JP3290271B2 - Local area network - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a local area network (LAN) in which a plurality of workstations and a server are connected via a network.

[0002]

2. Description of the Related Art In recent years, a plurality of workstations (CP
U and a server (also C)
And a local area network (LAN) for exchanging various data between each workstation and the server, which is widely used. There was something like that.

(1) A plurality of data processing stations and a shared data processing station shared by each data processing station are connected to a LAN, and each data processing station is operable from the shared data processing station. Receiving a status signal indicating the operation of the shared data processing station when the status signal does not indicate an operable state, thereby preventing access to the shared data processing station from each data processing station. A data processing network having a shared station for eliminating useless communication (for example, see Japanese Patent Application Laid-Open No. Sho 64-42753).

(2) A plurality of networks (LANs) are connected to each other so that they can access each other, and when access is made across a plurality of networks, for example, information such as files existing from one network on another network When reading or writing
Caching for temporarily storing the information in an appropriate storage means is performed, and for the second and subsequent accesses, the storage means is directly accessed and read / written without passing through a distant network, so that the network can be accessed. A network system capable of improving response and reducing traffic (for example, Japanese Patent Application Laid-Open No. 3-26
No. 3940).

[0005]

However, in any of the above-mentioned conventional networks, for example, data transfer for writing or reading a file having a large data amount between each workstation and a server,
When performing access such as data backup from each workstation to the server, when a wait time until the end of the access occurs for the user on the workstation side according to the state of the server, the user knows the wait time until the end of the access. There was a problem that it was not possible.

[0006] Further, when the user on the workstation side feels that the access end is later than usual when accessing the server, if the user starts the utility program and does not refer to the state of the LAN or the server, the user is required to start the utility program. There was also a problem that it took time and trouble to find out the cause of the delay.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an object of the present invention to enable a user on a workstation to know an estimated access end time when accessing a server. And It is another object of the present invention to be able to know the cause when the access end is later than usual.

[0008]

According to the present invention, in order to achieve the above object, in a local area network in which a plurality of workstations and a server are connected via a network, the server is connected to the server according to the state of the server.
Disk write or read data per fixed time
An information table describing the amount is provided, and the
The above information table is displayed at regular intervals during access by the
Refer to the status of the server corresponding to the current
Disk write / read data amount per fixed time
If described, the amount of data and the workstation
Access end depending on the total amount of data to be transferred to
Means for determining the scheduled
Notify the workstation of the expected access end time
Means are provided for each of the workstations.
To display the estimated access end time notified by the server
A step is provided.

Also, a plurality of workstations and servers
And a local area network connected to
In the network, the server
Disk write or read data per fixed time
An information table that describes the amount of data
Information table at regular intervals during
Table and refer to the status corresponding to the current server status.
Disk write or read data per fixed time
If there is a description of the amount of data,
Depending on the total amount of data to be transferred
The means for determining the expected access end time and the means
The estimated access end time obtained from
Means for notifying the above workstations
For notifying the total amount of data to be transferred to the server
And the expected access end time notified from the server
Display means may be provided.

Further, the local area network as described above is used.
In the network, the server
The above information table is displayed every time an access occurs between
The directory per fixed time according to the server status at that time
Add or update the disk write or read data amount.
Such means may be provided.

[0011] In addition, the local area, such as described above
In a network, the server
When notifying the application of the expected access end time, the current
Means for notifying the status of the server may be provided .

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a diagram showing the overall configuration of a first local area network which is the basis of the present invention.
In this local area network (abbreviated as “LAN”), a plurality of workstations WS1 to WSn and a server 1 are connected via a network 2.

Each of the workstations WS1 to WSn includes:
It is possible to transmit data to the server 1 via the network 2 by performing operations such as backup and copying of file data, and to receive data by reading file data from the server 1. Also, various data can be transmitted and received between the workstations WS1 to WSn via the network 2.

Each of the workstations WS1 to WSn has:
A terminal device such as a personal computer having a CPU, a ROM, a RAM, and the like;
1, WS2 and WS3 are the main body 20 and the display unit 2 respectively.
3, the storage unit 24, the main body 30, the display unit 33, the main unit 40, the display unit 43, and the storage unit 44. The workstation WSn includes the main unit 50 and the display unit 53.

Further, although not shown, a printing unit such as a laser printer or a facsimile may be connected to each of the workstations WS1 to WSn.

