JP5213488B2 - Backup system and generation data management method - Google Patents

Description

  The present invention relates to a backup system that backs up data of a computer system to a recording medium for each generation, and a generation data management method for managing a generation that is a recording unit with the passage of time in the backup system. The present invention relates to a backup system and a generation data management method that can be reduced.

  In recent computer systems, a backup system for backing up data from a computer system to a remote backup system has been constructed in order to prevent a large amount of data from being lost in the event of a disaster or the like. A magnetic tape cartridge (hereinafter referred to as a magnetic tape) having a low unit price and being portable is employed.

  This backup system using magnetic tape can back up generation data for each week of the month (every predetermined time), for example, savings and backup backup jobs for financial institutions, etc. Is configured so that data can be recovered up to the generation that performed the backup.

In addition, as a document describing generation management technology in the magnetic tape backup system described above, the following patent document can be cited, and in this patent document, in order to prevent human error and reliably perform backup for each generation, A technique is described in which a backup job ID, a backup date and time, etc. are recorded as backup information in the header of a magnetic tape, and backup is performed while monitoring the backup information when performing backup according to a predetermined schedule.
JP 2000-322298 A

  The technology described in the above-mentioned patent document can perform generation management using a magnetic tape as a recording medium. When a failure occurs in a magnetic tape, the backup of the same job is performed even though backup management is performed for each generation. There was a problem that all data could be lost.

  Specifically describing the problems with this conventional technique, for example, as shown in FIG. 11, weekly generation backup data a1 to a4 of the system A are recorded on a physical medium (recording medium) 1 which is a magnetic tape, and the magnetic tape is recorded. For example, when a failure occurs in the physical medium 1 in the case where a failure occurs in the physical medium 1, data backup of a plurality of generations is performed on the same recording medium. There was a problem that multiple generations of backup data of the A system might be lost. Conventionally, in order to avoid this problem, it has been necessary to design the operation so that the user does not record multiple generations of data on the same physical medium, and there is a problem that management becomes complicated. Also, in the conventional system, unlike the virtual tape library, the user cannot control which physical media the virtual tape is placed on, so that the above-mentioned multiple generations of data are not recorded on the same physical media. It was difficult to design.

  An object of the present invention is to provide a backup system and a generation data management method capable of preventing the loss of all generation data even when a failure occurs in a recording medium such as a magnetic tape.

To achieve the above object, the present invention provides a data recording / reproducing unit for recording / reproducing data on / from a plurality of recording media grouped by group numbers, and a recording / reproducing unit for recording / reproducing data by the data recording / reproducing unit. A recording medium switching unit that selectively switches media; a data storage request unit that requests the recording medium switching unit to record generation data for each predetermined time of the same job; and a control unit that controls the medium switching unit A backup system that backs up received job and generation data at a predetermined time interval,
The control unit is
A recording medium group switching management table storage unit storing a job identifier for identifying the job, a recording medium group number set in the job identifier, and recording medium switching date and time information for specifying a date and time for switching the recording medium by generation;
Number circulation means for cyclically changing the medium group number between a minimum recording medium group number and a maximum recording medium group number;
A receiving step of receiving a generation data backup command specifying a job from the data storage request unit;
An identifier determination step for determining whether or not a recording medium group number is set in a job identifier corresponding to a backup command job received by the reception step, based on the presence or absence of a job identifier stored in the medium group switching management table storage unit When,
When it is determined in the identifier determination step that a recording medium group number is set, a switching date and time for determining whether or not the switching date and time specified by the recording medium switching date and time information in the medium group switching management table storage unit has been reached A determination process;
A group switching step of changing the recording medium group number by one from the minimum recording medium group number to the maximum recording medium group number by the number circulation means when it is determined in the switching date determination step that the switching date has been reached When,
It is a first feature that a recording step of recording generation-specific data on a recording medium with a recording medium group number changed by the group switching step using a data recording / reproducing unit is performed .

