JP4660404B2 - Data transfer apparatus and data transfer method - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transfer apparatus and a data transfer method, and more particularly to a data transfer apparatus for transferring and storing data stored in an electronic device connected to a network to another apparatus through the network in order to back up the data. The present invention relates to a data transfer method.

  With the development of computer technology, computers are built in electronic devices, and complex operations are becoming possible. In addition, information terminal devices such as personal computers, which are a kind of electronic devices, have become widespread, and with the increase in functionality and functionality, the amount of data handled by information terminal devices has increased and has become more important. For example, most information terminal devices in recent years are used by being connected to a network such as the Internet or a LAN (Local Area Network), and a large amount of data is taken into the information terminal device through the network.

  For this reason, an external storage device such as an optical recording media device or a removable hard disk device is connected to the information terminal device to increase the capacity of data that can be stored in the information terminal device. In addition, the capacity of a hard disk device as a data storage device built in an information terminal device has increased, and in an information terminal device having a built-in TV tuner, a TV program can be recorded using this large-capacity hard disk device. There are also things that can be done.

  On the other hand, as the capacity of the hard disk device of the information terminal device increases, if the hard disk device fails, a large amount of data is lost. Further, there is a risk of being infected with a computer virus through the Internet, and there is a risk that data in the hard disk device may be lost when the virus is infected. For this reason, in information terminal devices, it is becoming more important to back up data stored in the main body using another device. Conventional data backup is performed by periodically transferring and writing data to an external storage device connected to the information terminal device.

  By the way, in addition to the conventional data backup method that is performed by directly connecting an external storage device to the information terminal device, the information terminal device is connected to the network, and the network connected storage device (hereinafter referred to as NAS device) connected to the network. There is a method to backup data by sharing Network Attached Storage. If a NAS device using this network is used as a storage destination, there is no need to exchange media, and the data of the information terminal device can be conveniently backed up and efficiently.

  Such a network system for connecting a plurality of information terminal devices to a predetermined network and connecting NAS devices shared by the plurality of information terminal devices to transfer data and perform backup is disclosed in, for example, Patent Literature 1 is disclosed. The NAS device described in Patent Document 1 functions as a server having a dedicated program, and each information terminal device is described as a client PC. In the NAS device described in Patent Document 1, the backup device is provided outside the NAS device. However, the backup device may be provided inside the NAS device.

Japanese Patent Laying-Open No. 2004-151824 (FIG. 1)

  However, in order to transfer the data stored in a plurality of information terminal devices connected to the network to the NAS device through the network for backup, the data is read on the information terminal device, the data is transferred to the NAS device, Data writing work occurs on the NAS device, the load on the information terminal device side and the NAS device side increases, the information terminal device side foreground task, the information terminal device side due to network bandwidth occupation, and the NAS device side network There was a problem of affecting the transfer task.

  That is, at the time of data backup task, the background task or the task scheduled by the NAS device is called on the information terminal device side, and the information terminal device may start an operation that is not conscious of the user. It was obstructed. Further, in the NAS apparatus, a plurality of server tasks may be operating at the same time, and it is difficult for the user to avoid the influence of backup work on these server tasks. Furthermore, since there are a wide variety of user tasks using information terminal devices, the NAS device cannot predict the user tasks and perform a backup operation.

Accordingly, the present invention provides data for backing up the data to the NAS device while suppressing the influence on the task and network processing on the information terminal device side and not impairing the convenience for the user. It is an object to provide a transfer device and a data transfer method.
In particular, according to the present invention, when an operation on the information terminal device side is predictable, such as a TV program recording reservation process performed on the information terminal device side, the transfer plan is appropriately set to transfer the data on the information terminal device side. An object of the present invention is to provide a data transfer apparatus and a data transfer method capable of performing backup.

