JPS58119063A - Computer system configuration control method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to configuration control of a computer system, and particularly to a suitable migration control method from a system with an auxiliary storage device to a system without an auxiliary storage device.

Generally, computer systems operate using a combination of a main storage device and a random access type auxiliary storage device. By treating the auxiliary storage device exactly the same as the main storage device with the support of the operating system, the application software can see that there is a sufficiently large main storage device without being aware of the existence of the auxiliary storage device. The system is now operational. Therefore, normally, the auxiliary storage device is an essential device for the operation of the computer system, and its stoppage will lead to the system stoppage. However, most auxiliary storage devices have mechanically movable parts such as rotating parts, and their reliability is inevitably lower than that of main memory devices and central processing units that do not have movable parts.

For this reason, if it is desired to maintain the operation of a computer system even when performing degenerate operation, system configuration control including an operating system that navigates the transition from a system with auxiliary storage to a system without is essential.

The contents and problems of the prior art will be explained using FIG. 1, #c2, and FIG. 3.

FIG. 1 shows an example of system configuration using an auxiliary storage device.

When operating as a normal auxiliary storage system with a lid, the main storage device 1 is divided into an operating system (0, 8) area 3, a resident program area 4, and a non-resident program execution area 5.

On the other hand, the auxiliary storage device 112 is divided into an OoS storage area 6, a resident program storage area 7, a non-resident program evacuation area 8, a non-resident program storage area 9, and a program storage area 10 for use in the non-resident area after configuration control is completed. Reading from the O0S area 6 and resident program area 7 of the auxiliary storage device 2 with respect to the 0.8 area 3 and resident program area 4 is performed at start time 11 when the system is normally started. On the other hand, the resident program execution area 5 is read out in program units by the non-resident program storage area 9 in the auxiliary storage device 2 and by the start-up 12 of the necessary program. Non-resident programs have a large capacity and a large number of programs, so they can be used according to priority when needed.
The data is read onto the main storage device 111. For this reason, it is necessary to interrupt the -tan processing in the middle of execution and hand over the execution area 5 to a program with a higher priority.
will occur.

Disconnecting the auxiliary storage device 2 from the system and running it as a system without auxiliary storage device abandons the execution of the above-mentioned non-resident program, which reduces the amount of time required for the non-resident program although it is functionally ephemeral. Execution area 5
A group of programs that can store all programs in the non-resident program execution area 5 and execute the minimum necessary functions without reading from or writing to the auxiliary memory [12] are stored as part of the resident programs. The conventional technique shown in Figure @1, which is nothing but executing the program 10 read into the non-resident area for these configuration controls, from the auxiliary storage 1
1f2, and performs continuous output 14 at system start after configuration control. However, in this method, the program that corresponds to the reason why the auxiliary storage device becomes unusable is read out from the auxiliary storage device, and it is not clear to what point the auxiliary storage device can be used before or after configuration control. 1.The problem lies in the fact that it cannot be clearly understood. In other words, reliability is hampered by the fact that the success or failure of configuration control is easily influenced by chance.

In order to solve this problem, FIGS. 2a and 2b show that the program required after executing the configuration control is stored on a paper tape 15 or a diskette 16, and the program is read at the time of configuration control 14. There are the following problems.

1) It is necessary to manually set the paper tape 15 or diskette 16, and automatic configuration control is not possible. Furthermore, since such configuration control is often required in emergencies, there is a high possibility of operational errors during reading, resulting in poor reliability.

2) Hardware for reading the paper tape 15 or diskette 16 is required.

3) In the case of paper tape 15, it takes a long time to read.

In FIG. 3, two CPUs 17-a and 17-b are prepared, and the I10 bus 19 can be connected to either CPU by means of the I10 bus changeover switch 18. The main storage device ti-a is used for normal area division, but the non-resident area 5-b of the main storage device 1-b stores in advance programs that will be required after execution of the configuration control. The I10 bus selector switch is normally set to CPU17-a.
Although it is tilted to the side, when an event occurs that makes the auxiliary storage device 12 unusable, it tilts to the CPU 17-b side and performs configuration control. Although this method is reliable and has a fast system switching speed, it has a cost problem because it leaves one CPU idle during normal times. In FIG. 3, 50 FiiN display device and 60 indicate a printer.

The purpose of the present invention is to maintain the minimum necessary functionality without the auxiliary storage device in the event that the auxiliary storage device is normally operated as an essential component, but if a reason occurs that makes the auxiliary storage device unavailable. An object of the present invention is to provide a system configuration control method that can automatically realize system configuration control in a short time for a total Ad system VC.

The present invention is characterized in that a non-resident program replacement program that is required after configuration control is executed is stored in a spare area of the main storage device that does not require the use of mechanical parts or human intervention. The spare area of the main storage device does not need to be executable by the processor, but only needs to be referenceable, so it has little influence on the design of a normally operated system.

An embodiment of the present invention will be described using FIGS. 4 and 5.

In the ts4 diagram, 22 indicates a configuration control program, 20 indicates an earthquake needle, and 21 indicates a configuration control implementation request signal.