Further, the present invention provides the backup system according to the first feature,
Storing the medium group number, a recording medium number defined in the recording medium group number, and status information of either an idle state or an active state of the recording medium defined in the medium group number; A recording medium group management table storage unit that selectively sets an active state or an idle state corresponding to a recording medium of a number;
The control unit is
When it is determined in the identifier determining step that the recording medium group number is set, the status of the recording medium with the set recording medium group number is referred to the status information stored in the medium group management table storage unit. A state determination step for determining
Changing the recording medium of the recording medium group number determined to be in the idle state in the state determination step to the active state, and executing the state changing step of storing the changed state information in the recording medium group management table storage unit. Two features.

Further, according to the present invention, in the backup system of any one of the above characteristics, when the control unit determines that a recording medium group number is not set in the identifier determination step, the backup command received by the reception step is new A third feature is that a registration step of registering the job identifier in the recording medium group in the recording medium group switching management table storage unit is executed.

According to the present invention, in the backup system of the third feature, when the control unit performs the registration process, the number of jobs assigned to each recording medium group is recorded in the recording medium group switching management table storage unit. A fourth feature is that a new job identifier is additionally registered in the recording medium group that counts for each group and has the smallest number.

According to the present invention, in the backup system of any one of the above characteristics, when the control unit records generation data by using the data recording / reproducing unit in the step, the capacity of the generation data to be recorded is a recording medium. It is determined whether or not the remaining recording capacity is exceeded, and when it is determined that the recording capacity is exceeded, a plurality of recording steps of dividing and recording generation data on a plurality of recording media in the same recording medium group are executed. And

Further, according to the present invention, in the backup system according to any one of the above characteristics, whether the number of jobs received by the control unit in the step exceeds the number of recording medium groups stored in the medium group switching management table storage unit. A sixth feature is to execute a standby step of waiting for the number of jobs exceeding the number of recording medium groups when it is determined whether or not the number is exceeded.

Furthermore , the present invention selectively selects a data recording / reproducing unit for recording / reproducing data on / from a plurality of recording media grouped by group numbers, and a recording medium for recording / reproducing data by the data recording / reproducing unit. A recording medium switching unit for switching, a data storage requesting unit for requesting the recording medium switching unit to record generation data for each predetermined time of the same job, and a control unit for controlling the medium switching unit. A generation data management method for a computer system for backing up job-specific and generation-specific data at a predetermined time interval,
In the control unit,
A recording medium group switching management table storage unit storing a job identifier for identifying the job, a recording medium group number set in the job identifier, and recording medium switching date and time information for specifying a date and time for switching the recording medium by generation;
A number circulation means for cyclically changing the medium group number between a minimum recording medium group number and a maximum recording medium group number;
A receiving step of receiving a generation data backup command specifying a job from the data storage request unit;
An identifier determination step for determining whether or not a recording medium group number is set in a job identifier corresponding to a backup command job received by the reception step, based on the presence or absence of a job identifier stored in the medium group switching management table storage unit When,
When it is determined in the identifier determination step that a recording medium group number is set, a switching date and time for determining whether or not the switching date and time specified by the recording medium switching date and time information in the medium group switching management table storage unit has been reached A determination process;
A group switching step of changing the recording medium group number by one from the minimum recording medium group number to the maximum recording medium group number by the number circulation means when it is determined in the switching date determination step that the switching date has been reached When,
According to a seventh aspect of the present invention, a recording step of recording generation-specific data using a data recording / reproducing unit on the recording medium of the recording medium group number changed by the group switching step is performed.

According to the present invention, in the generation data management method of the seventh feature, the medium group number, the recording medium number defined in the recording medium group number, and the idle of the recording medium defined in the medium group number A recording medium group management table storage unit that stores state information of either a state or an active state, and selectively sets an active state or an idle state corresponding to the recording medium of the medium group number,
In the control unit ,
When it is determined in the identifier determining step that the recording medium group number is set, the status of the recording medium with the set recording medium group number is referred to the status information stored in the medium group management table storage unit. A state determination step for determining
The recording medium group number determined to be in the idle state in the state determination step is changed to the active state, and the state change step of storing the changed state information in the recording medium group management table storage unit is executed. Eight features.

