JPWO2013140765A1 - Backup device, backup method, and backup system in offline backup method - Google Patents

Abstract

Using the backup success / failure information from the backup target computer, the backup concurrent execution number control means estimates the maximum number of simultaneous backup executions this time, and controls the backup execution number of the backup target computer so that it does not exceed the backup number. The data storage means stores backup data from the backup target computer whose number of executions is controlled.

Description

  The present invention relates to a backup device, a backup method, and a backup system in an offline backup system.

  A technique for performing offline backup in a database is known. In this offline backup technology, the database in operation is restarted once, and the connection from the user is disconnected, and then all the files in the database are backed up.

  An example of an offline backup technique is described in Patent Document 1. Patent Document 1 discloses an offline backup technology and mentions that a plurality of target systems (backup target computers) are backed up by one or an unspecified number of archiving server systems (backup computers).

JP 2006-120132 A

  However, in the technique described in Patent Document 1 described above, there is no mention of an appropriate number of backup target computers that can be backed up simultaneously. Therefore, the technique described in the technical document 1 causes the backup computer to freeze when the simultaneous backup is performed on the appropriate number of backup target computers. As a result, there is a problem in that a situation such as failure of backup processing and loss of data in the worst case occurs. Further, originally, when estimating the appropriate number of simultaneous backups, it is necessary to comprehensively determine the appropriate number from the remaining processing capacity of the backup computer and the amount of backup data of each backup target computer. However, such a determination has a high possibility that the processing becomes complicated and hinders the backup processing. Therefore, there is a need for a method that can easily calculate the estimated number.

  An object of the present invention is to provide a method for automatically determining the number of simultaneous backups to be performed and a backup system in an offline backup method that can solve the above-described problems.

The backup device according to one aspect of the present invention is
Network communication means for controlling transmission and reception of data from the backup target computer;
A backup data storage unit for receiving and storing backup data of the backup target computer received via the network communication means;
A backup success / failure storage unit for storing success / failure information of the backup up to the previous time;
A backup simultaneous execution number control unit for estimating the maximum number of simultaneous backup executions using the backup success / failure information up to the previous time in the backup success / failure storage unit and controlling the number of backup executions.

A backup system according to an aspect of the present invention includes a backup device and a backup target computer,
The backup device is
Network communication means for controlling transmission and reception of data from the backup target computer;
Backup data storage means for receiving and storing backup data of the backup target computer received via the network communication means;
A backup success / failure storage unit for storing success / failure information of the backup up to the previous time;
A backup concurrent execution number control unit that estimates the maximum number of simultaneous backups executed this time using the backup success / failure information of the backup success / failure storage unit, and controls the number of backup executions;
Including
The backup target computer is:
A data storage unit for storing data to be backed up;
When it is difficult to communicate with the backup device, a backup data temporary storage unit that stores backup data from a portion that could not be transmitted to the backup device instead;
A network communication unit that controls transmission and reception of data and detects that communication with the backup device is difficult;
When it is difficult to communicate with the backup device, a backup destination load determination unit that continues to monitor the backup computer periodically until normal operation can be confirmed;
Make the backup target computer ready for offline backup, send backup data to the backup device, and if it is difficult to communicate with the backup device, save the backup data in the backup data temporary storage unit of the backup target computer And a control unit that retransmits the communication at a communicable time and records the success or failure of the backup in the backup success / failure storage unit.

The backup method according to one aspect of the present invention uses the success / failure information of the backup from the backup target computer, and the backup simultaneous execution number control means of the backup device estimates the maximum number of simultaneous simultaneous executions of this backup, and exceeds the number. Control the number of backup executions of the computer to be backed up so that
The backup data storage means stores backup data from the backup target computer whose number of executions is controlled.

The storage medium according to one aspect of the present invention uses the backup success / failure information of the backup success / failure storage means from the backup target computer, the backup simultaneous execution number control means estimates the current maximum simultaneous execution number of backups, Control the number of backup executions of the backup target computer so that it does not exceed,
The backup data storage means stores a program that causes the backup device to execute processing for storing backup data from the backup target computer whose number of executions is controlled.