The main bodies 20, 30, 40, and 50 of the workstations WS1 to WSn are provided with workstation (WS) controllers 21, 31, 41, and 51, respectively. Means for measuring the amount of data transfer between the server 1 and the server 1 at regular time intervals during the access to the server 1; and the data transfer amount measured at regular time intervals during the access to the server 1 and the transfer amount. The respective functions also serve as a means for obtaining an estimated access end time based on the total data amount and a means for displaying the obtained access end time.

Each of the workstations WS1 to WS1
n is a workstation (WS) local area network (LAN) interface (I / F), respectively.
22, 32, 42, and 52, which control communication protocol control functions for transmitting and receiving data to and from the server 1 via the network 2.

The display units 23, 33, 43, and 53 of the workstations WS1 to WSn are display devices such as a CRT and an LCD. Various work screens and messages are displayed. The storage units 24 and 44 are memories of a hard disk device, a floppy disk device, an optical disk device, and the like, and store and store various data in the workstations WS1 and WS3.

On the other hand, the server 1 also has a CPU, a ROM, and a RAM.
It is a kind of computer provided with the above and the like, and includes a main body 10, a display unit 13, and a storage unit 14. The main body 10 includes a server control unit 11 and a server-local area network (L).
An AN) interface (I / F) 12 is provided. The server control unit 11 controls the entire control function of the server 1. The server-LAN I / F 12 is connected to the workstations WS1 to WSn via the network 2. Controls the function of controlling communication protocols between

The display unit 13 is a display device such as a CRT or an LCD, and each of the workstations WS1 to WSn.
It displays the processing status when data is transmitted and received between them, various work screens, various messages, and the like. The storage unit 14 includes a hard disk device, a floppy disk device,
Backup data transmitted from each of the workstations WS1 to WSn,
Various data such as copy data is stored and stored.

Next, a description will be given of a process performed when data is transferred between the workstation WS1 and the server 1 in the first LAN. First, a process for transferring data from the workstation WS1 to the server 1 will be described. When a virtual circuit is established between the workstation WS1 and the server 1, the workstation WS1 holds the total data amount of the file to be transferred, and starts accessing the server 1 for data transfer.

When the workstation WS1 starts data transfer of a file to be transferred to the server 1, the workstation WS1 measures time, and measures the data transfer amount to the server 1 when the measured time has passed a predetermined time. A scheduled data transfer (access) end time is obtained based on the measured data transfer amount and the total data amount, and the access end scheduled time is displayed on the display unit 23. This process is repeated until the data transfer ends. On the other hand, the server 1 stores the data transferred from the workstation WS1, for example, in the storage unit 14.

Next, from the server 1 to the workstation W
Processing for transferring data to S1 will be described.
When a virtual circuit is established between the workstation WS1 and the server 1, the workstation WS1 indicates a file to be transferred to the server 1, and when the access for data transfer from the server 1 is started, the server 1 transmits the file from the workstation WS1. The data transfer of the file is started together with the total data amount of the specified file.

The workstation WS1 holds the total amount of data received from the server 1, measures the time, stores the transferred data in the storage unit 24, and the measured time elapses a predetermined time. Then, the data transfer amount received from the server 1 is measured, a scheduled data transfer (access) end time is obtained based on the measured data transfer amount and the total data amount, and the access end scheduled time is displayed on the display unit 23. This process is repeated until the data transfer ends.

Next, a process for backing up the file data held by the workstation WS1 to the server 1 in the first LAN will be described. FIG. 2 is a flowchart showing a backup process between the workstation WS1 and the server 1.

When backing up the file data stored in the storage unit 24 to the server 1, the workstation WS1 first uses the communication protocol of the currently connected and used network 2 as shown in the flowchart of FIG. A virtual line establishment request is transmitted to the server 1 to establish a virtual line with the server 1, and at the same time, the storage unit 14 of the server 1 is shared.

Thereafter, the workstation WS1 executes its own backup program, and starts the backup process of the file data stored in the storage unit 24 with respect to the server 1. The backup program that has received the backup processing start command calculates the total data amount of the backup target files (for example, all the files stored in the storage unit 24) of the storage unit 24 specified by the user, and Of the data to the server 1 via the network 2 is started.

On the other hand, in the server 1, the workstation W
The data transferred from S1 is sequentially stored in the storage unit 14 as backup data. Then, the workstation WS1 backup program measures the time during the transfer of the file data, and measures, for example, the amount of data transferred to the server 1 after 5 seconds have elapsed.

