JPH09321759A - Multi server system - Google Patents

Abstract

(57) [Abstract] [Problem] To efficiently use the capacity of the entire system according to the situation of each server. Servers 3a to 3c execute processing in response to processing requests from terminals 1a to 1g. The monitoring device 7 requests the operating status information from the servers 3a to 3c. Each of the servers 3a to 3c sends the load of its own device, the communication delay time for each terminal, the number of requests for each terminal, and the number of processing being executed as the operation status information. The monitoring device 7 displays the operating status of each server to the system administrator based on the collected information. When the system administrator recognizes that the load on a certain server is excessive, it specifies the terminal to be changed. The monitoring device 7 requests a change in the operation status when the connection destination of the designated terminal is changed to another server, and displays it to the system administrator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-server system having a plurality of servers.

[0002]

2. Description of the Related Art Conventionally, a multi-server system has been known in which a plurality of servers (devices which execute processing requested by terminals) are connected to a network. FIG.
Is a block diagram of a conventional multi-server system, 11a to 11e are terminals, and 12a and 12b are servers. In FIG. 4, description of the network connecting the terminals 11a to 11e and the servers 12a and 12b is omitted. As shown in FIG. 4, the terminals 11a to 11e always request the same server for processing until the connected server stops due to a failure or the like.

In such a multi-server system, when the processing load of a particular server increases, the terminals connected to the server with the excessive load will be irrespective of whether or not there is room in another server. On the other hand, the system administrator requests that the request for processing be refrained, and the terminal side is put into the restricted operation state. In addition, there is a system in which a monitoring device is provided to monitor the load of each server. In such a system, when the load increases, a notification is issued to the terminal so as to refrain from requesting processing to the server. Therefore, in any case, the system management is performed regardless of the status of the other server, so that when the other server has a margin, a large waste of resources occurs in the system as a whole.

[0004]

As described above, in the conventional multi-server system, the system cannot be operated according to the situation of each server, so that there is a problem that the capacity of the entire system cannot be used efficiently. It was The present invention has been made to solve the above problems, and an object of the present invention is to provide a multi-server system that can efficiently use the capacity of the entire system according to the situation of each server.

[0005]

According to the present invention, a plurality of terminals for sending a processing request and the requested processing according to the processing request sent from each terminal are executed and the operation status of the own apparatus is shown. Displays the operating status of each server based on the information sent from multiple servers and the information sent from each server to the system administrator, and also changes the operating status when the server to which the terminal is connected is changed. And a monitoring device for displaying this to the system administrator. In this way, the monitoring device displays the operating status of each server to the system administrator,
The system administrator can recognize the situation such as the load on each server, and if the server to which the terminal is connected is changed, the operation situation is displayed to the system administrator so that the situation of each server can be adjusted. It is possible to change the connection destination.

[0006]

1 is a block diagram of a multi-server system showing a first embodiment of the present invention. 1a to 1g are terminals that send processing requests, and 2a to 2c
Is a local area network (hereinafter referred to as LAN), 3a to 3c are servers that execute requested processing in response to processing requests sent from each terminal, 4a to 4c are databases that are data management mechanisms, and 5 is wide. Area network (hereinafter referred to as WAN), 6a to 6c are L
It is a gateway that performs protocol conversion between the ANs 2a to 2c and the WAN 5 and connects them. 7 is a monitoring device, which displays the operating status of each server to the system administrator based on the information sent from each server, and requests the change in the operating status when the connection destination of the terminal is changed. Is displayed to the system administrator.

A file server 3 having a data file function for managing each of the databases 4a-4c
a-3c are respectively connected to LAN2a-2c, and these LAN2a-2c are mutually connected by WAN5. In the present embodiment, the database 4b is the master database, and the databases 4a and 4c are
Has the same information as the master due to the snapshot function and the replication function.

Next, the operation of such a multi-server system will be described. First, in the initial state, the terminal 1a
1c is connected to the server 3a via the LAN 2a, and terminals 1d and 1e are connected to the server 3 via the LAN 2b.
b, the connection destinations of the terminals 1f and 1g are set to the server 3c via the LAN 2c. Each time the terminals 1a to 1g request processing to the connected servers 3a to 3c, the current time is acquired by a command of an OS (Operating System), and this is used as a transmission time together with the processing request and the servers 3a to 3c. 3c.

The servers 3a to 3c calculate the delay time required for communication with each terminal for each terminal and store the calculated delay time. That is, the difference between the transmission time sent from the terminals 1a to 1g together with the processing request and the time at which the server receives the processing request via the LANs 2a to 2c is defined as the communication delay time. However, this communication delay time is updated to the latest time each time a new processing request is received.

When receiving a processing request from a certain terminal, the servers 3a to 3c increase the request count value indicating the number of requests for each terminal by 1 for the corresponding terminal and are currently processing at the time when the processing is actually started. 1 is added to the execution count value indicating the number of cases. Then, when the processing is completed and the result has been transmitted to the requesting terminal, both count values are decremented by one.

Next, the monitoring device 7 connected to the LAN 2b requests the information on the operation status from the servers 3a to 3c when an instruction from the system administrator is input or at regular intervals. The connection between the monitoring device 7 and the server 3b is performed via the LAN 2b, and the connection between the monitoring device 7 and the server 3a or 3c is LAN 2b, the gateway 6b, the WAN 5, the gateway 6a or 6c, the LAN.
Via 2a or 2c.

Upon receiving the request from the monitoring device 7, the servers 3a to 3c measure the load of the device itself by the OS command or load measuring means (not shown), and measure the measured load,
The communication delay time for each terminal, the request count value for each terminal, and the execution count value for each terminal are transmitted to the monitoring device 7 as information on the operation status.

