JPH0773061A - System for determining host arranged in standby system in hot standby system - Google Patents

Abstract

PURPOSE:To properly and dynamically arrange a logical system in accordance with the load balance of the whole of the hot standby system consisting of three or more hosts by displaying the optimum host, by which the standby system of the logical system should be started, to a system operator. CONSTITUTION:This system consists of the current system and the standby system of the logical system as essential components of the hot standby system, a logical system condition monitor device 23, an inter-host communication equipment 24, a host load calculating device 25 in the host connected to an operation monitor terminal 4, a host load number storage device 26, a host load condition storage device 27, and a host load coefficient display device 28, and these device 23 to 28 are arranged in each host. Thus, an online system is safely operated with less variance of the load balance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a standby system arrangement host determination method in hot standby.

[0002]

2. Description of the Related Art In implementing an online system, a system that executes a job at that point (hereinafter referred to as an operating system) and a system that always stands by so that the job can be performed (hereinafter referred to as a standby system) are arranged, A hot standby system in which a standby system takes over the work and operates in a very short time when an abnormality occurs is known in the art. In a system in which a plurality of (three or more) host computers are arranged, it is generally difficult for the system operator to decide which host computer the standby system should be arranged in. Conventionally, the system designer statically arranged the standby system. .

[0003]

The above-described method of determining the standby system placement host in the conventional hot standby system can be operated in a system in which only one active system / standby system pair (hereinafter referred to as a logical system) exists. However, in the configuration with multiple logical systems, it was necessary to design the system considering the capacity of each host so that the load would not be concentrated on one host.

Further, there is a drawback that the host capacity is wasted in normal operation because the host processing capacity must be designed with a margin in consideration of the case where the load is concentrated on one host.

[0005]

According to the standby system allocation host determination method in a hot standby system of the present invention, a standby system allocation host determination method in a hot standby system in which a plurality of host computers are loosely coupled is used. And the logical system status monitoring device that monitors the presence or absence of the logical system of the standby system and each operating system for each host computer, the inter-host communication device that enables mutual communication between host computers, and the time when system installation is performed in advance A host load evaluation number storage device for storing the host load number given by the above, and a hot standby system is configured based on information obtained via the inter-host communication device and information existing in the host load number storage device. Calculates the load on each host computer and evaluates the host load status The present invention is characterized by having a host load calculation device stored in the device and an operation monitoring terminal for taking out load information of each host from the host load status storage device and allowing a system operator to carry out system operation instructions and inquiries. .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1 showing an embodiment of the present invention,
This embodiment is a hot standby system using three host computers 1, 2, and 3. The host computer 1 includes a logical system # 1 operating system 11, a logical system # 3 standby system 12, a logical system status monitoring device 13, and an inter-host communication device 14, and the host computer 3 includes a logical system # 3 operating system 31 and a logical system. A # 2 standby system 32, a logical system status monitoring device 33, and an inter-host communication device 34, and both host computers have the same configuration. However, the host computer 2 has a logical system # 2 operating system 21, a logical system # 1 standby system 2
2. In addition to the logical system status monitoring device 23 and the inter-host communication device 24, the host load calculation device 25, the host load number storage device 26, the host load status storage device 27, and the host load coefficient display device 28 are provided. The coefficient display device 28 is connected to the operation monitoring terminal 4.

FIG. 2 is a diagram showing the storage status of the host load status stored in the host load status storage device 27. This figure shows the host load status at the moment when all the logical systems are in the steady state. Here, the logical system means a set of business processing programs, and the steady state means a state in which an active system and a standby system exist in the logical system.

In this host load status, the number of the host computer is arranged on the vertical axis and the number of the logical system is arranged on the horizontal axis. Logical system # 1, # 2, # 3
Are the load numbers 40, 60, 25 during operation of the operating system, respectively.
Is given. The black circles described in the elements of the matrix indicate that the logical system is operating (in the active system) or waiting (in the standby system) on the host computer. The information corresponding to this black circle is updated every time the state of the logical system is changed, and holds the latest state. When the state of the logical system is changed, the load coefficient for each host computer 1, 2, 3 is calculated next. In the example of this figure, the logical system
Since there is an active system of 1 and a standby system of the logical system # 3, and the load numbers are 40 and 25, respectively, the load coefficient of the host computer 1 is 65 of 40 + 25. Similarly, the load factors of the host computers 2 and 3 can be calculated as 100 and 85, respectively.

