JPS6263348A - Remote file copying system - Google Patents

Abstract

PURPOSE:To reduce remarkably the communication quantity as compared with conventional systems which transmit file data through a communication channel, by copying file data in a storage device by only transmitting a copying command through a communication channel. CONSTITUTION:A user system 3 calculates the data address of the file of a transferring side and data address 001 of the file of a transferred side by means of a file managing means 32. Then the system 3 transmits a copying command 002 having the data address 001 as a parameter to a communication channel 4 by means of a copying command transmitting means 31 and the channel 4 transmits the command 002 to a server system 2. The server system 2 obtains the data address of the transferring side file and data address 001 of the transferred side file, both of which are parameters. Thereafter, the server system 2 causes a data copying means 22 to copy data in a storage device 1 to another position in accordance with the data addresses of the transferring side file is copied to a part of the transferred side file.

Description

TECHNICAL FIELD The present invention relates to a remote file copying method, and more particularly to a remote file copying method having a file management means on the user system side in a remote file system.

Prior Art Conventionally, when copying remote files in a remote file system that has file management means on the user system side, the following procedure was used as an extension of the case where the user system directly accessed the storage device. . That is, first, the user system specifies the data address of the transfer source file calculated by the file management means and sends a read command to the server system. This gives the user system a portion of the (usually fixed length) file data. Next, the user system specifies the data address of the destination file calculated by the file management means and gives a write command to the server system,
Send part of the file data that was read earlier. below,
File data is copied by repeatedly giving read commands and write commands to the server system until the source file is exhausted.

As mentioned above, in the conventional remote file copy method, all the file data to be copied must go back and forth on the communication path once, and when the file data pile is large, the increase in communication volume causes problems. This resulted in an increase in processing time. In addition, by occupying resources related to a communication channel for a long time, the serviceability of other communications using the same communication channel may deteriorate, and due to an increase in the amount of data processing by the user system, storage space and CPU occupancy time may be reduced. This also included the problem of an increase in required system resources.

An object of the present invention is to eliminate the above-mentioned problems and reduce the processing time required to perform file copying by reducing the occupancy time of one communication channel.

An object of the present invention is to provide a remote file copying method that can reduce required system resources.

The remote file copy method according to the present invention has a file management means on the user system side, and copies data in a data file based on instructions from the file management means. In one type, the user system sends a copy command including the data address of the transfer source file and the data address of the transfer destination file, making it possible to copy the data file without sending or receiving copy data. It is a feature.

15M Next, the present invention will be explained with reference to the drawings.

Referring to the block diagram of an embodiment of the present invention shown in FIG. 1, one embodiment of the present invention includes a storage device 1. Server system 2. It is a remote file system composed of a user system 39 and a communication path 4, and the server system 2 includes a copy command receiving means 21 and a data copying means 2.
2, the user system 3 has a copy command issuing means 31
and file management means 32.

Although only one user system is depicted in the figure to avoid complication of the drawing, there may be a plurality of user systems that use the server system. In this case, there may be as many communication paths connecting each user system and the server system as there are user systems, or the communication path may be shared by multiple users.

In the figure, when the user system 3 copies a file in the storage device 1, the operation is as follows. First, the user system 3 uses the file management means 32 to calculate the data address of the transfer source file and the data address 001 of the transfer large file. Next, user system 3
The copy command transmitting means 31 transmits to the communication path 4 a copy command 002 having the data address of the transfer source file and the data address 001 of the transfer destination file as parameters. The communication path 4 transmits the copy command 002 sent from the user system 2 to the server system 2.

The server system 2 receives the copy command 002 by the copy command receiving means 21, and obtains the data address of the transfer source file and the data address 001 of the transfer destination file, which are parameters. Next, the server system 2 uses the data copying means 22 to copy the data in the storage device 1 to another location based on the data address of the source file and the data address 001 of the destination file. By the above operation, part of the data (usually fixed length) of the source file is transferred.
is copied to part of the destination file.

By repeating the above operations for all data in the source file, the data in the source file will be copied to the destination file and the copying will be completed.

In the above embodiment, the user system 3 may be a personal computer, and the communication path 4 may be an area network.

As described in detail, in the remote file copy method according to the present invention, file data in a storage device is copied by transmitting a copy command through a communication path. Therefore, compared to the conventional method of transmitting file data through a communication channel, the amount of communication can be significantly reduced, reducing the processing time for file copying. 8. Improving the serviceability of the communication channel by reducing the time occupied by the communication channel. Furthermore, it has a great effect on reducing the system resources required by the user system.

[Brief explanation of drawings]

The figure is a block diagram of an embodiment of the invention. Explanation of symbols of main parts 1... Storage device 2... Server system 3...User system

Claims (1)

[Claims] A remote file copy method in which a file management means is provided on the user system side, and data in a data file is copied based on instructions from the file management means, and the data of the source file is copied from the user system side. A remote file copy method characterized in that a copy command including an address and a data address of a transfer destination file is sent, thereby making it possible to copy a data file without sending or receiving copy data.