The monitoring device 7 displays the operation status of each server on the screen of the display device based on the information thus collected.
2 is a diagram showing a display example of the operation status of each server,
10 is a screen of the display device. Here, it is needless to say that the number of processing waiting states for each server is the total number of requested number count values for each terminal minus the number of executed number count values. In addition, the monitoring device 7 displays an alarm on the display screen if the operating conditions of each server reach a specified value set in advance by the system administrator,
Alternatively, an alarm sound is emitted to notify the system administrator.

Next, when the system administrator recognizes that the load of a certain server is excessive by the screen display as shown in FIG. 2 or the notification from the monitoring device 7, the system administrator considers changing the connection destination of the terminal. Here, since the load on the server 3a is excessive, for example, when the terminal 1c is designated as the terminal to be changed, the monitoring device 7 changes the connection destination of the designated terminal 1c to another server 3b, 3c. The change of is calculated by the following formula. Lnew = Lold × {Cr / (Cp + Cw)} (1) Tnew = STnew × (Told / STold) (2)

In the equation (1), Lnew is the load of the server after changing the connection destination, Lold is the load of the server before changing the connection destination, Cr is the number of requests from the terminal which is scheduled to change the connection destination, and Cp is the number of processes currently being processed. , Cw is the number of waiting cases. Also,
In equation (2), Tnew is the communication delay time after changing the connection destination, Told is the communication delay time before changing the connection destination, STnew is the reference time to the connection destination after the change, and STold is the reference time to the connection destination before the change. It's time. The reference time is an average communication delay time with the corresponding server, and is measured when the system is constructed and stored in the monitoring device 7.

When the connection destination of the terminal 1c is changed, the new load Lnew of the server 3a is as follows: the current load Lold of the server 3a is 150%, and the number of requests Cr of the terminal 1c is 8.
[Case], the number of cases Cp currently being processed by the server 3a is 10
[Case], the number of cases Cw waiting for processing by the server 3a is 6
Since it is [case], it becomes 75 [%] from the equation (1), which is a decrease of 75 [%] with respect to the current load Lold.

On the other hand, since the terminal 1c is connected,
The new load Lnew of the server 3b is the current load Lold of the server 3b is 30%, and the number of requests Cr of the terminal 1c is Cr.
Is 8 [cases], and the number of cases Cp currently being processed by the server 3b is 3
[Matter], the number of cases Cw waiting for processing by the server 3b is 0
Since it is [case], it becomes 80 [%] from the formula (1), which is an increase of 50 [%] with respect to the current load Lold. Similarly,
When the terminal 1c is connected, the new load Lnew of the server 3c is 50% for the load Lold and 8 for Cr.
Since [cases], Cp is 5 [cases], and Cw is 0 [cases], 80 [%] is obtained from the formula (1), which is an increase of 30 [%].

The communication delay time Tnew between the terminal 1c and the server 3b is the communication delay time Told between the terminal 1c and the server 3a of 5 seconds, and the reference time STold to the server 3a is 5 seconds. ], The reference time STnew to the server 3b is set to 15 [seconds]
[Sec] becomes 10 with respect to the current delay time Told.
[Seconds] increase.

Similarly, the communication delay time Tnew between the terminal 1c and the server 3c is the reference time ST for the server 3c.
If new is set to 7.5 [seconds], 7.5 is obtained from the equation (2).
[Seconds], which is 2.5 with respect to the current delay time Told.
[Seconds] increase. The monitoring device 7 displays the change in the operation status calculated in this way on the screen 10 of the display device as shown in FIG.
To be displayed.

When the system administrator looks at the screen of FIG. 3 and designates, for example, the server 3c as the connection destination of the terminal 1c,
The monitoring device 7 sends a command to the terminal 1c to switch the connection to the server 3c. When you receive this command,
The terminal 1c changes the subsequent processing request destination to the server 3c as indicated by the broken line in FIG. Then, when the system administrator looks at the screen in FIG. 2 and the load on the server 3a has settled down, the system administrator gives an instruction to the monitoring device 7 to specify the server 3a as the connection destination of the terminal 1c. As a result, a command for switching the connection is sent from the monitoring device 7 to the terminal 1c, and the terminal 1c is connected to the server 3a.

[0021]

According to the present invention, since the monitoring device displays the operating status of each server, the system administrator can recognize the status of the load of each server, and the monitoring device connects to the connection destination of the terminal. By displaying the change in the operating status when the server is changed, it is possible to change the connection destination according to the status of each server, so it is possible to quickly and effectively improve the operation according to the situation. Therefore, the capacity of the entire system can be efficiently used.

[Brief description of drawings]

FIG. 1 is a block diagram of a multi-server system showing a first embodiment of the present invention.

FIG. 2 is a diagram showing a display example of an operation status regarding each server.

FIG. 3 is a diagram showing a display example of changes in the operational status of each server.

FIG. 4 is a block diagram of a conventional multi-server system.

[Explanation of symbols]

1a to 1g ... Terminals, 2a to 2c ... LAN, 3a to 3c ...
Server, 4a-4c ... Database, 5 ... WAN, 6
a-6c ... Gateway, 7 ... Monitoring device.

Claims (1)

[Claims] 1. A plurality of terminals for sending a processing request, and a plurality of servers for executing requested processing in response to a processing request sent from each terminal and sending information indicating an operation status of the own device. , The operation status of each server is displayed to the system administrator based on the information sent from each server, and the operation status change is requested when the server to which the terminal is connected is changed. A multi-server system having a monitoring device for displaying the information.