JPH05274210A - Network file managing system - Google Patents

Abstract

PURPOSE:To improve the performance of access to a network file by decreasing the number of times for performing access to a network or the amount of transfer data when the file of a file server is shared in the network. CONSTITUTION:A caching client 9 is provided with a cache 12 for network file and means 10 to transfer the caching file to the other client, and a file server 1 is provided with file managing information 2 to record the condition of the shared file and file managing part 3 to transfer the file through a network OS 6 to the client of the request source and to instruct the transfer of the file to the caching client by controlling a disk device 5 of the own machine or controlling the client while referring to that information. Thus, the number of times for performing access to the network and the amount of transfer data can be decreased at the time of using the shared file.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer network system, and more particularly to a shared file management system in a network.

[0002]

2. Description of the Related Art Conventionally, in this type of network shared file management system, files are stored on a file server.

[0003]

Therefore, in the above-mentioned conventional management system, the shared file on the network is
Since it is placed on the file server, the number of times the file data moves between the server and the client increases, and there is a drawback that the file access performance from the client is reduced.

In view of the above problems, it is an object of the present invention to provide a network management system that reduces the number of times of accessing the network and the amount of transferred data and improves the performance of accessing a network file.

[0005]

According to the network address management system of the present invention, in a file server / client system, a disk device of its own machine is responsive to management information of a shared file and a file access request from the client. To transfer the file to the requesting client, and to direct the caching client to transfer the file to the requesting client if the file is currently cached by another client, and the current file. A file server having means for receiving a write request for a file being cached and returning a file from a client that is caching the file, and a network file access request on its own machine, the file is cached. It Determine the location of the access request and determine where to issue the access request, a method of caching and delay writing the shared file used by the device itself, and a method of transferring to another client according to an instruction from the file server. A method of notifying the result to the file server, a method of issuing a write request to the file server and transferring the file in the cache to the file server, and a means of notifying the file server of the update when the cached file is updated. , A client having a means for monitoring the frequency of access to the file being cached.

[0006]

According to the above configuration, when the client issues a network file access request on its own machine,
If it is not cached on its own machine, it issues an access request to the file server.

The file server receiving the access request is
If the management information of the shared file is currently cached by another client, the client is instructed to transfer the file to the requesting client, and the client caching the file If it does not exist, the file of the disk device of the own machine is transferred to the requesting client.

The requesting client, which has received the transfer of the access-requested file by the file server or the means for transferring from the caching client, performs the file access process by caching the target file by the writing means. If there is an update, it notifies the file server by means of notifying the update.

On the other hand, the client that has transferred the file that has been cached on its own machine to the other request source client from the file server and transferred the file by the transfer means notifies the file server of the transfer result. After that, or when the frequency of access to the file being cached on the local machine is monitored and there is no access for a certain period of time, a write request is issued to the file server and the file being cached is transferred to the file server.

Since the file server receiving the write request receives the file from the client by the means for receiving the file return, it is possible to reduce the number of times of access to the network and the amount of transferred data and improve the access performance to the network. it can.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a network file management system according to an embodiment of the present invention.

In FIG. 1, the file server 1 is composed of file management information 2, a file management unit 3, a disk device control unit 4, a disk device 5, a network OS 6 and a network control unit 7.

On the other hand, the client 9 is composed of a file control unit 10, a cache control unit 11, a cache 12, a network control unit 13, a network OS 14, a file access request control unit 15, and an upper application 16, and via a transmission medium 17. A file server 1, a client 9, and a client 8 having the same configuration as the client 9 are connected to each other at a request source of another access request.

Next, the operation will be described.

When an access request is issued from a client to a file shared on the network, the file access request control unit 15 of the client 9 confirms whether the client has already cached the file. If not, the network OS 14 is requested to access the file on the file server 1. The network OS 6 of the file server 1 transfers the data of the requested file from the disk device 5 to the file control unit 10 of the client 9. The file control unit 10 stores the file in the cache 12. The file management unit 3 of the file server 1 uses the file management information 2
It is recorded that the file is cached by the client 9.

After that, when another client 8 requests the file server 1 to access the same file, the file management section 3 refers to the file management information 2.
When it is confirmed that the requested file is cached on the client 9, the client 9 is instructed to transfer the file to the client 8.

The file control unit 10 of the client 9 is
When receiving a file transfer instruction from the file server 1,
The cached file is transferred to the client 8.

FIG. 2 is a flow chart of processing of the client / file server shown in FIG. Referring to FIG. 2, in the network file management method according to the embodiment, when a client side issues a request for access to a file shared on the network, the client 8 as a request source,
FIG. 10 is a diagram showing a flow of each processing in the file server 1 and the client 9 which is caching the requested file. Circles and Roman letters indicate corresponding processing.

First, when an access request to a network file is generated on the client 8 (step S-
1) It is determined whether the requested file is cached on the own machine (step S-2). If the file is being cached, the file being cached is accessed. If not, the network OS requests the file server 1 for access (step S-3).