  The data transfer apparatus of the present invention that achieves the above object is provided with respect to a network-connected storage apparatus that is incorporated in each of a plurality of information terminal devices connected to a network and performs processing for storing data input through the network. A data transfer device that performs a transfer process of data stored in a device, and means for estimating a network usage amount required for data transfer of data to be transferred from a list of data to be transferred in the information terminal device; Means for predicting the future load state and network usage of the information terminal device from the task currently being executed by the information terminal device and the task scheduled to be executed in the future, the task currently being executed by the storage device, and the future From the task scheduled to be executed, the future load status of the storage device and the network usage A means for predicting, a means for making a data transfer plan between each piece of information terminal equipment and the storage device according to a predicted network usage amount and a task scheduled for future execution of the information terminal equipment and the storage device. It is said.

  The data transfer apparatus may further include means for monitoring creation / update of data to be transferred on the information terminal device, and may automatically create a list of data to be transferred. Further, the data transfer device can be configured to include means for dividing the transfer amount and transferring the predetermined amount of data a plurality of times when transferring the predetermined amount of data.

  In addition, when a list of data on the information terminal device is changed, a task currently being executed or scheduled to be executed in the future on the information terminal device is changed, and a task currently being executed or scheduled to be executed in the future on the NAS device In any case, the data transfer apparatus can be provided with means for reestablishing a data transfer plan between each piece of information terminal equipment and the NAS apparatus.

  Furthermore, the data transfer method of the present invention is a data transfer method in a network in which a plurality of information terminal devices and a NAS device are connected to a network, and the NAS device can store data transferred from each piece of information terminal device. The network usage required for data transfer of the data to be transferred is estimated from the list of data to be transferred in the information terminal device, the task currently being executed by the information terminal device, and the future execution schedule The future load state of the information terminal device and the network usage amount are predicted from the task, and the future load state and network usage amount of the NAS device are determined from the task currently being executed by the NAS device and the task scheduled to be executed in the future. Depending on the predicted network usage and tasks scheduled for future execution of information terminal equipment and NAS devices It is characterized in that make a data transfer plan between each individual and the NAS device of the information terminal device.

  That is, the present invention backs up data on an information terminal device to a NAS device that provides a data storage service via a network, and in particular, creates data to be backed up for a task currently being executed by the information terminal device. Monitor and create a list of data to be backed up, estimate the amount of data transfer from the created list of data to be backed up, and determine the future system load and network from the tasks currently being executed on the information terminal device and the tasks to be executed in the future A transfer amount is predicted, and a data transfer plan is made by predicting a future system load amount and a network transfer amount from a task currently being executed by the NAS device and a task scheduled to be executed in the future.

  In addition, the present invention adjusts the data transfer timing according to the transfer amount and system load between the information terminal device and the NAS device, thereby affecting the influence of the backup processing on other tasks of the information terminal device and the NAS device. It is a highly convenient backup that can be reduced and automatically backed up.

  As described above, according to the data transfer apparatus and method of the present invention, a plurality of information terminals can be used in data transfer between apparatuses that simultaneously execute a plurality of tasks other than user tasks, such as information terminal devices and servers. In a system including a NAS device shared by an information terminal device via a device and a network, it is possible to suppress the influence of data transfer on other tasks of the system and to realize data transfer that does not impair user convenience There is.

  Embodiments of a data transfer apparatus and method according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1A shows the overall configuration of a data transfer apparatus according to the present invention for performing data backup processing. The data transfer apparatus of the present invention is an automatic data backup system, and is composed of a plurality of information terminal devices 1 provided on the user side, a NAS apparatus 4 that provides a backup service, and a network 3 that interconnects them. It is realized in the environment. The information terminal equipment 1 is shown here as N first information terminal equipment 1a to Nth information terminal equipment 1n.

  The network 3 is, for example, a LAN (Local Area Network), the Internet, or a dedicated communication line, and information is transmitted between the information terminal device 1 and the NAS device 4 regardless of wired or wireless. is there.