Then, the scheduled backup end time (corresponding to the estimated access end time) is calculated and obtained by dividing the total data amount already calculated and held by the data transfer amount measured during the five seconds. It is displayed on the display unit 23.

In this way, the workstation WS1 measures the data transfer amount every 5 seconds during the data transfer at the time of the backup, calculates the scheduled backup end time based on the data transfer amount and the total data amount, and calculates the time. Display 23
Is repeated, and when the data transfer is completed, the process is terminated.

When data is transferred from each of the workstations WS1 to WSn to the server 1 via the network 2, the traffic volume of the network 2 and the usage efficiency of the server 1 (for example, the server 1 performs the processing of the workstation WS3) And the disk access request from the workstation WS1 is kept waiting), the data transfer speed from each of the workstations WS1 to WSn to the server 1 often becomes inconsistent.

Thus, as described above, each of the workstations WS1 to WSn performs a process of calculating and displaying the scheduled access end time at regular intervals during access to the server 1, and provides the user with the status of the network 2. The scheduled end time of the backup that changes accordingly can be notified sequentially.

Thus, each of the workstations WS1 to WS1
When the WSn accesses the server 1 for data transfer, the expected end time of the access is obtained and displayed at regular intervals, so that the user can easily know the expected end time of the backup to the server 1. There is also a merit of realizing the function of the server 1 without any change.

Next, a process when the workstation WS1 reads data of a file backed up in the server 1 will be described. FIG. 3 is a flowchart showing a backup file reading process between the workstation WS1 and the server 1.

In this process, the workstation WS1
When the workstation WS1 establishes a virtual line with the server 1 via the network 2, the workstation WS1 executes its own backup data reading program, and starts reading the backup file data from the server 1.

The backup data reading program which has received the command to start reading the data of the backup file stores the files to be read specified by the user (for example, all the files stored in the storage unit 14 of the server 1) in the server. Notify 1.

On the other hand, the server 1 has a workstation WS
The data of the file notified from 1 is read from the storage unit 14, the total data amount is obtained and notified, and the data transfer of the file is started. This total data amount is calculated when the server 1 reads out the data from the storage unit 14. If the data is added to the file data in advance, it can be obtained without performing the calculation, and the measurement processing of the total data amount can be reduced.

The workstation WS1 holds the total data amount notified from the server 1, and sequentially stores the file transfer data in the storage unit 24. During the transfer, the transfer data amount is measured, for example, every 5 seconds, and the total data amount is divided by the measured data transfer amount, thereby completing the backup file reading end time (corresponding to the access end time). Is calculated, and the process of displaying it on the display unit 23 is repeated. When the data transfer from the server 1 is completed, this process is completed.

Thus, the workstation WS
When reading file data backed up in the server 1, the backup file reading completion time is displayed based on the total data amount of the file notified from the server 1 and the data transfer (reception) amount at regular intervals. To inform the user.

Therefore, in the first LAN described above, when each of the workstations WS1 to WSn accesses the server 1, each of the workstations WS1 to WSn obtains and displays the estimated access end time, so that each of the workstations WS1 to WSn is displayed. ... WSn can easily know the waiting time required for the access executed by the user.

Next, the second LAN on which the present invention is based
Will be described. The configuration of the second LAN is the same as that of the first LAN shown in FIG. 1 except that the functions of the workstations WS1 to WSn and the server 1 are different. The processing at the time of access between is different.

That is, in the second LAN , the server 1
At the time of access between the workstations WS1 to WSn, the expected end time of the access is obtained and notified to the workstations WS1 to WSn, which are displayed at the workstations WS1 to WSn.

In the case of the second LAN , the server control unit 11 of the server 1 controls the workstations WS1 to WSn
Means for measuring the amount of data transferred between the workstations at a certain time during the access by the user, the data transfer amount measured at a certain time during the access to each of the workstations WS1 to WSn, and the total data to be transferred. Means for obtaining the estimated access end time based on the amount or the total data amount notified from each of the workstations WS1 to WSn, and means for notifying the determined access end time to the accessing workstations WS1 to WSn. Fulfill.

Each of the workstations WS1 to WS1
The n WS control units 21, 31, 41, and 51 perform respective functions of a control unit that displays the estimated access end time notified from the server 1 and a unit that notifies the server 1 of the total amount of data to be transferred.