In the generation data management method of any of the above characteristics, the present invention provides a backup command received by the receiving step when the control unit determines that a recording medium group number is not set in the identifier determining step. A ninth feature is that a registration step of additionally registering the new job identifier in the recording medium group of the recording medium group switching management table storage unit is executed.

According to the present invention, in the generation data management method according to any one of the above characteristics, when the control unit performs the registration step, the number of recording media registered in each recording medium group is stored in the recording medium group management table storage unit. A tenth feature is that a new job identifier is additionally registered in a recording medium group that is calculated based on the number of recording medium numbers and has the smallest number.

According to the present invention, in the generation data management method of any one of the above characteristics, when the control unit records generation data by using the data recording / reproducing unit in the step, the capacity of generation data to be recorded is recorded. Determining whether or not the recording capacity exceeds the remaining recording capacity of the recording medium, and determining that the recording capacity is exceeded, executing a plurality of recording steps for dividing and recording generation data on a plurality of recording media in the same recording medium group. Eleven features.

Further, the present invention provides the generation data management method according to any one of the above features, wherein the number of jobs received by the control unit in the step is the number of recording medium groups stored in the medium group switching management table storage unit. A twelfth feature is that a standby process is performed to wait for the number of jobs exceeding the number of recording medium groups when it is determined whether or not the number exceeds the number of recording medium groups.

  A backup system and a generation data management method according to the present invention include a recording medium group switching management table storage unit that stores a recording medium group number set for each job identifier and recording medium switching date and time information for specifying a date and time for switching the recording medium for each generation. And a number circulation means for cyclically changing the recording medium group number from the smallest to the largest number, and the control section uses the number circulation means to store the recording medium group number stored in the recording medium group switching management table storage section. By cyclically changing the data using, it is possible to switch the physical media at each backup acquisition cycle and back up generational data. Therefore, it is possible to prevent generation data from being lost even when a failure occurs in a recording medium such as a magnetic tape.

  Hereinafter, an embodiment of a backup system to which a generation data management method according to the present invention is applied will be described in detail with reference to the drawings. 1 is a conceptual diagram of a basic configuration of a backup system to which the present invention is applied, FIG. 2 is a diagram for explaining a generation data management method according to the first principle of the present embodiment, and FIG. 3 is a second principle of the present embodiment. FIG. 4 is a diagram for explaining a generation data management method according to the third principle of this embodiment, and FIG. 5 is a flow chart of physical media group switching processing according to this embodiment. FIG. 6, FIG. 6 is a diagram showing a physical media allocation processing flow according to this embodiment, FIG. 7 is a diagram showing a physical media allocation processing flow according to this embodiment, and FIG. 8 is a backup job start processing flowchart according to this embodiment. 9 is a backup job end processing flowchart, FIG. 10 is a diagram showing a physical media group switching management table according to the present embodiment, and FIG. 11 is a physical media group according to the present embodiment. Is a diagram showing an A group management table.

[Constitution]
The backup system according to the present embodiment backs up data stored in a magnetic disk device of a host computer to a magnetic tape storage device which is an external storage device. As shown in FIG. Data recording request unit 100 that performs backup control according to data transmission / reception and a preset procedure, and a physical medium (recording medium) for recording data of the host computer in accordance with an instruction from the data recording request unit 100 to select data A physical media switching unit 400 that performs recording, and a control unit 500 that performs backup control of the data of the host computer to the physical media switched by the physical media switching unit 400 in accordance with an instruction from the data recording requesting unit 100.

