JPS5922149A - Alternation control system of history storage device - Google Patents

Abstract

PURPOSE:To store output information up to the occurrence of an error in an external device intermittently for several times every time an error occurs to a main body, by placing a couple of history storage devices in storing operation and output operation alternately. CONSTITUTION:The history storage devices 13 and 15 operate by an internal clock A or external clock B. When one history storage device is selected, a clock selecting circuit 11 selects the clocks A and B differently for the devices 13 and 15. Then, the clocks are selected reversely by an alternation signal triggered by an error signal. This alternating mechanism does not operate when one device is in output operation and operates when in stand-by mode. Further, output selection is performed to select the output of the side where the external clock B is selected. In this case, output information by the internal clock A is stored in the history storage device.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a history storage device that stores the operation history of a computer system.9. In particular, the present invention relates to a method of collecting accumulated data exceeding the physical capacity of a history storage device and also accumulating data during output.

(2) Prior Art and Problems A history storage device is a device that has the function of storing changes in important internal signals of a computer system over a certain period of time. By carefully selecting the internal numbers 46 to be stored, it is possible to capture the quality of the time series of the internal state of the computer system, that is, its operation history.

In the conventional system, a set of such history storage devices is installed, and one selected internal signal is stored for about 256 cycles, and when a failure is detected, the history storage device is frozen. . After issuing a request to output the contents to an external device, the main unit is restarted. The history storage device is of a type in which new history data is not stored and is discarded until the output of the contents is completed.

On the other hand, since output processing is significantly slower than the operating speed of the main unit, there is a high possibility that new failures will be detected during output.
The conventional method has the drawback that information in such cases cannot be collected, and there is a risk that important fault information may be missed.

(3) Purpose of the Invention It is an object of the present invention to solve the drawbacks of the previous dC and to provide a system that can collect all necessary log information.

(4) Structure of the invention The object is to arrange a pair of history devices, a system clock (internal clock) as a clock for controlling the history storage device, and an external clock that can be controlled from the outside. While the storage device is controlled by the system clock and accumulates data, the other history storage device is in a state where it can output the accumulated data to the outside by an external clock, and when the output is finished, it enters a standby mode, A means is provided for switching the clock image signal to an accumulation mode and a standby mode using an error signal as a trigger, and the pair of history storage devices are alternately switched to an accumulation operation and an output operation, and each time an error occurs in the main body, the history up to that time is A replacement control method for a history storage device is achieved, which is characterized in that output information is intermittently stored in an external device many times. .

(5) Examples of the invention The present application will be described in detail below with reference to the drawings.

The figure is a functional block diagram showing one embodiment of the present invention.

In the figure, 11 is a clock selection circuit, 12 is a history control circuit A, 13 is a history storage device 4M, 14 is a history control circuit B, 15 is a history storage device M2, 16 is an MPX, 17 is output information, and A is an internal Clock, B is an external clock, and D is a standby mode set.

What is a history storage device? A device that stores several internal signals of a machine system over a certain period of time. By carefully selecting the internal signals to be stored, the operation/fjI! of changes in the internal state of the computer can be controlled. History can be accurately grasped.

The present invention improves the control method of the history storage device so that it is possible to collect accumulated data exceeding the physical capacity of the history storage device, and to also accumulate data during output operation. For this purpose, two sets of history storage devices having equivalent functions are provided, and each of the history storage devices is capable of outputting data.While one of the history storage devices is storing data, the other one stops storing data and is only capable of outputting data. Then, from the side that is stopped, the contents are output to an external device.

When the output ends, it enters standby mode, and can be switched to storage mode at any time.

At this time, the other It3ii1 storage device u is performing an accumulation operation, so even if another error occurs while the other one is outputting, data will not be omitted due to history information up to that point not being recorded. It looks like this.

Furthermore, the mechanism for switching the operation modes of both history storage devices may be configured by switching the control clock using an error signal or the like as a trigger. The mechanism switches the operating modes of both history storage devices, and the history storage device currently storing data stops.
Those that are waiting will start accumulating. In the figure, there are two sets of history storage devices Ml13°X215, both with internal clock A.
or an external clock B. When either history storage device is selected, the clock selection circuit 1 selects the clock selection circuit 1, and the history storage device M1 selects 3.
and X215, clocks on different sides (internal clock A,
External clock B) is selected.

Furthermore, the clock selection is reversed by a switching signal triggered by an error signal. However, the switching mechanism does not work while one side is outputting, but works when one is in standby mode.

Furthermore, output selection is performed by M P X16, which selects the output on which external clock B is selected.

At this time, output information based on the internal clock is stored in the history storage device.

(6) As described in detail, according to the present invention, the contents of the history storage device are alternately output and accumulated to an external device while the system is operating, and errors can be prevented for as long as possible. Each time an event occurs, the output information up to that point can be collected as many times as the capacity of the history storage device.

[Brief explanation of drawings]

The figure is a functional block diagram showing one embodiment of the present invention.

Claims (1)

[Claims] In a system equipped with a pair of history storage devices, a system clock (internal clock) as a clock that controls the history storage devices, and an external clock that can be controlled from the outside, one of the history storage devices is controlled by the system clock and stores data. During this time, the other history storage device is in a state where it can output the accumulated data externally using an external clock, and when the output is finished, it enters the standby mode, and the error signal is triggered by the clock signal and the data is accumulated. providing a means for switching between a mode and a standby mode, and switching the pair of history storage devices alternately between an accumulation operation and an output operation;
A replacement control method for a history storage device characterized in that each time an error occurs in the main body, output information up to that point is intermittently stored in an external device many times.