  According to the present invention, simultaneous backup to an appropriate number of computers can be performed in the offline backup method.

FIG. 1 is a block diagram showing the configuration of the first embodiment of the present invention. FIG. 2 is a diagram illustrating a hardware configuration in which the backup system 1000 according to the first embodiment is realized by a computer device and its peripheral devices. FIG. 3 is a flowchart showing the backup maximum concurrent execution number estimation operation in the backup computer 1 according to the first embodiment. FIG. 4 is a flowchart showing the simultaneous backup execution number control operation in the backup computer 1 according to the first embodiment. FIG. 5 is a flowchart showing an offline backup operation in the backup target computers 2, 3, and 4 in the first embodiment.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

[First embodiment]
FIG. 1 is a block diagram showing a configuration of a backup system 1000 according to the first embodiment of this invention. Referring to FIG. 1, the backup computer 1 includes a backup success / failure storage unit 101, a backup simultaneous execution number estimation unit 102, a backup data storage unit 103, and a network communication unit 104. In addition, the backup target computers 2, 3, and 4 include data storage units 201, 301, and 401, backup data temporary storage units 202, 302, and 402, backup destination load determination units 203, 303, and 403, and network communication unit 204. , 304, 404 and control units 205, 305, 405. The backup computer 1 and the backup target computers 2, 3, 4 are each connected by a LAN (local area network) 5.

  Next, the configuration of the backup computer 1 and the backup target computers 2, 3, 4 in the first embodiment will be described. In this embodiment, the number of backup target computers is three, but the number is not limited.

  The backup success / failure storage unit 101 stores backup success / failure information, that is, information on the estimation result of the maximum concurrent execution number in the previous backup and information on whether or not each backup target computer actually ended normally. To do. For example, the backup success / failure storage unit 101 stores backup success / failure information in a list for each backup history such as the previous time and the previous time. The number of backups to be listed and stored (the number of backup information histories) can be arbitrarily determined by the system administrator, but at least the previous backup success / failure information is always stored. Further, the storage format may not be a list.

  The backup simultaneous execution number control unit 102 calculates the actual number of units successfully completed in the previous backup from the backup success / failure information stored in the backup success / failure storage unit 101 before the backup is started, The maximum number of concurrent executions of this backup is calculated using the formula. Further, the backup simultaneous execution number control unit 102 controls the backup of the backup target computers 2, 3, and 4 with the calculated number as the maximum value of the simultaneous execution number.

  The backup data storage unit 103 receives backup data of the backup target computer and stores it for each computer.

  The network communication units 104, 204, 304, and 404 control data transmission / reception as an interface with the LAN 5. When transmission of data to be backed up (backup data) is interrupted at the time of backup, the backup computer 1 may be frozen. In this case, the network communication units 204, 304, and 404 notify the backup destination load determination units 203, 303, and 403 of each backup target computer of information indicating the state of the backup computer 1. The status information of the backup computer 1 includes a notification of backup destination communication interruption. In this case, since the backup destination is the backup computer 1, the interruption of backup destination communication means that the backup computer 1 is in a state where it cannot communicate. For example, when it is difficult to transmit backup data due to an excessive load on the backup computer 1, the backup computer 1 generates a notification of backup destination communication interruption, and transmits it in information indicating the status.

  The data storage units 201, 301, and 401 are data storage units of each backup target computer, and store backup data.

  Backup data temporary storage sections 202, 302, and 402 temporarily store backup data from each computer. For example, when the backup destination load determination unit 203, 303, 403 determines that transmission of backup data is difficult due to the excessive load of the backup computer 1 based on the information indicating the state, the backup data is not transmitted, The backup data temporary storage units 202, 302, and 402 store the backup data. In this case, the backup data temporary storage units 202, 302, and 402 store the backup data from the portion determined to be difficult to transmit based on instructions from the backup destination load determination units 203, 303, and 403.

  The control units 205, 305, and 405 control the restart of each computer, the startup of the backup program, and the storage and transmission of backup data based on instructions from the backup destination load determination units 203, 303, and 403.