  The physical medium according to the present embodiment is, for example, a magnetic tape cartridge that stores a wound magnetic tape, but is not limited to this, and is a hard disk drive, a tape medium, or a hard disk drive in a RAID group with a parity group. When the recording medium is a magnetic tape, the physical media switching unit 400 may be a transport mechanism that transports the physical medium designated by the data recording request unit 100 from the storage, or data recording to the magnetic tape. A data recording / reproducing unit that performs reproduction is also included.

  The control unit 500 according to the present embodiment includes a management table (storage unit) illustrated in FIGS. 9 and 10 and a job wait list information table (storage unit) that stores job wait list information (not illustrated). When data of job systems A and B (for example, savings and lending jobs at financial institutions) is backed up by generation every week and two physical media groups 1 and 2 are used as recording media, FIG. The management table (storage unit) shown in FIG. 2 stores a job identifier indicating the type of the job, a group number designating a backup physical media group of a physical medium predetermined for each job identifier, and a predetermined number for each job identifier. Consists of each piece of information stored in each column of the specified physical media switching date and time. The management table (storage unit) shown in 0 indicates that the physical media group, the usage status (Idle / Active / invalid) corresponding to the physical media group, and the physical media allocated to the physical media group Each piece of information is stored in each column of the belonging physical media number indicating the number. Each table (storage unit) described above is formed on a storage unit such as a memory.

  The group number of the physical media is a grouping of a plurality of data corresponding to a specific system (job) and generation to be recorded on the same physical media. For example, the physical media 1 includes the first week of the A system. When the generation data, the second week generation data of the B system, the third week generation data of the A system, and the fourth week generation data of the B system are recorded, these generation data are grouped as a physical media group 1. is there.

  Therefore, the physical media group switching management table shown in FIG. 9 sets that the physical media group to be backed up is “1” for the job with the job identifier “A system”, as shown in FIG. In the physical media group management table, for example, the usage status of the physical media group “1” is in an idle state, and the physical media (affiliated physical media) numbers assigned to the physical media group “1” are “1” “6”. “7” is set in advance.

[Basic principle]
The inventors of the present application pay attention to the fact that normal backup data is backed up regularly, such as weekly, and by switching the physical media for each backup cycle and recording the backup data on different physical media, The present invention has been made to avoid the simultaneous loss of all backup data due to a media failure and to automate the backup operation.

  In addition, in order to cope with the case where storage efficiency of the physical media is required, the inventors can efficiently share the physical media by allocating multiple job data by sharing the physical media (addition in case of tape). Storage is also realized.

  Further, in order to cope with a case where performance is required, switching of physical media is managed in units of jobs, and parallel processing of a plurality of jobs is realized using physical media corresponding to a predetermined number of parallel processing.

Next, exemplary embodiments of the generation data management method based on the basic principle will be described with reference to the examples shown in FIGS.
[First example]
First, in the example shown in FIG. 2, there are two physical media 1 and 2 as recording media, and a physical media group for recording the first week data a1 and the third week data a3 of the A system on the physical medium 1. 1 shows an example in which the physical media 2 for recording the second week data a2 and the fourth week data a4 of the A system is set on the physical medium 2, and the relationship between these physical media and the physical media group is illustrated. 9 and the management table shown in FIG. In the example described later, the relationship between the physical media and the physical media group is assumed to be stored.

  In this way, the generation data management method according to this example performs automatic generation data separation by switching physical media at every backup acquisition cycle. For example, in the backup of the A system in the first week, the generation data management method After switching and assigning the physical medium 1, the backup data is recorded. Next, in the backup of the A system in the second week, since one week has passed, after switching to the physical media group 2 and assigning the physical media 2, the backup data is recorded. In the backup of the A system in the third week, since the number of physical media groups is 2, the system is switched to the physical media group 1 and the backup data is recorded in the free capacity portion of the physical media 1. By performing the subsequent processing in the same manner, the present system can avoid losing all backup data at the same time due to a physical media failure and can automate the operation.