  The information terminal device 1 is an electronic device such as a plurality of personal computers used by a plurality of users, and includes a data transfer device 2 having a backup program for accessing the NAS device 4 via the network 3 and transmitting and receiving data. ing.

  As shown in FIG. 1B, the data transfer device (backup program) 2 manages a data creation monitoring function module for monitoring creation / update of data to be backed up, and a list of data to be transferred for backup. A list management function module that performs a transfer amount estimation function module that estimates a transfer amount from a list of data to be transferred, an estimated transfer amount, a current task on the information terminal device 1, and a task scheduled to be executed in the future. It is composed of a transfer reservation function module that predicts the future load state and network usage, and determines the transfer timing of backup data through communication with the NAS device 4 and a transfer function module that transfers backup data to the NAS device 4. The network usage is an amount determined by, for example, what percentage of the transferable bandwidth of the network is used or how many lines are used when the number of lines in the network is determined.

  The NAS device 4 includes a data storage unit 6 that can be accessed from the information terminal device 1, and a backup reception program 5 that receives data transfer reservation and data transfer from the backup program 2. The backup reception program 5 has a function of predicting the future load state and network usage of the NAS device 4 from the task currently being executed by the NAS device 4 and the task scheduled to be executed in the future, and by communicating with the backup program 2 The data transfer reservation is accepted from the timing at which the data transfer ends at the earliest and the load on both the information terminal device 1 and the NAS device 4 is the lowest.

  FIG. 2 shows a processing sequence performed when data is created by the backup program 2 shown in FIG. This figure shows a processing sequence from user data creation in the information terminal device 1 to data backup to the NAS device 4 by the backup program 2. This sequence will be described below.

(1) A user creates data.
(2) The data creation / monitoring function module of the backup program 2 detects the user's data creation and notifies the list management function module that manages the list of data to be backed up to add the data to be backed up.
(3) The list management function module adds the data to the list of data to be transferred, and notifies the transfer amount estimation function module that estimates the data transfer amount that the data list has been changed.

(4) The transfer amount estimation function module calculates the data transfer amount from the data list to be transferred, and passes the data list and transfer amount to the transfer reservation function module.
(5) The transfer reservation function module predicts the future load state and network usage of the information terminal device 1 from the estimated transfer amount, the current task on the information terminal device 1, and the task scheduled to be executed in the future. The result is communicated with the backup acceptance program 5 of the NAS device 4.

(6) The backup acceptance program 5 predicts the future load state and network usage of the NAS device 4 from the current task on the NAS device 4 and the task scheduled to be executed in the future, and the information terminal device 1 and the NAS device 4 Both loads are the lowest, and the timing for ending the data transfer is determined earliest and the transfer is reserved.
(7) When the transfer reservation time comes, the transfer function module is called from the transfer reservation function module, and data transfer from the information terminal device 1 to the NAS device 4 is performed.

(8) When the data transfer is completed, a transfer completion notification is sent to the list management function module, and the list management function module deletes the fact that the data is to be transferred from the list of data to be transferred. The transferred data itself may be deleted or left in the information terminal device 1.

  A specific embodiment capable of such a backup operation will be described here. In the above sequence (5), the task scheduled to be executed in the future of the information terminal device 1 executed by the transfer reservation function module is predicted when the task is a future input operation to the information terminal device 1 of the user. For example, when the information processing device 1 is a device that records a predetermined program such as a television program, if the user makes a recording reservation for the program, the information terminal device 1 will execute in the future. It is possible to predict and operate a scheduled task.

  Therefore, an embodiment in which recording data is automatically transferred to the NAS apparatus 4 and aggregated based on the configuration shown in FIG. 1 will be described with reference to FIG. In this embodiment, the information processing apparatus 1 shown in FIG. 1 is shown as a first recording / storage apparatus 1A to an Nth recording / storage apparatus 1N. In this embodiment, the data recorded in each recording storage device 1A to 1N is efficiently transferred to the NAS device 4 and stored without affecting the recording task of each recording storage device 1A to 1N. It is.