FIG. 2 is a diagram showing the load status of the host computers 1, 2, and 3 immediately after the system switching by the hot standby of the logical system # 1 occurs. It can be seen that the standby system of the logical system # 1 operating in the host computer 2 has changed to the active system, and the standby system of the logical system # 1 does not exist. The system operator compares the load factors of the respective host computers to determine whether the host computer with the lowest load factor, in this example, the host computer 1, has the logical system #
It can be judged that it is sufficient to start the standby system of 1.

Now, returning to FIG. 1, a detailed description of the operation will be given. Logical systems 11, 12, 21, 22, 31, and 3 arranged in each host computer 1, 2, 3
Reference numeral 2 denotes logical system status monitoring devices 13, 23, and 33 arranged in the respective host computers 1, 2, and 3, respectively.
Is notified to the operating status of the logical system.
The logical system status monitoring devices 13, 23, and 33 bundle the information for each host computer 1, 2, and 3 based on this notification. That is, in the example of FIG. 2, for example, the host computer 1 is the information that the logical system # 1 is the active system and the logical system # 3 is the standby system. The bundled information passes through the inter-host communication devices 14, 24, 34 which are devices for controlling data transmission / reception between the hosts, and the inter-host communication devices 14, 24, 34 respectively.
Stored in.

On the other hand, the number of logical systems and the number of loads thereof are prepared by the system builder based on the information obtained by the performance test etc. at the time of constructing the system and stored in advance in the host load evaluation formula storage device 26. ing. The host load calculation device 25 is shown in FIG. 2 from the information of the logical system bundled for each host for the inter-host communication device 24 and the number of loads peculiar to the logical system stored in the host load evaluation formula storage device 26. The matrix as described above is generated and stored in the host load status storage device 27.

The operation monitoring terminal 4 is installed for the purpose of conversation with the system operator, and is an apparatus capable of displaying an instruction from the system operator, an inquiry request, and a response. At the time of starting the logic system, the system operator requests the host load coefficient display device 28 from the operation monitoring terminal 4 to display the screen as shown in FIGS.

The host load coefficient display device 28 acquires the host load condition from the host load condition storage device 27 and displays the condition of each host to the system operator. The system operator can check the load on each host and activate the logical system on the host computer with the lowest load.

In addition to the above embodiments, the host computers 1 and 3 are also provided with a host load calculation device, a host load number storage device, a host load status storage device, and a host load coefficient display device, and the respective host load coefficients are provided. An embodiment in which a display device is connected to the operation monitoring device 4 is also conceivable. According to this embodiment, there is an effect that the host load coefficient can be displayed regardless of which host computer is used.

Further, an embodiment is conceivable in which a plurality of levels are provided to the standby system to give priority to each other and the logical system is arranged between the active system and the plurality of standby systems according to the load balance.

[0016]

As described above, according to the present invention, in a hot standby system composed of three or more hosts, the system operator can determine which host is most suitable for starting the standby system of the logical system. By displaying it, it becomes possible to appropriately and dynamically arrange the logical system according to the load balance of the entire hot standby system.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a host computer load status storage state in a steady state according to the present invention.

FIG. 3 is an explanatory diagram of a host computer load status storage state when a system switchover of the present invention occurs.

[Explanation of symbols]

 1 host computer 2 host computer 3 host computer 4 operation monitoring terminal 11 logical system # 1 operating system 12 logical system # 3 standby system 13 logical system status monitoring device 14 inter-host communication device 21 logical system # 2 operating system 22 logical system # 1 Standby system 23 Logical system status monitoring device 24 Inter-host communication device 25 Host load calculation device 26 Host load evaluation formula storage device 27 Host load status storage device 28 Host load coefficient display device 31 Logical system # 3 Active system 32 Logical system # 2 Standby System 33 Logical system status monitoring device 34 Inter-host communication device

Claims (3)

[Claims] 1. In a standby system host deciding method in a hot standby system in which a plurality of host computers are loosely coupled, the presence / absence of the active system and standby system of the logical system and the logical system of each active system A logical system status monitoring device for monitoring, an inter-host communication device that enables mutual communication between host computers, a host load evaluation number storage device for storing the host load number given at the time of system installation in advance, A host load that calculates the load of each host computer that constitutes the hot standby system based on the information obtained via the inter-host communication device and the information that exists in the host load number storage device and stores it in the host load status storage device From the calculation device and the host load status storage device, System operator retrieves the information service instructions and the system
A method for determining a host for arranging a standby system in a hot standby system, which has an operation monitoring terminal for executing an inquiry. 2. The standby in the hot standby system according to claim 1, wherein the host load number storage device, the host load calculation device, the host load status storage device, and the host load coefficient display device are provided in each host computer. System allocation host determination method. 3. The standby system arrangement host determination method in a hot standby system according to claim 1, wherein the standby system is a plurality of prioritized systems.