[Second example]
The example shown in FIG. 3 is for explaining an example of improving the data storage efficiency by sharing the physical media. There are six recording media 1 to 6 as the recording media. The first week data a1 and a part of the second week data b2 of the B system are recorded, and the remaining data of the second week data b2 of the B system, the third week data a3 of the A system, and the B system of the B system are recorded on the physical medium 4. A part of the fourth week data b4 is recorded, the physical medium group 1 for recording the remaining data of the B system data b4 is set on the physical medium 6, and the first week data of the B system is further set on the physical medium 2. b1 and a part of the second week data a2 of the A system are recorded, and the remaining data of the second week data a2 of the A system, the third week data b3 of the B system, and the A system are recorded on the physical medium 3. And a portion is recorded in the fourth week data a4 of the physical media 5, and configure a physical media group 2 for recording and the remaining data of the fourth week data a4 of the A system.

  In the first backup of the system A, this system records the backup data after assigning the physical medium 1 to the physical media group 1. Similarly, in the backup of the B system in the first week, after switching to the physical media group 2 and assigning the physical media 2, the backup data is recorded. Since one week has passed in the backup of the second week, the backup data is recorded by switching to the physical media group 2 in the backup of the A system. If the physical media becomes full during data recording, additional physical media is allocated to the physical media group. Thereafter, backup data is recorded in the same manner as shown in FIG.

  That is, in this example, the physical media 1, 4 and 6 are set as the physical media group 1, and the physical media 2, 3, and 5 are set as the physical media group 2. Management information for recording at least all generations of backup data in a certain system is stored in the management tables shown in FIGS.

  According to this example, compared with the case where the physical media are not shared in the backup of the A and B systems, the data is stored efficiently and the backup data of all generations are prevented from being lost across the respective systems. be able to. More specifically, assuming that the physical media capacity is 800 GB and each backup data capacity is 500 GB, if the backup data of the A and B systems is stored without sharing the physical media, 8 physical media are required. On the other hand, the number of physical media required when stored by this method can be reduced to six.

[Third example]
The example shown in FIG. 4 is for explaining an example of parallel processing in which switching of physical media is managed in units of jobs. There are two recording media, physical media 1 and 2, and the physical media 1 includes The physical media group 1 for recording the first week data a1 of the A system, the second week data b2 of the B system, the third week data a3 of the A system, and the fourth week data b4 of the B system is set, and further physical media 2, the physical media group 2 for recording the first week data b1 of the B system, the second week data a2 of the A system, the third week data b3 of the B system, and the fourth week data a4 of the A system is set. .

  That is, in this example, management information in which backup data for each generation of each system is recorded alternately for each generation is stored in the management tables shown in FIGS. 9 and 10 in the two physical media 1 and 2. .

  In this example, in the backup of the A and B systems in the first week, since the number of parallel processes is 2, physical media 1 and 2 are allocated to the physical media groups 1 and 2, and the A system backup is allocated to the physical media group 1. Data is recorded in the physical media group 2 with backup data of the B system by parallel processing. In the backup of the A and B systems in the second week, since one week has passed, the backup data of the A system is recorded in the physical media group 2 and the backup data of the B system is recorded in the physical media group 1 by parallel processing. Thereafter, backup data can be recorded as shown in FIG.

  In the case of the configuration shown in FIG. 4, even if one physical medium is damaged, backup data of another generation is always recorded on another physical medium, so that one of the systems is the latest generation and the other system. Can secure the previous generation of backup data and prevent the loss of all generations of backup data across systems.