  As shown in FIG. 3A, the data transfer device of this embodiment is an automatic recording data aggregation system, and the network 3 includes a plurality of recording storage devices 1A to 1N and a NAS device that provides a data storage function. 4 are connected to each other so that data can be transferred to each other. The network 3 is a LAN, the Internet, or a dedicated communication line as in the above-described embodiment, and data is transferred between the recording / storage devices 1A to 1N and the NAS device 4 regardless of wired or wireless. To do. Another information terminal device 7 is connected to the NAS device 4, and the NAS device 4 may perform other tasks other than recording data recording.

  The recording storage devices 1A to 1N are television broadcast recording devices having storage devices such as HDDs (hard disk devices), for example, and are provided with an antenna input and a tuner (not shown). The recording storage devices 1A to 1N each have a data transfer device 2A provided with a data transfer program for transmitting and receiving data, and access the NAS device 4 through the network 3 to transfer recorded data.

  The NAS device 4 is a server that stores and distributes multimedia data, for example, and includes a data storage unit 6A that can be accessed from the recording storage devices 1A to 1N, and a data transfer device (data transfer program) of the recording storage devices 1A to 1N. ) A data transfer acceptance program 5A for accepting data transfer reservation and data transfer from 2A is provided.

  The data transfer program 2A includes a recording management function module for calculating a recording completion time and a recording time and a recording data capacity (calculated by the recording time and a recording mode) from recording reservation information by an EPG (electronic program guide) and the like. A list management function module that manages a list of recorded data, a transfer amount estimation function module that estimates a transfer amount from a list of recorded data to be transferred, and transfer of recorded data from the estimated transfer amount and recording reservation information on a recording storage device The transfer reservation function module determines the timing by communication with the NAS device 4, and the transfer function module transfers the recorded data to the NAS device 4.

  The data transfer acceptance program 5A has a function of predicting the future load state and network usage of the NAS device 4 from the task currently being executed by the NAS device 4 and the task scheduled to be executed in the future, and is capable of communicating with the data transfer program 2A. Thus, the recording / storage apparatus 1 is not recording, the NAS apparatus 4 has the lowest load, and the data transfer reservation is accepted from the timing when the data transfer is completed earliest. Further, it has a function of communicating from the data transfer acceptance program 5A to the data transfer program 2 and changing the reservation for data transfer. For example, when another task other than recording data recording performed by the NAS device 4 is changed for another information terminal device 7 connected to the NAS device 4, the reservation for data transfer is also changed.

  FIG. 4A shows an example of a recording list in the certain recording storage device 1 shown in FIG. In the recording list, for example, list name, recording date, recording reservation time, recording channel, data indicating whether or not the data is to be transferred, recording mode, and transfer amount (MB) are described. The recording mode is shown as XP for the high quality mode, SP for the standard mode, LP for the long time mode, and EP for the long time mode. The transfer amount is the size of the data file. When a TV program is recorded for 1 hour, for example, it stores 4,550 MB in the high image quality mode XP, 2,240 MB in the standard mode SP, and 1,130 MB in the long time mode LP. The capacity is shown as required.

  FIG. 4B shows the scheduled recording time described in the recording list of FIG. 4A together with the scheduled recording date. In this embodiment, when the recording storage device 1 is performing recording, the already recorded data is not transferred to the NAS device. Note that when the television program recorded in the recording storage device 1 is transferred to the NAS device 4 through the network 3, the transfer time can be much shorter than the recording time. For example, data with a recording time of 1 hour in the long-time mode LP can be transferred from the recording storage device 1 to the NAS device 4 in approximately 1/10 time (about 6 minutes). Even in the same hour, when the recording mode is the standard mode SP, the transfer time is doubled.