Next, a data transfer process between the workstation WS1 and the server 1 in the second LAN will be described. First, an access process for transferring file data from the workstation WS1 to the server 1 will be described. First, the workstation WS1
When a virtual circuit is established with the server 1, the server notifies the server 1 of the total data amount of the file to be transferred and starts access for data transfer.

The server 1 holds the total data amount of the file to be transferred notified from the workstation WS1, receives the transfer data of the file and stores it in the storage unit 14, and during the data transfer, the time is transferred. Measurement is performed, and when the measurement time passes a predetermined time, the data transfer amount from the workstation WS1 is measured.

Then, based on the measured data transfer amount and the total data amount, an expected data transfer (access) end time is obtained and notified to the accessing workstation WS1, and this process is terminated. Repeat until Meanwhile, the workstation WS
1 displays the scheduled access end time notified from the server 1 at regular intervals on the display unit 23, and ends this processing when the data transfer to the server 1 ends.

Next, from the server 1 to the workstation W
The processing at the time of access when transferring file data to S1 will be described. In this process, when the workstation WS1 establishes a virtual line with the server 1, the workstation WS1 notifies the server 1 of a file to be transferred,
Access for data transfer from the server 1 is started.

The server 1 reads the data of the file specified by the workstation WS1 from the storage unit 14, finds and holds the total data amount, and starts data transfer of the file. During the transfer, the time is measured. When the measured time exceeds a predetermined time, the data transfer amount transferred to the workstation WS1 is measured, and the access is performed based on the data transfer amount and the total data amount. The workstation WS1 for the scheduled end time
And the process is repeated until the data transfer is completed.

On the other hand, the workstation WS1 sequentially stores the data transferred from the server 1 in the storage unit 24,
The estimated access end time notified at regular intervals is displayed on the display unit 23, and when the data transfer from the server 1 is completed, this processing is ended.

Next, a process for backing up files held by the workstations WS1 and WS3 in the server 1 in the second LAN will be described. FIG. 4 shows each workstation WS1, WS
3 is a flowchart showing a backup process between the server 3 and the server 1;

When the workstation WS1 backs up the file data stored in the storage unit 24 and the workstation WS3 backs up the file data stored in the storage unit 44 to the server 1, the work station WS1 uses the flowchart of FIG. As shown in the figure, a virtual circuit establishment request is transmitted to the server 1 using the communication protocol of the network 2 currently used, respectively, to establish a virtual circuit with the server 1, and at the same time, the storage unit of the server 1 Share 14.

After that, the workstation WS1 executes its own backup program, and starts backup processing of the file data stored in the storage unit 24 with respect to the server 1. The backup program that has received the processing start instruction calculates the total data amount of the backup target file (for example, all files stored in the storage unit 24) specified by the user, and sends the total data amount to the server 1. Notice.

The workstation WS3 also executes the backup program to start the backup processing of the data of the file stored in the storage unit 44 for the server 1, and to execute the backup target file specified by the user (for example, the storage target file). The total data amount of all files stored in the section 44 is calculated, and the calculated
Notify to

On the other hand, the server 1
1 and WS3, and holds the total data amount of the backup file notified from each, and waits for the file data transfer from the workstations WS1 and WS3. As described above, the server 1 can simultaneously process requests (in this case, backup) from a plurality of workstations.

Next, the workstations WS1 and WS3
Starts transfer of the data of the file to be backed up to the server 1. The server 1 stores the transfer data from the workstations WS1 and WS3 as backup data in the storage unit 14, for example, the workstation W written to the storage unit 14 every 5 seconds.
The data transfer amount of each of S1 and WS3 is measured.

Then, for the workstation WS1, the total data amount notified by the measured data transfer amount is divided to obtain the workstation WS1.
1 to calculate and obtain the scheduled backup end time, and notify the workstation WS1 of it.

For the workstation WS3, by dividing the total data amount notified by the measured data transfer amount, the workstation WS3 is set.
The backup end time is calculated and obtained, and the calculated time is notified to the workstation WS3. Thus, the server 1 repeats this process until the data transfer from the workstations WS1 and WS3 is completed.

The workstations WS1 and WS3 display the scheduled backup end time notified from the server 1 every 5 seconds on the display units 23 and 43, respectively.
When the data transfer to is completed, the display process is terminated. In this way, the workstations WS1 and WS1
When backing up a file to the server 1, the server 3 can display the scheduled backup end time notified from the server 1 at regular intervals to notify the user.