Now, if an earthquake 1ti20 detects an earthquake that makes it impossible to use the auxiliary storage device 2, the configuration control program activation command 21 is transmitted from the seismograph 20 to the paralysis system 26 in the form of an external interrupt. . As a result, the configuration control program 22 is started, the auxiliary storage device use prohibition command 24 is issued to the resident program 4, the startup prohibition command 25 is issued to the non-resident program 9, and the successive process 14 is issued to the non-resident program alternative program 23. are executed respectively. A stop command 27 is issued to the auxiliary storage device f2, and processing is performed to prevent the auxiliary storage device [t2 from being destroyed. This is necessary in order to improve earthquake resistance by stopping the auxiliary storage device and to facilitate recovery after the fact. As a result, the computer system 26 will be operated only by the resident program 4, which is prohibited from using the auxiliary storage (12), and the non-resident program alternative program 23, and a system excluding the auxiliary storage has been established. Become.

Changes in area usage on the main memory 1 will be explained using FIG.

FIG. 5(a) shows a normal operation mode, which is almost the same as the known example, but a non-resident program alternative program storage area 28 is provided on the main storage device 1. This area 28 contains a non-resident program alternative program 23, which is read 11 from area 10 on the auxiliary storage device 2 at the time of normal system start.

FIG. 5(b) shows a state in which the non-resident program alternative program 23 that was in the area 28 at the time of the earthquake has been read into the non-resident program execution area 5.

FIG. 5(C) shows the layout on the main storage device 1 after reading is completed.

The time course of configuration control performed in this embodiment will be explained with reference to FIG. 8g6.

If at time t1 the seismograph 20 detects the occurrence of an earthquake of a magnitude that would impede the operation of the system with auxiliary storage device, the configuration control is immediately activated by the interrupt signal 21. First, in order to stop using the auxiliary storage device and safely stop the auxiliary storage device, the following process is performed.

When the time is over, all application software including processes that use the auxiliary storage device are prohibited from starting 32, and all future uses of the auxiliary storage device are stopped. This corresponds to the auxiliary storage device use prohibition command No. 1g 24, the activation prohibition command signal 25 for the non-resident program 9, etc. in FIG.

At the level of the time txt operation v-ning system,
A soft disconnection 33 of the auxiliary storage device is performed. Specifically, this includes canceling the transfer between the auxiliary storage device and the main storage device, issuing a reset command to the auxiliary storage device control circuit, and discontinuing the management of the auxiliary storage device.

Time t4: The auxiliary storage device generally has higher impact resistance when it is stopped than when it is in operation. Therefore, a power supply disconnection signal 34 to the auxiliary storage device is issued to stop the auxiliary storage device. By turning off the power, the read head, which is originally reserved for auxiliary storage, is saved! This function works to prevent accidents such as collision of the reading head with a magnetic surface, making it possible to recover after the fact in a short time.

time' ! 1 “”’? +During this period, the rotation of the auxiliary storage device is stopped 35.

Time t.times.-t8: Since the auxiliary storage device is disconnected from the system by the power supply cutoff signal 34, configuration of a system including only the main storage device is started. This configuration process begins with reading 36 of the program's execution edge from the main memory spare area.

Time t8 - Immediately after the reading 36 of the ftof program is completed, initialization processing 37 of the system only for the main storage system is performed.
will be carried out.

At time t e - tut, the system operation 38 of only the main storage system is started.

According to the present invention, it is possible to automatically control the system configuration with high reliability. As a side effect, since the main storage device free area is used, it is possible to control the system configuration with short processing time and low cost. Since it can be linked with external conditions, it has a wide range of applications, such as earthquake countermeasures and when maintaining auxiliary storage devices. It is possible to avoid system failure caused by a failure of the auxiliary storage device, which is the least reliable of the essential components of a computer system. etc. can be given.

[Brief explanation of the drawing]

Figures 1, 2, and 3 are explanatory diagrams of known examples; Figures 4 and 3 are explanatory diagrams of known examples;
FIG. 5 is an explanatory diagram of the example, and FIG. 6 shows its time chart. 1... Main storage device, 2... Auxiliary storage device, 5...
Non-resident program execution area, 10... Program using non-resident area after configuration system #, 23... Non-resident program No. 1tJ Tea 3I21 '$ 4 Picture tea su(tl)

Claims (1)

[Claims] 1. In a computer system having an auxiliary storage device having a rotating part, detecting whether or not the auxiliary storage device can be used continuously, and disconnecting the auxiliary storage device from the system when the auxiliary storage device cannot be used continuously. A method for controlling the configuration of a computer system, the method comprising: reconfiguring the computer system. 2. A program for an auxiliary storage device excluded system stored in a spare area of the main storage device when transitioning from a system with an auxiliary storage device according to claim 1 to a system excluding the auxiliary storage device 1. A method for controlling the configuration of a computer system, the method comprising the steps of: migrating the file to a commonly used main storage area and restarting the computer system. 3. A configuration control method for a computer system as set forth in claim 1, characterized in that a signal indicating that the auxiliary storage device cannot be used continuously is detected by an interrupt signal from an earthquake detector. 4. A configuration control method for a computing system according to claim 1, characterized in that a signal indicating that the auxiliary storage device cannot be used continuously is detected by an internal program.