[Operation]
Next, a control flow by the control unit 500 that realizes the generation data management method according to the present embodiment will be described with reference to the drawings.
When the backup system receives an instruction to execute a backup job of the designated system from the data recording request unit 100, the backup system executes job start processing. In this job start process, as shown in FIG. 7, the control unit 500 refers to the management table of FIG. 10 to determine whether the number of active physical media groups is smaller than the number of parallel processes for performing backup of a plurality of jobs in parallel. Step S70 for determining whether or not when it is determined in Step S70 that it is small, Step S71 for executing processing for switching the physical media group, and determining whether or not the state of the physical media group switched in Step S71 is an idle state Step S72, step S73 for changing to the active state when it is determined that the idle state is determined in step S72, step S74 for starting a backup processing job on the physical media of the physical media group changed to the active state, In step S70 If it is determined that the number of active physical media groups is not equal to or greater than the number of parallel processes, or if it is determined in step S72 that it is not in the idle state, executing step S75 for registering in the job waiting list causes the idle state Backup processing can be started by changing the physical media of the physical media group to active, and when the physical media of the physical media group is not idle (active or invalid), the backup job is added to the job completion waiting list. And the backup job can be executed after the job being executed is completed.

  As shown in FIG. 5, the detailed operation of step S71 for executing the process of switching the physical media group is performed by the controller 500 as to whether or not the current physical media group is set for the job, as shown in FIG. When determining with reference to the management table in step S50 and the job in which the physical media group is set in step S50, the current time (computer system time) is the physical set in the management table of FIG. It is determined whether or not the media switching date / time has been exceeded. When it is determined that the media switching date / time has not been exceeded, the process is terminated, and when it is determined in step S51 that the set date / time has been exceeded, The current physical media group number. It executes step S52 to set the number (value) obtained by adding 1 to the remainder (modulo) divided by the number. The processing in step S52 is for cyclically changing the physical media group number between the minimum physical media group number and the maximum physical media group number. When there are two physical media group numbers, 1 → 2 → 1 → 2... For circulation.

  Next, after changing the physical media group number in step S52, the control unit 500 adds "backup reference date and time and integer multiple of backup cycle" to "physical media group switching date and time" in the management table of FIG. By executing step S53 for setting the date and time in the near future, the operation is performed so as to update the date and time for executing the next backup in the management table shown in FIG. 9, and the physical media can be switched at each backup acquisition cycle. .

  When the control unit 500 determines that the physical media group number is not set in step S50, the control unit 500 searches the current physical media group number of the defined job, and the physical unit of the physical media group with the smallest number of assignments to the job. By executing step S57 for setting the media group number (the youngest group number in the case of the same number) and proceeding to step S53 described above, the number of jobs assigned to the physical media group can be averaged. For example, if the number of physical media groups is two and the number of jobs assigned to each physical media group is different, an additional job is assigned to the job of the smaller physical media group, and the number of jobs assigned to each physical media group is the same. In this case, an additional job is assigned to a physical media group having a small (small) physical media group number.

  By executing the physical media group switching process according to each step shown in FIG. 5, the control unit 500 according to the present embodiment switches the physical media group to be backed up, and when a backup of a new job is added from the upper level, New jobs can be assigned to physical media groups with a small number of assignments.

  In addition, when the physical medium becomes full during the execution of the backup job in step S74 in FIG. 7, this system can also perform a physical media allocation process for adding a new physical medium to the physical media group. Explained.

  In this physical media allocation process, as shown in FIG. 6, the control unit 500 determines whether or not the physical media set in the physical media group has free capacity, and if there is no free capacity in step S60. When the determination is made, the new physical medium can be added to the physical media group by step S61 of selecting a new physical medium to be allocated to the physical media group and step S62 of allocating the selected physical medium to the physical media group.

This system executes job end processing after the backup job in step S74 of FIG. 7 is completed. This job end processing will be described next.
As shown in FIG. 8, in this job end process, the control unit 500 changes the state of the physical media group for which the backup process has ended to the idle state, and whether there is a waiting job registered in the job waiting list. Step S81 for ending the process when it is determined that there is no waiting job, Step S82 for extracting the waiting job registered in the job waiting list when it is determined that there is a waiting job in Step S81, Step S83 for starting the backup job by executing the processing shown in FIG. 7 for the extracted waiting job, and determining whether or not the backup result is a job start following step S83. Returning to step S81, the process is not completed after a backup job is completed in step S84. Of determining whether the waiting job can start a waiting job when there is a waiting job.

