position of the cartridge magnetic tape device during rewinding for removal of the cartridge or during removal of the cartridge magnetic tape volume, and mounting the cartridge magnetic tape volume after the removal is completed, It is also known to reduce the time for mounting or removing the volume.

[0004]

Problems to be Solved by the Invention Japanese Patent Application Laid-Open No. 60-1032
According to the method disclosed in Japanese Patent Application Laid-Open No. 9-209, when a magnetic tape volume used in a job being executed in the same magnetic tape device is different from a magnetic tape volume used in a job started next, a magnetic tape volume is used. This causes a problem that the job to be started next is waited until the detachment operation is completed.
Further, in the method disclosed in Japanese Patent Application Laid-Open No. 1-319163, the moving time of the cartridge selecting / conveying device is reduced, but the magnetic tape volume to be used in the next job is continuously mounted on the cartridge magnetic tape device. There is a problem that the execution of a job that is started is waited for.

An object of the present invention is to control a magnetic tape attaching / detaching mechanism for attaching or detaching a magnetic tape volume to or from a magnetic tape device in a computer system having an MT library device so that a magnetic tape volume can be added after a currently executing job. By mounting a magnetic tape volume to be used for an unexecuted job to be executed on a desired magnetic tape device in advance, the waiting time for mounting the magnetic tape volume at the start of execution of the job is eliminated.

[0006]

In order to achieve the above object, the present invention provides a computer system having a magnetic tape library device, comprising: a job schedule information file for storing job execution order information; J that stores job control statements (JCL) that are information to be controlled
A CL file and a job medium master file for storing information on a recording medium used in the job. The job schedule information file confirms an unexecuted job, and reads the job's JCL from the JCL file. Obtain the file name of the data set to be processed, its generation number, and the magnetic tape device to be used, read the record having the file name and the generation number from the job medium master file to obtain the volume serial number, and correspond to the volume serial number. The main feature is that the magnetic tape volume to be mounted is mounted on the magnetic tape device obtained from the JCL.

[0007]

The computer system has an operating system (OS) for controlling the MT library device and a monitor program for executing a job based on the job schedule information in the job schedule information file.
For example, if the operator inputs a magnetic tape volume pre-mounting command specifying a job name to be executed after the currently executing job while monitoring the display of the console device, the monitor program will execute The job schedule information file is used to check whether the job is an unexecuted job to be executed later. If it is determined that the job is an unexecuted job, the JCL of the specified job is read from the JCL file, and Obtain a magnetic tape device to be used,
The record having the generation number of the file specified in L is read from the job medium master file, and the volume serial number of the magnetic tape volume used in the specified job is obtained. By instructing the operating system to mount the magnetic tape volume using the obtained volume serial number and the magnetic tape device as mounting instruction information in this way, the operating system can use the tape before starting execution of the job under the control of the operating system. The mounting of the magnetic tape volume to the magnetic tape device can be completed.

[0008]

FIG. 1 is a block diagram of a computer system according to an embodiment of the present invention, which comprises a central processing unit 1, an input / output unit 2, a direct access storage unit 3, a magnetic tape control unit 4, and an MT library unit 5. .

The direct access storage device 3 stores a job schedule information file (job monitor file) 31 for storing job execution order information (schedule information) and a JCL (job control statement) for controlling job execution. It has a JCL file 32 and a job medium master file 33 for storing information of a recording medium used in a job.

The MT library device 5 automatically transports a plurality of magnetic tape devices 51, a magnetic tape attaching / detaching mechanism 52 for attaching and detaching a magnetic tape volume (cartridge MT) to and from any of the magnetic tape devices 51, and a cartridge MT. It comprises a cartridge MT transport mechanism 53 and a cartridge MT storage shelf 54 that stores a large number of cartridges MT. Since this type of MT library device itself is well known, the detailed configuration is omitted.

The central processing unit 1 includes a main storage device 10,
A monitor program 11 and an operating system (OS) 12 are placed on the main storage device 10 as programs related to the present invention. The monitor program 11 is a program for executing a job. In this embodiment, when an operator gives an instruction for a job for mounting a magnetic tape volume in advance by using the input / output device 2, the monitor program 11 uses the job schedule information file 31 based on the job schedule information. It is determined whether or not the specified job is an unexecuted job. And
When it is confirmed that the job is an unexecuted job, the JCL of the designated job is read from the JCL file 32 and
Obtain a magnetic tape device to be used in the job, and
Then, the job medium master file 33 is searched by using the file name and the generation number of the processing target data set specified in (1) to obtain a volume serial number, and a mounting instruction is issued to the OS 12 using the magnetic tape device and the volume serial number as mounting instruction information. The OS 12 controls the MT library device 5 via the magnetic tape control device 4 based on the information instruction received from the monitor program, and transfers the magnetic tape volume of the specified volume serial number to the specified magnetic tape. Mounting.