  The backup destination load determination units 203, 303, and 403 transmit confirmation information to the backup computer 1 when receiving a notification of backup destination communication interruption from the network communication units 204, 304, 404 during data backup. Further, it is confirmed whether or not it is operating normally by the response.

  If the backup destination load determination unit 203, 303, 403 determines that the communication is interrupted by the confirmation, the backup destination load determination unit 203, 303, 403 instructs the control unit 205, 305, 405 to interrupt data transmission to the backup computer 1, and the remaining The control units 205, 305, and 405 are instructed to save (transfer) the backup data to the backup data temporary storage units 202, 302, and 402. In addition, the backup destination load determination units 203, 303, and 403 continuously transmit confirmation information to the backup computer 1 periodically when communication is interrupted to confirm whether or not it is operating normally.

  When communication with the backup computer 1 is restored and backup data to be transferred to the backup data temporary storage units 202, 302, and 402 still remains, the backup destination load determination units 203, 303, and 403 are controlled by the control unit 205, Instructors 305 and 405 to cancel the transfer. Further, the backup destination load determination units 203, 303, and 403 instruct the control units 205, 305, and 405 to send the remaining backup data to the backup computer 1 again. Upon receiving the instruction, the control units 205, 305, and 405 transmit the backup data to the backup computer 1.

  In this embodiment, the control units 205, 305, and 405 complete the transfer of the remaining backup data after the communication recovery to the backup data temporary storage units 202, 302, and 402, and then the control units 205, 305, and 405 All backup data transferred to the temporary data storage units 202, 302, and 402 may be transmitted to the backup computer 1. When transmission of all backup data to the backup computer 1 is completed, the control units 205, 305, and 405 save data in the backup data temporary storage units 202, 302, and 402 in the current backup in the list of the backup success / failure storage unit 101. Records whether or not If it does not occur, it is determined as normal termination, and if it occurs, it is determined as failure.

  FIG. 2 is a diagram showing a hardware configuration in which the backup system 1000 according to the first embodiment of the present invention is realized by a computer and its peripheral devices. As shown in FIG. 2, the backup computer 1 and the backup target computers 2, 3, 4 are CPUs 11, 21, 31, 41, output devices 12, 22, 32, 42, input devices 13, 23, 33, 43. Main storage devices 14, 24, 34, 44 and secondary storage devices 15, 25, 35, 45. The backup computer 1 and the backup target computers 2, 3, 4 are connected to the LAN 5 via the network interfaces 10, 20, 30, 40. The network interfaces 10, 20, 30, and 40 correspond to the network communication units 104, 204, 304, and 404 in FIG.

  The CPUs 11, 21, 31, and 41 operate the operating system to control the entire backup computer 1 and backup target computers 2, 3, and 4 according to the first embodiment of the present invention. Further, the CPUs 11, 21, 31, and 41 read out programs and data from the secondary storage devices 15, 25, 35, and 45 to the main storage devices 14, 24, 34, and 44, for example, and perform simultaneous backup in the first embodiment. Various processes are executed as the execution number control unit 102, the backup destination load determination units 203, 303, 403, and the control units 205, 305, 405.

  The secondary storage devices 15, 25, 35, and 45 are, for example, optical disks, flexible disks, magnetic optical disks, external hard disks, semiconductor memories, and the like, and record computer programs so that they can be read by a computer. The computer program may be downloaded from an external computer (not shown) connected to the communication network.

  The input devices 13, 23, 33, and 43 are realized by, for example, a mouse, a keyboard, a built-in key button, and the like, and are used for an input operation. The input devices 13, 23, 33, and 43 are not limited to a mouse, a keyboard, and built-in key buttons, and may be, for example, a touch panel.

  The output devices 12, 22, 32, and 42 are realized by a display, for example, and are used for confirming the output.

  Note that the block diagram (FIG. 1) used in the description of the first embodiment shows functional unit blocks, not hardware unit configurations. These functional blocks are realized by the hardware configuration shown in FIG. However, the means for realizing each unit included in the backup computer 1 and the backup target computers 2, 3, 4 are not particularly limited. That is, the backup computer 1 and the backup target computers 2, 3, 4 may be realized by one physically coupled device, or two or more physically separated devices are connected by wire or wirelessly. These may be realized by a plurality of devices.