  FIG. 5 is an operation diagram showing the operation of the NAS device 4 shown in FIG. Since the data transfer rate is faster than the recording time, the NAS device 4 can store data of a plurality of recording storage devices 1 within the same time. FIG. 5 shows, as an example, the data storage operation of the NAS device 4 from 10 pm to 11 pm on the dates (March 13 to March 16) shown in FIGS. Some are shown. In this figure, a portion indicated by a thick frame indicates a storing operation of a program recorded by the recording / storage apparatus 1 shown in FIG. 4B (this is indicated as PC1 as the first recording / storage apparatus). PC2 to PC9 indicate data storage processing of the other recording / storage device 1.

  As described above, the NAS device 4 predicts the future load state and network usage amount of the task scheduled to be executed in the future based on the data from the data transfer program 2A of the plurality of recording storage devices 1 input to the data transfer acceptance program 5A. Thus, the recording storage device 1 is not recording, the load on the NAS device 4 is the lowest, the timing for ending the data transfer is determined earliest, the data transfer reservation is accepted, the data storage plan is made, and the data is efficiently stored Remember.

  By the way, once a reservation is completed, the reservation may be changed, for example, added. An example of the transfer change when the reservation is added at the scheduled transfer time of the recorded data will be described here. FIG. 6 illustrates a change in data transfer when another recording reservation (recording 2) is entered during the scheduled transfer time of recording data (recording 1 in the figure) in a predetermined recording storage device 1. is there.

  In such a case, priority is given to the operation of recording 2, the data of recording 1 that was scheduled to be transferred during the time of recording 2 is divided, and a part of the data of recording 1 is transferred before the start of recording 2, When the recording 2 is completed, the remaining portion of the recording data of the recording 1 is transferred. Needless to say, the data division of the recording 1 is changed according to the recording operation on the recording storage device 1 side.

  FIG. 7 is a diagram showing an example of changing the timing of data transfer when a recording reservation is added in the data transfer apparatus shown in FIG. The upper side of FIG. 7 shows recording reservations in the three recording storage devices PC1, PC2, and PC3, and transfer reservation timings for transferring the respective recording data to the NAS device 4. There is no overlap in the transfer timing for transferring the respective recorded data to the NAS device 4.

  An example of how the recording data transfer timing is changed when a recording reservation is added to the recording storage device PC2 in this situation is shown in the lower part of FIG. In the recording reservation added to the recording storage device PC2, it is assumed that the recording start time is later than the recording start time of the recording reservation of the recording storage device PC1, and the recording end time is the same as the recording end time of the recording storage device PC1. For example, it is assumed that the priority order of transfer of recording data reserved for recording in the recording storage device PC2 is higher than the priority order of transfer of recording data reserved for recording in the recording storage device PC1. In this case, the recording data transfer of the recording storage device PC2 is immediately executed, and the recording data transfer of the recording storage device PC1 is delayed.

  Next, an example will be described in which the data transfer device adjusts the transfer rate during data transfer from the information terminal device. For example, when a user starts stream reception of video, music, etc. using the network on the information terminal device side, if a certain network bandwidth guarantee is required, the data transfer speed is limited, and stream reception You can prevent falling over. In addition, when the user starts downloading from the Internet on the information terminal device side, the backup data transfer rate can be limited so that the download rate is not affected.

  Furthermore, an embodiment will be described in which the data transfer device changes whether or not transfer data is compressed during data transfer in order to change the load state and the network usage. As shown in FIG. 8, with respect to a file 8 in which data compression is effective, such as a text file or office document, if the data is compressed and transferred on the information terminal device 1 (described as PC in the figure) side. By expanding on the NAS device 4 side at the time of reception, the transfer time can be greatly shortened. However, in compression transfer, the CPU load increases on both the information terminal device 1 side and the NAS device 4 side as compared with the case of non-compression, so the compression process is invalidated when recording or other transfer processing is performed. be able to.

  The processing sequence described with reference to FIG. 2 in the present invention can be stored in a medium in the form of a program and supplied to the data transfer apparatuses 2 and 2A.

  The present invention has been described in detail with particular reference to preferred embodiments thereof. For easy understanding of the present invention, specific embodiments of the present invention will be described below.