When the file server 1 receives the request (step S-6), the data of the requested file is
It is confirmed whether the client other than the request source is not caching (step S-7). If not cached (step S-8), the file data of the disk device of the own machine is transferred to the requesting client 8 (step S-12), and the file management information 2 is updated (step S-13).

If the data is cached on another client 9 (step S-8), the client 9 is instructed to transfer the file data to the requesting client 8 (step S-9). ). The client 9 receiving the instruction (step S-14) transfers the data of the cached file to the requesting client 8 (step S-15) and determines whether the transfer is normally performed or failed. (Steps S-17 and S-18).

Upon receipt of the report from the client 9 (step S-10), the file server 1 updates the file management information 2 if normal, and waits for a request. If there is an abnormality or no report is returned within a certain period of time, it is determined that an abnormality has occurred in the caching client 9 (step S-11), and the file data of the disk 5 of the own machine is requested by the request source. To the client 8 (step S-12), and the file management information 2 is updated (step S-13).

The client 9 which has cached the file notifies the transfer result (steps S-17, S).
-18), the write request process for the file is performed to the file server 1 (step S-19), and the file is deleted from the cache 12 (step S-20).

Upon receipt of the file transfer, the requesting client 8 writes the file in the cache 12 of its own machine (step S-4) and performs a file access process (step S-5).

FIG. 3 is a flow chart of the update process between the client and the file server shown in FIG. It is the figure which showed the flow of each process in the client 8 and the file server 1 when the file access process is performed on the client of the network file management method of an Example. Circles and low letters indicate corresponding processing.

When the file is updated, the client 8 caches the file (step S-22) and writes the file in a delayed manner to notify the server 1 that the file has been updated (step S-22). Step S-2
3).

When the file server 1 is notified of the file update (step S-24), the file management information 2
Are updated (step S-25).

FIG. 4 is a flow chart of the write request process of the client shown in FIG. FIG. 9 is a diagram showing a flow of processing in the client 9 when a file being cached in the client 9 is no longer accessed in the network file management method of the embodiment.

The client 9 which is caching the file monitors the state of access to the file being cached (step S-26), and when there is no access to the file for a certain period of time (step S-2).
7) The cache write request is issued to the file server 1 (step S-28).

FIG. 5 is a flow chart of write request processing between the client and the file server in FIG. FIG. 9 is a diagram showing a flow of each processing in the client 9 and the file server 1 in the network file management method of the embodiment when the client requests the file server to write the file being cached. Circles and low letters indicate corresponding processing.

The client 9 which is caching the file makes a file write request to the file server 1 immediately after the file being cached is not accessed for a certain period of time or the file is transferred to another client 8 ( Step S-29).

When the file server 1 receives a write request from a client that is caching a file (step S-34), it checks whether the file has been updated from the state of being written in the disk device 5 of its own machine. Confirm (steps S-35 and S-36).
If it has been updated, a file data transfer instruction is issued (step S-38), and if it has not been updated, a transfer unnecessary notification is issued to the client (step S-37).

If there is a transfer instruction from the file server (step S-31), the client 9 transfers a copy of the file data to the file server 1 (step S-31).
-32). If an answer that does not require writing is received from the file server (step S-31), it is not transferred.

After transmitting the transfer instruction, the server 1 receives the file data from the client (step S-3).
9) and write to the disk device 5 (step S-
40), and updates the file management information 2 (step S-
41).

[0036]

As described above, according to the network address management method of the present invention, the number of accesses and the amount of transferred data are reduced by performing the transfer processing from the client that is caching to the requesting client. It has the effect of improving the access performance to the files shared by.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a network file management system according to an embodiment of the present invention.

FIG. 2 is a flow chart of processing between the client and the file server shown in FIG.

FIG. 3 is a flowchart of update processing between the client and the file server shown in FIG.

FIG. 4 is a flowchart of a write request process of the client shown in FIG.

5 is a flowchart of a write request process between the client and the file server shown in FIG.

[Explanation of symbols]

 1 file server 2 file management information 3 file management unit 4 disk device control unit 5 disk device 6 network OS 7 network control unit 8 client 9 client 10 file control unit 11 cache control unit 12 cache 13 network control unit 14 network OS 15 file access Request control unit 16 Upper application 17 Transmission medium

Claims (1)

[Claims] 1. In a file server / client system, management information of a shared file, and means for transferring a file of a disk device of its own machine to a requesting client in response to a file access request from the client, Means for instructing the caching client to transfer the file to the requesting client if the file is currently cached by another client; and caching from the client currently caching the file. In response to a request to write a file in the file server, and a file server having a means for receiving a return of the file, and a network file access request on its own machine, determine whether the file is cached,
A means for deciding where to issue an access request, a means for caching and delay writing a shared file used by the own device, a means for transferring to another client according to an instruction from the file server, a transfer result for the file Means for notifying a server, means for issuing a write request to the file server and transferring a file on the cache to the file server, and means for notifying the file server of the update when the cached file is updated A network file management method, comprising: a client having a means for monitoring the access frequency to the cached file.