FIGS. 5 and 6 show a processing flow of the monitor program 11, which will be described in detail later.

FIG. 2 shows a job schedule information file 3
FIG. 3 is a diagram showing the content of No. 1. The job schedule information file 31 includes a schedule class record 311 and a plurality of job records 312 having a chain structure for each class.
Consists of The schedule class record 311 is the first record position information 31 that can know the position of the first record of the group of job records 312 for each job execution class.
It has 1 as a field. Each job record 312 corresponds to one job, and includes a job name 313 of the job, a job name (preceding job name) 314 of one or more jobs to be executed immediately before the execution of the job,
A job status flag 315 indicating the status of the job (normal termination, abnormal termination, unexecuted, running, etc.) and the position of the job record corresponding to the job executed next to the job can be known. A row job chain 316 is provided as a field. When a job is newly added, after the last record 312 of the chain of the job record group of the job execution class of the added job,
A job record corresponding to the added job is chained.

FIG. 3 shows the contents of the JCL file 32. JCL file 32 is directory record 3
20 and JCL information 323. The directory record 320 has, as fields, a job name 321 of each job and JCL position information 322 from which the position of the JCL information of the job name 321 can be known. JCL information 3
Reference numeral 23 denotes a control statement of each job. For example, regarding the JCL information of job name 1, PGM =
"Xxx" means that the name of the program to be executed (EXEC) is "xx
× ”. Also, DSN = A (+
1) The data set (DSN) to be processed is
The file name is “A” and the generation number is “1”, and UNIT = MTL indicates the device type (U
(NIT) indicates an MT library device (MTL).

FIG. 4 is a diagram showing the contents of the job medium master file 33. The job medium master file 33 includes a file information record 330 and a plurality of generation information records 3
It consists of 35. The file information record 330 includes a file name 331 indicating the file name of the file, a latest generation number 332 indicating the latest generation number of the file indicated by the file name 331, and the position of the first record of the group of generation information records 335. A generation information record chain 333 and a device type 334 indicating an MTT library device or the like are provided as fields. Each generation information record 335 includes a generation information record chain 336 capable of knowing the position of a generation information record of a generation one generation older than the generation information record 335, a generation number 337 indicating a generation, and a generation number indicated by the generation number 337. And one or more volume serial numbers 338 having the following fields as fields.

An example of the processing procedure of the monitor program 11 according to the present invention will be described below with reference to the flowcharts of FIGS.

First, the operator receives a "job execution class of a job to which a magnetic tape volume is pre-mounted" and a "job name" input from the input / output device 2 (step 101). Next, this received "job execution class"
Then, a format check of the format of the job and the "job name" is performed (step 102). If the format is correct, a “job record” having the specified “job name” in the specified “job execution class” is searched from the schedule information file 31 (FIG. 2) (step 103). Then, it is checked whether there is a “job record” of the specified “job name” in the specified “job execution class” (step 104). As a result of the check, if there is no corresponding “job record”, the flow branches to step 113.

If a corresponding "job record" exists in the schedule information file 31, it is determined whether or not the job of the designated job name has not been executed by using the status flag (315 in FIG. 2) of the job record. Check (step 105). As a result of the check, if not executed (executed, executing, etc.), the process branches to step 113. If the job with the specified job name has not been executed (that is, if it is confirmed that the job with the specified job name is to be executed at least after the currently executing job),
The JCL corresponding to the designated “job name” is read from the JCL file 32 (FIG. 3) (step 106),
From the read JCL, “Magnetic tape device type (UN
"IT operand information)", "file name (DSN operand information)", and "generation number" (step 10).
7). Then, the OS 12 is instructed to notify the mounting status of the magnetic tape volume of the magnetic tape device of the same type as the magnetic tape device type obtained from the JCL.
A list of the magnetic tape volume mounting status is received from S12 (step 108). In this case, the MT library device 5 is designated as the device type, and the OS 12 notifies the mounting status list of the group of magnetic tape devices 51 of the MT library device 5. Based on the magnetic tape volume mounting status list from the OS 12, it is checked whether there is a magnetic tape device of the same type as the "magnetic tape device type" specified by the JCL, and to which no magnetic tape volume is mounted (step 109). ).
As a result of the check, if the magnetic tape volume is mounted on all the magnetic tape devices of the same type, the process branches to step 113.