(Supplementary note 1) Data stored in the information terminal device is stored in each of the plurality of information terminal devices connected to the network and stored in the network-connected storage device that stores data input through the network. A data transfer device that performs transfer processing,
Means for estimating a network usage amount required for data transfer of data to be transferred from a list of data to be transferred in the information terminal device;
Means for predicting a future load state of the information terminal device and a network usage amount from a task currently executed by the information terminal device and a task scheduled to be executed in the future;
Means for predicting the future load state and network usage of the storage device from the task currently being executed by the storage device and the task scheduled to be executed in the future;
Means for making a data transfer plan between each of the information terminal devices and the storage device according to the predicted network usage amount and a task scheduled to be executed in the future by the information terminal device and the storage device. A data transfer device.
(Supplementary note 2) Further, the information terminal device has means for monitoring creation / update of data to be transferred, and automatically creates a list of data to be transferred. The data transfer device according to appendix 1.
(Additional remark 3) The said data transfer apparatus is provided with a means to adjust the transfer rate at the time of data transfer, The data transfer apparatus of Additional remark 1 or 2 characterized by the above-mentioned.
(Additional remark 4) The said data transfer apparatus is provided with the means which divides | segments the transfer amount at the time of the predetermined amount of data transfer, and transfers the said predetermined amount of data over multiple times. Data transfer device.
(Supplementary Note 5) The data according to Supplementary Note 1 or 2, wherein the data transfer device includes means for changing presence / absence of compression of transfer data during data transfer in order to change a load state and a network usage amount. Transfer device.
(Supplementary note 6) The data transfer system according to Supplementary note 1 or 2, wherein the data transfer device includes means capable of changing a priority of a transfer order at the time of data transfer according to a type of data.
(Supplementary note 7) The data transfer device includes means for reestablishing a data transfer plan between each of the information terminal devices and the storage device when a list of data on the information terminal device is changed. The data transfer device according to any one of appendices 1 to 6.
(Supplementary Note 8) The data transfer device is configured to reestablish a data transfer plan between each of the information terminal devices and the storage device when a task currently being executed on the information terminal device and a task scheduled to be executed in the future are changed. The data transfer device according to any one of appendices 1 to 6, further comprising:
(Supplementary Note 9) The data transfer device includes means for reestablishing a data transfer plan between each of the information terminal devices and the storage device when a task currently being executed and a task scheduled to be executed in the future on the storage device is changed. The data transfer device according to any one of appendices 1 to 6, characterized in that:
(Supplementary Note 10) The data transfer device adds data scheduled to be created and updated in the future by a task currently being executed and scheduled to be executed in the future on the information terminal device as a data transfer target in advance. The data transfer according to any one of appendices 1 to 6, further comprising means for making a data transfer plan between each of the information terminal devices and the storage device so that the data is transferred after creation and update apparatus.
(Supplementary Note 11) A network data transfer method in which a plurality of information terminal devices and a network-connected storage device are connected to a network, and the storage device can store data transferred from each of the information terminal devices. There,
From the list of data subject to data transfer in the information terminal device, estimate the network usage required for data transfer of the data to be transferred,
From the task currently executed by the information terminal device and the task scheduled to be executed in the future, the future load state of the information terminal device and the network usage amount are predicted,
From the task currently executed by the storage device and the task scheduled to be executed in the future, the future load state and network usage of the storage device are predicted,
Data transfer characterized in that a data transfer plan is established between each of the information terminal devices and the storage device according to the predicted network usage and tasks scheduled to be executed in the future by the information terminal device and the storage device. Method.
(Supplementary Note 12) In a network in which a plurality of information terminal devices and a network-connected storage device are connected to a network, and the storage device can store data transferred from each of the information terminal devices, the information terminal device From the list of data subject to data transfer in the program for estimating the network usage required for data transfer of the data to be transferred, the task currently executed by the information terminal device, and the task scheduled to be executed in the future, The future load state of the storage device and the network use from the program that predicts the future load state and network usage of the information terminal device, the task that the storage device is currently executing, and the task that is scheduled to be executed in the future A program for predicting the amount, and the predicted network And a storage medium storing a program for making a data transfer plan between each of the information terminal devices and the storage device according to a task scheduled to be executed in the future by the information terminal device and the storage device.