  As described above, the generation data management method and the backup system according to the present embodiment cause a failure in a physical medium such as a magnetic tape by switching the physical medium at each backup acquisition period and performing backup of data by job and generation. Even when it occurs, at least one generation before generation data can be prevented from being lost.

1 is a conceptual diagram of a basic configuration of a backup system to which the present invention is applied. The figure explaining the generation data management method by the 1st principle of this embodiment. The figure explaining the generation data management method by the 2nd principle of this embodiment. The figure explaining the generation data management method by the 3rd principle of this embodiment. FIG. 10 is a flowchart of physical media group switching processing according to the present embodiment. The physical media allocation processing flow figure by this embodiment. The figure which shows the physical media allocation processing flow by this embodiment. The backup job start processing flowchart by this embodiment. The backup job end processing flowchart. The physical media group switching management table figure by this embodiment. The physical media group management table figure by this embodiment.

Explanation of symbols

1-6: Physical media, 100: Data recording request unit, 200: User interface unit, 400: Physical media switching unit, 500: Control unit, a1 to a4, b1 to b4: Backup data by job and generation.

Claims (12)

A data recording / reproducing unit for recording / reproducing data on / from a plurality of recording media grouped with a group number, and a recording medium switching unit for selectively switching a recording medium for recording / reproducing data by the data recording / reproducing unit; A data storage requesting unit that requests the recording medium switching unit to record data by generation every predetermined time of the same job, and a control unit that controls the medium switching unit. A backup system for backing up data at predetermined time intervals,
The control unit is
A recording medium group switching management table storage unit storing a job identifier for identifying the job, a recording medium group number set in the job identifier, and recording medium switching date and time information for specifying a date and time for switching the recording medium by generation;
Number circulation means for cyclically changing the medium group number between a minimum recording medium group number and a maximum recording medium group number;
A receiving step of receiving a generation data backup command specifying a job from the data storage request unit;
An identifier determination step for determining whether or not a recording medium group number is set in a job identifier corresponding to a backup command job received by the reception step, based on the presence or absence of a job identifier stored in the medium group switching management table storage unit When,
When it is determined in the identifier determination step that a recording medium group number is set, a switching date and time for determining whether or not the switching date and time specified by the recording medium switching date and time information in the medium group switching management table storage unit has been reached A determination process;
A group switching step of changing the recording medium group number by one from the minimum recording medium group number to the maximum recording medium group number by the number circulation means when it is determined in the switching date determination step that the switching date has been reached When,
A backup system that executes a recording step of recording generation-specific data on a recording medium with a recording medium group number changed by the group switching step using a data recording / reproducing unit. Storing the medium group number, a recording medium number defined in the recording medium group number, and status information of either an idle state or an active state of the recording medium defined in the medium group number; A recording medium group management table storage unit that selectively sets an active state or an idle state corresponding to a recording medium of a number;
The control unit is
When it is determined in the identifier determining step that the recording medium group number is set, the status of the recording medium with the set recording medium group number is referred to the status information stored in the medium group management table storage unit. A state determination step for determining
2. The state change step of changing the recording medium of the recording medium group number determined to be in the idle state in the state determination step to an active state and storing the changed state information in a recording medium group management table storage unit is executed. The described backup system. When the control unit determines that a recording medium group number is not set in the identifier determining step, the new job identifier of the backup command received by the receiving step is recorded in the recording medium group of the recording medium group switching management table storage unit. The backup system according to claim 1, wherein a registration step of registering in the system is executed. When the control unit performs the registration step, the number of jobs assigned to each recording medium group is counted for each recording medium group in the recording medium group switching management table storage unit, and the recording medium group with the smallest number is counted. The backup system according to claim 3, wherein a new job identifier is additionally registered in. When the control unit records generation data by using the data recording / reproducing unit in the step, it determines whether or not the capacity of the generation data to be recorded exceeds