As a result of the check, if there is a magnetic tape device of the same type in which no magnetic tape volume is mounted (here, if there is a magnetic tape device 51 in which no magnetic tape volume is mounted in the MT library device 5). , The record having the “generation number” of the file specified by the JCL is stored in the job medium master file 33.
It is read from (FIG. 4) (step 110). Next, the "volume serial number" of the volume corresponding to the "generation number" is obtained from the read record (step 11).
1). Then, the “volume serial number” and the “magnetic tape device type” in the JCL are used as mounting instruction information.
A command to mount the magnetic tape volume is issued to the OS 12 (step 112).

Thus, the processing of the monitor program 11 is completed. The OS 12 transmits the “volume serial number” and the “magnetic tape device type” (MT library device 5) for which the mounting instruction is given from the monitor program 11, to the magnetic data controller 4.
Pass to. The magnetic tape control device 4 is an MT library device 5
The cartridge MT transport mechanism 53 and the magnetic tape attaching / detaching mechanism 52 are controlled to take out the cartridge MT of the specified volume serial number from the cartridge MT storage shelf 54 and mount it on the unmounted magnetic tape unit in the magnetic tape unit 51 group.

The embodiment of the present invention has been described above. In the present embodiment, the operator instructs a job to mount the magnetic tape volume in advance. For example, the monitor program 11 searches the job schedule information file 31 at predetermined time intervals and automatically sets the next magnetic tape volume. A job that needs to be mounted in advance may be determined.

In the embodiment, if there is no magnetic tape device of the same type as the "magnetic tape device type" designated by the JCL and no magnetic tape volume is mounted, an error message is output uniquely. However, when a magnetic tape volume used in a job executed after the instructed job is mounted on the magnetic tape device, the volume serial number of the mounted magnetic tape volume and the volume It is also possible to instruct the OS to remove the magnetic tape device as the detach information from the OS, and further instruct the magnetic tape volume to be used in the job for which the instruction has been issued.

Further, when the number of magnetic tape volumes to be mounted is larger than the number of unmounted magnetic tape devices for the specified job, the number of magnetic tape volumes equal to the number of unmounted magnetic tape devices is changed to the number of the magnetic tape volumes. You may make it attach to an apparatus.

[0024]

As is apparent from the above description, according to the present invention, by specifying the job name and the execution class of the job by the operator or the like, the mounting of the magnetic tape volume used in the specified job can be performed. This becomes possible before the execution of the job starts, and the waiting time due to the completion of mounting the magnetic tape volume at the time of executing the job is eliminated.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an electronic computer system according to an embodiment of the present invention.

FIG. 2 shows record contents of a job schedule information file.

FIG. 3 shows the record contents of a JCL file.

FIG. 4 shows the record contents of a job medium master file.

FIG. 5 is a flowchart of a process related to the present invention of the monitor program.

FIG. 6 is a continuation of the flowchart in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Central processing unit 11 Monitor program 12 Operating system 31 Job schedule information file 32 JCL file 33 Job medium master file 5 MT library device 51 Magnetic tape device 52 Magnetic tape fitting mechanism 53 Cartridge MT transport mechanism 54 Cartridge MT storage shelf

Claims (3)

(57) [Claims] 1. A method for mounting a magnetic tape volume in a computer system having a magnetic tape library device.
Steps there are, check the job unexecuted by the job scheduling information file for storing execution order information of the job
And a job control statement (JC
From the JCL file storing L), sucrose of the unexecuted
The JCL of the data set is read, and the file name of the data set to be processed, its generation number, and the magnetic tape device to be used are read.
Obtaining a job medium for storing information of a recording medium used in a job
Mounting the master file, and obtaining a volume serial number reading records with the file name and generation number of the data set of the processing target, the magnetic tape volume corresponding to the volume serial number, the obtained magnetic tape apparatus Step to do
And mounting of a magnetic tape volume characterized by having
How . 2. The magnetic tape volume mounting method according to claim 1, wherein the confirmation of the unexecuted job based on the job schedule information file is performed for a job for which a magnetic tape volume mounting instruction has been issued by an operator. 3. A computer equipped with a magnetic tape library device.
In machine systems, job scheduling information for storing execution order information of the job
Information file and the job information that controls job execution.
JCL file that stores the control statements (JCL)
Media area that stores information on the recording media used in the job
And a magnetic tape volume specified by the operator by specifying a job name.
An input device for inputting pre-mounting command, a mounting instruction in the magnetic tape volume by the command
The job schedule information file
Confirm that the job has not been executed by the
Read the JCL of the job from the JCL file and process
File name of Detase Tsu capital of the subject and its generation number and use
Obtain the magnetic tape device to be used, the file name and
From the job media master file
A central processing unit that obtains a volume serial number by reading, and a volume serial number and a magnetic tape from the central processing unit.
Device information passed to control magnetic tape library device
And a magnetic tape volume corresponding to the volume serial number.
Magnetic tape for mounting a volume on the magnetic tape device
A computer system comprising: a control device .