Next, from the server 1 to the workstation W
The processing when S1 and WS3 read the data of the backup file will be described. FIG. 5 is a flowchart showing a backup file reading process between the workstations WS1 and WS3 and the server 1.

In this process, the workstation WS1
And WS3, when establishing a virtual circuit with server 1, respectively, executes their own backup data reading program and notifies server 1 of the backup file to be read, respectively.
The process of reading the backup file data from the server 1 is started.

On the other hand, the server 1 is connected to the workstation WS
1 and WS3 according to the request from the workstation WS1 from among the files stored in the storage unit 14.
Then, the backup files designated by WS3 and WS3 are read, and the data transfer of each file is started.

Then, for example, every 5 seconds, the amount of data transferred to the workstations WS1 and WS3 is measured, and the amount of data transferred to the workstations WS1 and WS3 is determined based on the data transfer amount and the total amount of data to be transferred. Obtain the expected end time of reading the backup file.

That is, with respect to the workstation WS1, the total data amount to be transferred is divided by the measured data transfer amount.
The expected end time of reading the backup file in S1 is calculated and obtained, and is notified to the workstation WS1.

For the workstation WS3, by dividing the total data amount to be transferred by the measured data transfer amount, the workstation WS3
3 to calculate and obtain the expected end time of reading the backup file, and notify the workstation WS3. Thus, the server 1 repeats this process until the data transfer to the workstations WS1 and WS3 is completed.

The workstations WS1 and WS3 store the data of the backup file transferred from the server 1 in the storage units 24 and 44, respectively, and display the scheduled backup file read end time notified every 5 seconds on the respective display units. 23 and 43, and when the transfer data from the server 1 ends, the display processing ends.

In this way, the workstation WS
When reading the backup file data backed up in the server 1, the server 1 and the WS 3 can display the scheduled backup file read end time notified from the server 1 at regular intervals to notify the user.

As described above, in the second LAN, when each of the workstations WS1 to WSn accesses the server 1, the scheduled access end time of each of the workstations WS1 to WSn being accessed on the server 1 side is determined. Since each of the workstations WS1 to WSn is notified, the processing for obtaining the scheduled access end time is reduced in each of the workstations WS1 to WSn. The waiting time for the executed access can be easily known.

Next, a LAN according to an embodiment of the present invention will be described. The configuration of this LAN is also the first L shown in FIG.
It is the same as the AN, and like the second LAN, the server 1 obtains the scheduled access end time during access between the workstations WS1 to WSn and notifies the respective workstations WS1 to WSn. The difference is that the information table is used when obtaining the estimated access end time.

In the case of the LAN of this embodiment, the storage unit 14 of the server 1 stores an information table describing the amount of data written to or read from the disk per fixed time according to the state of the server. During the access to each of the workstations WS1 to WSn, the amount of data written to or read from the disk per certain time corresponding to the state of the server during that time is described with reference to the information table at certain times. In this case, the function of the means for determining the scheduled access end time based on the data amount and the total data amount to be transferred between the accessing workstations WS1 to WSn is performed.

Next, the information table will be described. In this information table, various factors that delay the processing of the server 1 are registered, and the disk write or read data amount per fixed time according to the state of each factor (corresponding to “server state”) is described. . The various factors include:
For example, network traffic information (including elements such as the number of collisions and the number of retransmissions) of the server 1 at the time of access, CPU load, input-output (I /
O) Control (Printer access, RS232C access,
There are factors such as the number of disk requests).

The server 1 is connected to each workstation WS1
Each time an access occurs between .about.WSn, the state of each factor of the server 1 during the access and the amount of disk write or read data per fixed time corresponding to the state of the server are measured in this information table. , Describe it.

Table 1 is a table showing an example of the format of the information table. For example, the factors include collision and retransmission of network traffic information, CPU load factor, printer access for input-output (I / O) control, and RS232C. The access and the number of disk requests are registered.

Then, the state of the server 1 indicates that the collision of network traffic information is “0”, the retransmission is “0”, and C
PU load ratio “0 to 10%”, printer access “none” for input-output (I / O) control, and RS23
A write data amount “100” and a read data amount “−” (in this case, unmeasured) measured at the time of access when the 2C access is “none” and the number of disk requests is “0” are described.

The server 1 can add additional description of data to this information table or update the description. 1 of the information table shown in Table 1
In the case where the description content of the line is changed and updated, for example, as shown in Table 2
It becomes as shown in. That is, the description content on the first line is described as collision “1” of network traffic information and retransmission “0”, CPU load ratio “0 to 10%”, and printer access of input-output (I / O) control “none”.
, RS232C access “none” and disk request number “0”, the write data amount “7” at the time of access
0 ”.