(A) is a block diagram which shows the whole structure of the system containing the data transfer apparatus of this invention which performs the backup process of data, (b) is a block diagram which shows the function of the backup program of (a). It is a sequence diagram which shows the process sequence which the backup program shown in FIG.1 (b) performs at the time of data creation. (A) is a block diagram which shows the whole structure of the system containing the data transfer apparatus of this invention when an information terminal device is a video recording storage apparatus, (b) is a block diagram which shows the function of the data transfer program of (a) It is. (A) is a figure which shows an example of the video recording list in the video recording storage apparatus shown to Fig.3 (a), (b) is a figure which shows the video recording reservation time described in the list of (a) with the video recording reservation date. It is an operation | movement diagram which shows operation | movement of the storage apparatus in the data transfer apparatus of this invention shown to Fig.3 (a). It is a figure explaining the division | segmentation of data transfer when another recording reservation has been input in the transfer time of recording data in a predetermined information terminal device. FIG. 4 is a diagram showing an example of changing the timing of data transfer when a recording reservation is added in the data transfer apparatus shown in FIG. It is a figure explaining the compression transfer of the data in the data transfer apparatus of this invention.

Explanation of symbols

1, 1a to 1n Information terminal device 1A to 1C Recording and storage device 2 Data transfer device (backup program)
2A data transfer device (data transfer program)
3 Network 4 Network connection type storage device (NAS device)
5 Backup acceptance program 5A Data transfer acceptance program 6 Data storage

Claims (5)

Transfers data stored in the information terminal device to a network-connected storage device that is built in each of a plurality of information terminal devices connected to the network and stores data input through the network. A data transfer device,
Means for estimating a network usage amount required for data transfer of data to be transferred from a list of data to be transferred in the information terminal device;
Means for predicting a future load state of the information terminal device and a network usage amount from a task currently executed by the information terminal device and a task scheduled to be executed in the future;
Means for predicting the future load state and network usage of the storage device from the task currently being executed by the storage device and the task scheduled to be executed in the future;
Means for making a data transfer plan between each of the information terminal devices and the storage device according to the predicted network usage amount and a task scheduled to be executed in the future by the information terminal device and the storage device. A data transfer device.   The information terminal device further comprises means for monitoring creation / update of data to be transferred, and a list of data to be transferred is automatically created. The data transfer device described in 1.   3. The data transfer device according to claim 1, further comprising means for dividing the transfer amount and transferring the predetermined amount of data a plurality of times when transferring the predetermined amount of data. .   The data transfer device is configured to change a list of data on the information terminal device, change a task currently being executed on the information terminal device or a task scheduled to be executed in the future, and a current execution on the storage device. 4. A means for reestablishing a data transfer plan between each of the information terminal devices and the storage device in any case when a task scheduled to be executed in the middle or in the future is changed. The data transfer device according to any one of the above. A data transfer method in a network in which a plurality of information terminal devices and a network-connected storage device are connected to a network, and the storage device can store data transferred from each of the information terminal devices,
From the list of data subject to data transfer in the information terminal device, estimate the network usage required for data transfer of the data to be transferred,
From the task currently executed by the information terminal device and the task scheduled to be executed in the future, the future load state of the information terminal device and the network usage amount are predicted,
From the task currently executed by the storage device and the task scheduled to be executed in the future, the future load state and network usage of the storage device are predicted,
Data transfer characterized in that a data transfer plan is established between each of the information terminal devices and the storage device according to the predicted network usage and tasks scheduled to be executed in the future by the information terminal device and the storage device. Method.

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