  Further, the CPUs 11, 21, 31, and 41 read the computer programs recorded in the secondary storage devices 15, 25, 35, and 45, and according to the programs, the backup simultaneous execution number control unit 102, the backup destination load determination unit 203, 303, 403, and control units 205, 305, 405 may be operated.

  The recording medium (or storage medium) in which the program code is recorded is a non-volatile recording medium, which is supplied to the backup computer 1 and the backup target computers 2, 3, and 4. The target computer 2, 3, 4 may read and execute the code of the program stored in the recording medium. That is, the present invention temporarily stores or non-temporarily stores software (backup program) to be executed by the backup computer 1 and the backup target computers 2, 3, 4 in the first embodiment. Secondary storage devices 15, 25, 35, 45 are also included.

  The operation of the backup system 1000 configured as described above will be described with reference to the flowcharts of FIGS. 3, 4, and 5.

  FIG. 3 is a flowchart showing an outline of the operation of estimating the maximum backup concurrent execution number in the backup computer 1 in the first embodiment. Note that the processing according to this flowchart may be executed based on the above-described program control by the CPU.

  As shown in FIG. 3, the backup simultaneous execution number control unit 102 first stores backup success / failure information in the previous backup, that is, the backup success / failure status estimated in the previous backup and the backup success / failure status. Read from the unit 101 (step S101).

  If the previous backup success / failure information is not stored due to the initial operation of the backup system 1000 (step S102), the backup simultaneous execution number control unit 102 determines a certain number (for example, “1”) from the total number of backups at this time. ) Is estimated as the maximum number of concurrent executions in the current backup (step S103).

  If the actual number of backups successfully completed last time is less than half of the maximum number of simultaneous backups estimated last time (step S104), the simultaneous backup number control unit 102 estimates the maximum simultaneous backups estimated last time. The number obtained by subtracting a certain number (for example, “1”) from the number is estimated as the current maximum backup concurrent execution number (step S105).

  If NO in both steps S102 and S104, the backup simultaneous execution number control unit 102 adds the fixed number (for example, “1”) to the current backup maximum simultaneous execution number from the number of the backups that have been normally completed last time. Estimate (step S106).

  Finally, the backup simultaneous execution number control unit 102 records the estimated maximum number of simultaneous executions of the current backup in the list of the backup success / failure storage unit 101 (step S107).

  Note that the number of units reduced in steps S103 and S105 and the number of units added in step S106 are “1”, but the administrator may arbitrarily set or change them according to the system status. If there is a tendency for the number of backups to increase, the maximum number of backup simultaneous executions will converge faster if the number added in step S106 is changed to “2” or more.

  Thus, the backup computer 1 ends the operation of estimating the maximum number of simultaneous execution backups.

  FIG. 4 is a flowchart showing an outline of the operation of the simultaneous backup execution number control in the backup computer 1 in the first embodiment. Note that the processing according to this flowchart may also be executed based on the above-described program control by the CPU.

  As shown in FIG. 4, first, the network communication unit 104 of the backup computer 1 receives backup access from the backup target computers 2, 3, 4, and the current backup maximum concurrent execution number control unit 102 controls the backup computer 1. An execution instruction is notified (step S201).

  Next, the backup maximum concurrent execution number control unit 102 determines whether or not the currently executed backup number is less than the current maximum backup concurrent execution number estimated in step S103, step S105, or step S106 (step S103). S202). If it is less than the maximum number of simultaneous backups executed at this time, the maximum backup simultaneous execution number control unit 102 starts off-line backup to the backup target computers 2, 3, 4 in order to accept the backup data. An instruction is given via 104 (step S203).

  When the number of backups currently being executed exceeds the current maximum backup simultaneous execution number estimated in step S103, step S105, or step S106, the backup maximum simultaneous execution number control unit 102 determines whether the backup target computers 2, 3, The backup data of No. 4 is not accepted, and a standby for offline backup is instructed (step S204).

  If backup of one of the backup target computers 2, 3, 4 being backed up is completed (step S 205), the backup maximum simultaneous execution number control unit 102 determines whether the backup target computers 2, 3, In order to accept the backup of the first one of 4 that is waiting, an offline backup start is instructed (step S206).