In addition, when new data is added, Table 3
As shown in (1), data is newly added and described on the fifth to seventh lines. For example, in the fifth line, a collision “3” and retransmission “0” of the network traffic information, a CPU load ratio “10 to 20%”, and an input-output (I /
O) Write the amount of write data "65" and the amount of read (read) data "75" at the time of access in the state of control printer access "none", RS232C access "present", and number of disk requests "2". .

Further, in this information table, the disk write and read data amounts per fixed time which can be predicted in accordance with the state of each factor may be described in advance. Also in this case, the server 1 can add or update data each time an access occurs between the workstations WS1 to WSn.

[0086]

[Table 1]

[0087]

[Table 2]

[0088]

[Table 3]

Next, a description will be given of a process when data is transferred between the workstation WS1 and the server 1 in the LAN according to the embodiment of the present invention . First, a process for transferring data from the workstation WS2 to the server 1 will be described.

The server 1 is connected to each of the workstations WS1 to WS1.
Each time an access to WSn occurs, the information table is added or updated. And the workstation WS2
When a virtual line is established with the server 1, the server notifies the total data amount of the file to be transferred and starts access for data transfer.

On the other hand, the server 1
The total data amount notified from S2 is held, the data to be transferred is received and stored in the storage unit 14, and when the data transfer is started, the time is measured, and the measurement time is set to a predetermined fixed time. Is passed, the state of the server 1 at that time (state of each factor) is measured, and if there is a write data amount in a state applicable to the state, the information is read out, and the write data amount is read. A scheduled data transfer (access) end time is obtained based on the total data amount.

If there is no write data amount in the corresponding state, the current state of the server 1 and the write data amount in that state are measured, and the estimated access end time is calculated based on the write data amount and the total data amount. The state of the server (state of each factor) and the amount of data to be written are newly added to or changed by the information table, and the scheduled access end time is notified to the workstation WS1, and this processing is performed by data transfer. Repeat until done.

[0093] Then, the workstation WS2 displays the expected access end time notified from the server 1 at regular intervals on the display unit 33, and ends the display processing when the data transfer is completed. So the workstation
Side user is in server state when accessing the server
To know the expected access end time at certain time intervals according to
Can be.

Next, from the server 1 to the workstation W
A process for transferring data to S2 will be described.
In this process, when the workstation WS2 establishes a virtual line with the server 1, the workstation WS2 instructs a file to be transferred to the server 1, and starts access for data transfer from the server 1.

The server 1 reads the data of the file designated by the workstation WS2 from the storage unit 14, finds and holds the total data amount, starts data transfer of the file, and during the data transfer, The time is measured, and when the measured time elapses a predetermined time, the state of the server 1 at that time is measured.

If there is a read data amount in a state corresponding to the state with reference to the information table, a scheduled data transfer (access) end time is obtained based on the read data amount and the total data amount, and the access end is determined. The scheduled time is notified to the workstation WS1, and this process is repeated until the data transfer is completed.

On the other hand, the workstation WS2 receives the data transferred from the server 1, displays the expected access end time notified at regular intervals on the display unit 33, and when the data transfer from the server 1 is completed, the workstation WS2 receives the data. The display processing ends. Therefore, the workstation user
When accessing the server, constant according to the state of the server
It is possible to know the estimated access end time for each hour.

Next, a description will be given of a process for copying a file held by the workstation WS2 to the server 1 in the LAN according to the embodiment of the present invention .
FIG. 6 is a flowchart showing a copy process between the workstation WS2 and the server 1. In this process,
The server 1 updates the information table every time an access occurs between each of the workstations WS1 to WSn. I
As a result, the information in the server information table
Or add regulatory information.

For example, when the workstation WS2 wants to copy the data of the file being processed to the server 1,
A virtual circuit establishment request is transmitted to the server 1 using the communication protocol of the network 2 currently used to establish a virtual circuit with the server 1 and at the same time, the storage unit 14 of the server 1 is shared.

After that, the workstation WS2 executes its own copy program, and starts the process of copying the file data to the server 1. The copy program that has received the copy processing start command calculates the total data amount of the file to be copied specified by the user, notifies the server 1 of the total data amount, and starts data transfer of the copy file.