the remaining recording capacity of the recording medium. The backup system according to any one of claims 1 to 4, wherein when the determination is made, a plurality of recording steps are performed in which generation data is divided and recorded on a plurality of recording media in the same recording medium group. In the step, the control unit determines whether or not the number of received jobs exceeds the number of recording medium groups stored in the medium group switching management table storage unit. The backup system according to claim 1, wherein a standby process for waiting for a job exceeding the number is executed. A data recording / reproducing unit for recording / reproducing data on / from a plurality of recording media grouped with a group number, and a recording medium switching unit for selectively switching a recording medium for recording / reproducing data by the data recording / reproducing unit; A data storage requesting unit that requests the recording medium switching unit to record data by generation every predetermined time of the same job, and a control unit that controls the medium switching unit. A generation data management method for a computer system that backs up data at predetermined time intervals,
In the control unit,
A recording medium group switching management table storage unit storing a job identifier for identifying the job, a recording medium group number set in the job identifier, and recording medium switching date and time information for specifying a date and time for switching the recording medium by generation;
A number circulation means for cyclically changing the medium group number between a minimum recording medium group number and a maximum recording medium group number;
A receiving step of receiving a generation data backup command specifying a job from the data storage request unit;
An identifier determination step for determining whether or not a recording medium group number is set in a job identifier corresponding to a backup command job received by the reception step, based on the presence or absence of a job identifier stored in the medium group switching management table storage unit When,
When it is determined in the identifier determination step that a recording medium group number is set, a switching date and time for determining whether or not the switching date and time specified by the recording medium switching date and time information in the medium group switching management table storage unit has been reached A determination process;
A group switching step of changing the recording medium group number by one from the minimum recording medium group number to the maximum recording medium group number by the number circulation means when it is determined in the switching date determination step that the switching date has been reached When,
A generation data management method for executing a recording step of recording generation-specific data on a recording medium with a recording medium group number changed by the group switching step using a data recording / reproducing unit. Storing the medium group number, a recording medium number defined in the recording medium group number, and status information of either an idle state or an active state of the recording medium defined in the medium group number; A recording medium group management table storage unit that selectively sets an active state or an idle state corresponding to the recording medium of the number;
In the control unit ,
When it is determined in the identifier determining step that the recording medium group number is set, the status of the recording medium with the set recording medium group number is referred to the status information stored in the medium group management table storage unit. A state determination step for determining
8. A state change step of changing a recording medium having a recording medium group number determined to be in an idle state in the state determination step to an active state and storing the changed state information in a recording medium group management table storage unit is executed. The generation data management method described. When the control unit determines that a recording medium group number is not set in the identifier determining step, the new job identifier of the backup command received by the receiving step is recorded in the recording medium group of the recording medium group switching management table storage unit. The generation data management method according to claim 7 or 8, wherein a registration step of additionally registering the data is executed. When the control unit performs the registration step, the number of recording media registered in each recording medium group is calculated based on the number of recording medium numbers in the recording medium group management table storage unit, and the recording with the smallest number is calculated. The generation data management method according to claim 9 , wherein a new job identifier is additionally registered in the medium group. When the control unit records generation data by using the data recording / reproducing unit in the step, it determines whether or not the capacity of the generation data to be recorded exceeds the remaining recording capacity of the recording medium. The generation data management method according to any one of claims 7 to 10, wherein when the determination is made, a plurality of recording steps of dividing and recording generation-specific data on a plurality of recording media in the same recording medium group are executed. In the step, the control unit determines whether or not the number of received jobs exceeds the number of recording medium groups stored in the medium group switching management table storage unit. The generation data management method according to any one of claims 7 to 11, wherein a standby step for waiting for a number of jobs exceeding the number is executed.

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