  Thus, the backup computer 1 ends the operation of the simultaneous backup execution number control.

  FIG. 5 is a flowchart showing an outline of the offline backup operation in the backup target computers 2, 3, and 4 in the first embodiment. Note that the processing according to this flowchart may also be executed based on the above-described program control by the CPU.

  As shown in FIG. 5, first, the control units 205, 305, and 405 access the backup computer 1 to execute offline backup (step S301).

  If the backup computer 1 has not instructed the start of offline backup (step S302), the control units 205, 305, and 405 wait for the execution of offline backup until instructed to start the offline backup (step S303).

  When the backup computer 1 instructs the start of offline backup, the control units 205, 305, and 405 start the OS restart and the backup program (step S304).

  The control units 205, 305, and 405 transmit the backup data of the data storage units 201, 301, and 401 to the backup data storage unit 103 of the backup computer 1 via the network communication units 204, 304, and 404 (step S305).

  If the network communication units 204, 304, 404 detect the interruption of the transmission of the backup data to the backup computer 1 (determined that the backup destination communication is interrupted) (step S 306), the information indicating the state of the backup computer 1 Is notified to the backup destination load determination units 203, 303, and 403. Further, the backup destination load determination units 203, 303, and 403 confirm whether the backup computer 1 is operating normally based on the response information to the confirmation information (step S307). The confirmation method may be any method such as pinging the backup computer 1 as confirmation information.

  If the backup destination load determination units 203, 303, and 403 cannot confirm that the backup computer 1 is operating normally (step S307), the control units 205, 305, and 405 send the backup computer 1 to the backup computer 1. The backup data transmission is interrupted, and the remaining backup data is started to be saved in the respective backup data temporary storage units 202, 302, and 402 (step S308).

  The backup destination load determination units 203, 303, and 403 periodically transmit confirmation information to the backup computer 1 to continue monitoring, and when normal operation can be confirmed again (step S309), the control unit 205, 305 and 405 transmit the remaining data to the backup computer 1 again (step S310). Thereafter, the control units 205, 305, and 405 transmit all backup data saved in the backup data temporary storage units 202, 302, and 402 to the backup computer 1 (step S311).

  When the data saving to the backup data temporary storage units 202, 302, and 402 is completed before the normal operation can be confirmed again (step S312), after the normal operation of the backup computer 1 is confirmed, the control units 205, 305, 405 transmits all the backup data in the backup data temporary storage units 202, 302, and 402 to the backup computer 1 (step S313).

  After transmitting all the backup data to the backup computer 1, the control units 205, 305, and 405 are added to the list of the backup success / failure storage unit 101 of the backup computer 1 to the backup data temporary storage units 202, 302, and 402 in the current backup. It is recorded whether or not the data evacuation has occurred (step S314). The control units 205, 305, and 405 record the case where the error does not occur as a normal end and the case where the error occurs as a failure.

  Finally, the control units 205, 305, and 405 switch the backup target computers 2, 3, and 4 to the normal operation mode (step S315). The end of the backup program, the control units 205, 305, and 405 execute necessary processes such as starting the normal operation program and restarting the OS as appropriate.

  As described above, the backup target computers 2, 3, and 4 finish the offline backup operation.

  Next, effects of the first exemplary embodiment of the present invention will be described.

  The above-described backup system 1000 according to the present embodiment can easily estimate the maximum number of backup simultaneous executions.

  This is because the following configuration is included. That is, firstly, the backup success / failure storage unit stores the previous backup success / failure information, that is, the estimate of the maximum number of backup simultaneous executions and the actual normal end number. Secondly, the backup simultaneous execution number control unit calculates an estimate of the current maximum backup simultaneous execution number from these numerical values. This allows the backup concurrent execution number control unit to calculate the maximum number of backup concurrent executions without investigating the remaining processing capacity of the backup computer or the amount of backup data of each backup target computer. The maximum number of simultaneous backups can be estimated.