On the other hand, the server 1 is connected to the workstation WS
2, the file data to be transferred is stored in the storage unit 14 as a copy file, and the state of the server 1 is measured every 5 seconds, for example, and the information table is referred to. Then, if there is a write data amount in a state corresponding to the state, the expected copy end time is calculated and obtained by dividing the total data amount by the write data amount.

Further, the server 1 at that time is stored in the information table.
When there is no write data amount in the state corresponding to the state, the server 1 measures the state at that time, measures the write data amount of the file data in that state, and divides the total data amount by the write data amount. To obtain the expected copy end time.

Then, it is transferred to the workstation WS2.
And updates the information table so that the measured write data amount is added or changed in the information table in correspondence with the state of the server 1 at that time, and the file data copy process is continued. Then, when the copying of the file from the workstation WS2 is completed, this processing is completed.

On the other hand, the workstation WS2 displays the expected copy end time notified from the server 1 every 5 seconds on the display unit 33, and ends this processing when the transfer of the copy file data to the server 1 is completed. . In this manner, when copying a file to the server 1, the workstation WS2 can display the copy end scheduled time notified from the server 1 at regular intervals and notify the user. Therefore, the workstation user
Various changes in server status when accessing the server
Even if you do, the access ends at regular intervals according to the status.
You can know the expected time to complete.

Next, a process when the workstation WS2 reads the data of the file copied to the server 1 will be described. FIG. 7 shows a workstation W
9 is a flowchart illustrating a process of reading copy file data between S2 and the server 1.

In this process, the workstation WS2
When a virtual circuit is established with the server 1, the copy file data reading program executed by the user is executed, the copy file to be read specified by the user is notified to the server 1, and the copy file data from the server 1 is read. Start the reading process.

On the other hand, the server 1 is connected to the workstation WS
In response to the request 2, the data of the copy file notified by the workstation WS2 is read out of the files stored in the storage unit 14, the total data amount is obtained and held, and the file data transfer is started. .

During the data transfer, for example, the state of the server 1 is measured every 5 seconds, and if there is a read data amount in a state applicable to the state by referring to the information table, the read data amount is used. The expected end time of reading the copy file data of the workstation WS2 is obtained by dividing the total data amount, the expected end time of the read of the copy file data is notified to the workstation WS2, and the information table is updated.
This process is repeated until the data transfer to S2 ends.

The workstation WS2 receives and reads the copy file data transferred from the server 1, and displays on the display unit 33 the expected copy file data read end time notified from the server 1, for example, every 5 seconds. . Then, when the transfer data from the server 1 is completed, the process ends.

In this way, the workstation WS
When reading the file data copied to the server 1, the server 2 can display the copy file data reading end scheduled time notified from the server 1 at regular intervals and notify the user.

As described above, the LAN according to the embodiment of the present invention
In the server, an information table describing the amount of disk write or read data per fixed time according to the state of the server based on the factor that delays the processing is stored.

Therefore, based on the total data amount of the access target received from each workstation at the time of access to each workstation and the data amount of the state of the server at the time of the access described in the information table. Since the expected access end time is required, the processing load can be reduced, and the user can be notified of the estimated access end time even in the case of a short access that ends within a certain time.

When the information table is referred to when calculating the estimated access end time on the LAN in this embodiment , if there is no applicable write data amount or read data amount, the server described in the information table is not described. The prediction calculation may be performed using the write or read data amount corresponding to the state closest to the server state measured at that time from the state.

For example, if the state of the server is 60
%, If there is no data amount in that state in the information table, the write data amount is 1 when the CPU load factor is 70% and 50% as the state closest to the state of the server.
If it is described as 00 bytes and 200 bytes,
From these data amounts, a write data amount of 150 bytes at a CPU load rate of 60% is predicted and calculated.

Further, when the number of factors in the information table is too large to be predicted, priorities are assigned to the factors that affect data writing, and the factors are narrowed down based on the priorities to determine the estimated access end time. It may be.

Next, in the LAN according to the embodiment of the present invention, information indicating the state of the server 1 may be notified together with the estimated access end time. In this case, when notifying the scheduled access end time, the server control unit 11 of the server 1 also has a function of notifying the state of the server at that time.

FIG. 8 is a diagram showing an example of a data format used when notifying the state of the server together with the estimated access end time. This data stores "protocol header" and "expected access end time" data from the top. , The number of network information collisions and the number of network information retransmissions that are information indicating the state of the server after that
"CPU load factor""I / O controlled printer access"
Data such as “I / O control RS232C access” and “I / O control disk request count” are stored.

In the process of notifying the status of the server, the server 1 determines whether the amount of write or read data read from the information table together with the estimated access end time of the workstation WS2 obtained at regular intervals. The data is also notified to the workstation WS2.

For example, when the write data amount “70” in the first row shown in Table 1 is used, collision “1”, retransmission “0”, CPU load ratio “10-20%”, and printer access “none” , RS232C access “none”, and the number of disk requests “2” indicating the status of each factor to the workstation WS2.

When the workstation WS2 receives the data shown in FIG. 8, the workstation WS2 determines the expected access end time and the state of the server 1 (the state of each factor of the server) at the fixed time based on the data. Display unit 3
3 is displayed.

In this way, the server transmits the information indicating the current state of the server to each workstation together with the scheduled time for ending the data access, so that the workstation can receive the data.
The user on the application side is fixed when accessing the server
Hourly access end time
You can also know the status of the server. Therefore, each
In the workstation, the user terminates the access more than usual.
If the time between expirations is late, you can know the cause.
Wear.

[0122]

As has been described above, the local area network according to the present invention comprises a workstation
Side user has access to the server
You can know the estimated access end time.

[0123]

[0124]

[0125]

[0126]

[0127]

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a first local area network serving as a basis of the present invention.

2 is a flowchart illustrating a backup process between the first workstation WS1 and server 1 of FIG.

3 is a flowchart illustrating a backup file read processing between the first workstation WS1 and server 1 of FIG.

FIG. 4 shows a second local area network on which the present invention is based;
6 is a flowchart showing backup processing between network workstations WS1 and WS3 with server 1;

FIG. 5 shows a second local area network on which the present invention is based;
7 is a flowchart showing a backup file reading process between workstations WS1 and WS3 of the network between the workstations WS1 and WS3.

FIG. 6 shows a local area network according to an embodiment of the present invention;
10 is a flowchart showing a copy process between the workstation WS2 of the network and the server 1.

FIG. 7 shows a local area network according to an embodiment of the present invention;
11 is a flowchart showing a process of reading copy file data between the workstation WS2 of the network and the server 1.

FIG. 8 shows a local area network according to an embodiment of the present invention .
And the first and second local areas on which the present invention is based.
The rear network server 1 is connected to each workstation W
It is an example figure of the data format when notifying the status of the server together with the expected access end time to S1 to WSn.

[Explanation of symbols]

1: Server 2: Network 10: Server body 11: Server control unit 12: Server LAN interface (I / F) 13, 23, 33, 43, 53: Display unit 14, 24, 44: Storage unit 20, 30 , 40, 50: Main body of workstation 21, 31, 41, 51: WS control unit 22, 32, 42, 52: WS / LAN interface (I / F) WS1 to WSn: Workstation

Claims (4)

(57) [Claims] 1. In a local area network in which a plurality of workstations and a server are connected via a network, the server is connected to the server for a certain period of time according to the state of the server.
Information describing the amount of data written to or read from the disk
Provide a table and access by the workstation
The information table is referenced at regular intervals during the
Data per unit time for a state corresponding to the server state
If there is a description of the disk write or read data amount,
Transfer that amount of data between the workstation and
The expected access end time is calculated based on the total data volume to be
Means, and estimated access end time obtained by the means
And a means for notifying the workstation that the
A means for displaying a scheduled access end time . 2. In a local area network in which a plurality of workstations and a server are connected via a network, the server is provided with a plurality of workstations and a server for a certain period of time according to a state of the server.
Information describing the amount of data written to or read from the disk
It provided a table, by referring to the information table every predetermined time during access by the workstation currently
Data per unit time for a state corresponding to the server state
If there is a description of the disk write or read data amount,
Notified by the data amount and the workstation
Expected access end time depending on the total amount of data to be transferred
Means for determining, provided with means for notifying the access scheduled end time obtained by said means to said work station, said each workstation, to be transferred to the server
Means for notifying the total amount of data;
Means for displaying a scheduled access end time . 3. The local area network according to claim 1,
Network, the server has access to the workstation.
Each time an error occurs, the information table is stored in the information table at that time.
Disk writes on or read per a certain period of time in accordance with the state
A local area network comprising means for adding or updating the amount of overflow data . 4. The local area network according to claim 1 , wherein the server has access to the workstation.
Notify current server status when notifying scheduled time
A local area network comprising means .