  Each component in each embodiment of the present invention described above can be realized by a computer apparatus and firmware based on program control as well as by realizing the function in hardware. The program is provided by being recorded on a computer-readable recording medium such as a magnetic disk or a semiconductor memory, and is read by the computer when the computer is started up. The read program causes the computer to function as a component in each of the embodiments described above by controlling the operation of the computer.

  Although the present invention has been described with reference to each embodiment, the present invention is not limited to the above embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

  For example, each component described in each of the above embodiments does not necessarily have to be individually independent. For example, for each component, a plurality of components may be realized as one module, or one component may be realized as a plurality of modules. Each component is configured such that a component is a part of another component, or a part of a component overlaps a part of another component. Also good.

  Further, in each of the embodiments described above, a plurality of operations are described in order in the form of a flowchart, but the described order does not limit the order in which the plurality of operations are executed. For this reason, when each embodiment is implemented, the order of the plurality of operations can be changed within a range that does not hinder the contents.

  Furthermore, in each embodiment described above, a plurality of operations are not limited to being executed at different timings. For example, another operation may occur during the execution of a certain operation, or the execution timing of a certain operation and another operation may partially or entirely overlap.

  Furthermore, in each of the embodiments described above, a certain operation is described as a trigger for another operation, but the description does not limit all relationships between the certain operation and the other operations. For this reason, when each embodiment is implemented, the relationship between the plurality of operations can be changed within a range that does not hinder the contents. The specific description of each operation of each component does not limit each operation of each component. For this reason, each specific operation | movement of each component may be changed in the range which does not cause trouble with respect to a functional, performance, and other characteristic in implementing each embodiment.

  This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2012-061321 for which it applied on March 19, 2012, and takes in those the indications of all here.

1 Backup computer 2, 3, 4 Backup target computer 5 LAN
10, 20, 30, 40 Network interface 11, 21, 31, 41 CPU
12, 22, 32, 42 Output device 13, 23, 33, 43 Input device 14, 24, 34, 44 Main storage device 15, 25, 35, 45 Secondary storage device 101 Backup success / failure storage unit 102 Backup simultaneous execution number control Unit 103 Backup data storage unit 104, 204, 304, 404 Network communication unit 201, 301, 401 Data storage unit 202, 302, 402 Backup data temporary storage unit 203, 303, 403 Backup destination load determination unit 205, 305, 405 Control Part

The program according to one aspect of the present invention uses the backup success / failure information of the backup success / failure storage means from the backup target computer to estimate the backup simultaneous execution number control means for the current backup maximum simultaneous execution number, and exceeds that number. Control the number of backup executions of the computer to be backed up so that
The backup data storage means causes the backup device to execute processing for storing backup data from the backup target computer whose number of executions is controlled.

Claims (10)

Network communication means for controlling transmission and reception of data from the backup target computer;
Backup data storage means for storing backup data of a backup target computer received via the network communication means;
Backup success / failure storage means for storing backup success / failure information up to the previous time;
A backup apparatus comprising: a backup simultaneous execution number control unit that estimates the maximum number of simultaneously executed backups using the backup success / failure information up to the previous time of the backup success / failure storage unit and controls the number of backup executions. The backup concurrent execution number control means subtracts a certain number from the previously estimated backup maximum concurrent execution number when the number of computers to be backed up normally completed at the time of the previous backup is less than half of the previously estimated maximum backup concurrent execution number. The number of
In addition, if the number of backup target computers that ended normally at the time of the previous backup exceeded half of the maximum number of backup simultaneous executions estimated last time, add a certain number to the number of backup target computers that ended normally last time,
In addition, when there is no information at the time of the previous backup in the first backup, the number obtained by subtracting a certain number from the total number of the current backup is estimated as the maximum number of simultaneous backups executed this time. Backup device. Including a backup device and a backup target computer,
The backup device is
Network communication means for controlling transmission and reception of data from the backup target computer;
Backup data storage means for receiving and storing backup data of the backup target computer received via the network communication means;
Backup success / failure storage means for storing backup success / failure information up to the previous time;
The backup simultaneous execution number control means for estimating the current maximum backup concurrent execution number using the backup success / failure information of the backup success / failure storage means and controlling the number of backup executions,
Including
The backup target computer is:
Data storage means for storing data to be backed up;
Backup data temporary storage means for storing backup data from a portion that could not be transmitted to the backup device when communication with the backup device is difficult;
Network communication means for controlling transmission and reception of data and detecting that communication with the backup device is difficult;
When it is difficult to communicate with the backup device, backup destination load determination means that continues to monitor the backup computer periodically until normal operation can be confirmed;
Make the backup target computer ready for offline backup, send backup data to the backup device, and if it is difficult to communicate with the backup device, save the backup data in the backup data temporary storage means of the backup target computer And a control means for retransmitting at a communicable time and recording the success or failure of the backup in the backup success / failure storage means. The backup concurrent execution number control means subtracts a certain number from the previously estimated backup maximum concurrent execution number when the number of computers to be backed up normally completed at the time of the previous backup is less than half of the previously estimated maximum backup concurrent execution number. The number of
In addition, if the number of backup target computers that ended normally at the time of the previous backup exceeded half of the maximum number of backup simultaneous executions estimated last time, add a certain number to the number of backup target computers that ended normally last time,
In addition, when there is no information at the time of the previous backup for the first backup, the number obtained by subtracting a certain number from the total number of the current backup is estimated as the maximum number of simultaneous backups performed this time. Backup system. Using the backup success / failure information from the computer to be backed up to the previous time, the backup device simultaneous execution number control means estimates the maximum number of simultaneous backups this time, and sets the number of backup target computers to be backed up so that this number is not exceeded. Control
The backup data storage means stores backup data from the backup target computer whose number of executions is controlled. The backup device uses the success / failure information of the previous backups to estimate the maximum number of simultaneous backups executed this time, and controls the number of backups executed according to the result.
When the backup target computer detects that communication with the backup device is difficult, it periodically monitors the backup device until normal operation can be confirmed,
While communication with the backup device is difficult, backup data is saved in the backup data temporary storage means and retransmitted at a communicable time, and the success or failure of the backup is recorded after the backup is completed.
Backup method. The backup device is
If the number of computers to be backed up successfully at the time of the previous backup is less than half of the maximum number of simultaneous backups estimated last time, the number obtained by subtracting a certain number from the maximum number of simultaneous backups estimated last time,
In addition, when the number of backup target computers that ended normally at the time of the previous backup exceeded half of the maximum number of backup simultaneous executions estimated last time, the number of computers that added a certain number from the number of backup target computers that ended normally last time,
The backup method according to claim 5 or 6, wherein, when there is no information at the time of the previous backup in the first backup, the number obtained by subtracting a certain number from the total number of the current backup is estimated as the maximum number of simultaneous backups executed this time. The backup concurrent execution number control means uses the backup success / failure information from the backup target computer up to the previous time to estimate the maximum number of simultaneous backup executions this time, and the number of backup executions of the backup target computer so that it does not exceed that number. Control
A backup data storage means stores a program for causing a backup device to execute a process of storing backup data from the backup target computer whose number of executions is controlled. Estimate the maximum number of simultaneous backups this time using the success / failure information of the backup up to the previous time, let the backup device execute the process to control the number of backups executed according to the estimation result,
When it is detected that communication with the backup device is difficult, the backup device is regularly monitored until normal operation can be confirmed,
A program for causing the backup target computer to execute a process of saving the backup data in the backup data temporary storage means and retransmitting the backup data during a communicable time and recording the success or failure of the backup after the backup is completed while communication with the backup device is difficult A storage medium for storing If the number of backup target computers that ended normally at the time of the previous backup was less than half of the previously estimated maximum number of concurrent backups, the number obtained by subtracting a certain number from the maximum number of simultaneous backups estimated last time,
In addition, when the number of backup target computers that ended normally at the time of the previous backup exceeded half of the maximum number of backup simultaneous executions estimated last time, the number of computers that added a certain number from the number of backup target computers that ended normally last time,
Further, when there is no information at the time of the previous backup in the first backup, the backup device is caused to execute a process of estimating a number obtained by subtracting a certain number from the total number of the current backup as the maximum number of simultaneous executions of the current backup. A storage medium for storing the described program.

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