JPS6275848A - Report system for abnormal state of subsystem - Google Patents

Abstract

PURPOSE:To attain a report system for abnormal state with high efficiency by reporting the detailed information on the abnormal state to a host in case the abnormality occurs when the count value of a timer reaches a prescribed level. CONSTITUTION:When a microprocessor 1 detects the abnormality, an FF 2 is set but an FF 5 is not set as long as the count value of an idle counter 3 has no overflow. Then a 3-input AND circuit 6 produces no output. When the count value of the counter 3 has an overflow, the FF 5 is set by the output of the overflow output. The processor 1 delivers the access reception signal if an access is given from a host in case both FF 2 and 5 are set, i.e., the abnormality is produced within a subsystem and also the total sum of the time when no access is given from the host is larger than the prescribed value. Then the circuit 6 produces and output to switch a multiplexer 7 and sends the detailed information on the abnormality sent from the processor 1 to the host.

Description

[Detailed Description of the Invention] [Summary] A timer is provided to cumulatively count the time during which the subsystem is not accessed by the host, and if an abnormality exists when the timer measures a predetermined time, the abnormality is detected. This is to report the information to the host.

[Industrial application field]

If an abnormal condition within a subsystem can be detected by the host during access, there is no need to provide a means for the subsystem to report the abnormal condition to the host. If there is a failure on one side of the equipment being used, this subsystem continues to operate normally, so it is impossible to identify the abnormality from the processing details, and functions that are not directly controlled by the host or Since equipment abnormalities are not detected, it is necessary to report from the subsystem to the host at a frequency that is not overlooked by the subsystem or the operator, and in a manner that does not significantly affect access between the subsystem and the host. There is.

The present invention relates to a method for reporting such an abnormal state of a subsystem to a host.

[Conventional technology and its problems]

Conventionally, as a means of notifying the abnormal state of a subsystem, there is a method of providing a display means such as a failure indicator light or an alarm buzzer on the subsystem itself without reporting it to the host.
This method does not ensure that subsystems are recognized when they are installed far away from the operator, and another method is to continuously display failures to the host so that maintenance personnel or There are some systems in which the operator confirms this and operates a switch to stop the failure display and continue possible processing, but in this case, the processing not only temporarily stops but also requires intervention. , there was a possibility of forgetting the occurrence of an abnormal character condition.

[Means for solving problems]

A clock device is installed in the subsystem that cumulatively measures the time that has not been accessed by the host, and if there is an abnormality in this subsystem when the clock value of this clock device reaches a predetermined value, details about the abnormal state are provided. Information is now reported to the host.

〔Example〕

The figure shows an embodiment of a subsystem according to the invention,
Only essential parts related to the present invention are shown.

The microprocessor (1) has the function of periodically monitoring abnormalities within the subsystem and detecting and storing detailed information. In the case of a semiconductor disk device equipped with a micro magnetic disk device that loads or saves to and from memory, the information stored in the entire semiconductor memory is read out and 1B/L errors are corrected using ECC codes. Abnormality detection is carried out while writing again, or abnormality detection of the micromagnetic disk device by attempting writing to and reading from a specific area of the micromagnetic disk, etc., is periodically and repeatedly performed. As a result of this monitoring, if an abnormality is detected, the first flip-flop (2) is set, and if no abnormality is detected, this flip-flop (2) is reset.

The idle counter (3) measures time by counting the output counter of the clock generator (4), and starts counting when a signal is applied to its start terminal (St,), and outputs the hold terminal (H) to the idle counter (3). ) When a signal is applied to the terminal (R), counting is stopped while holding the counted value, and when a signal is applied to the reset terminal (R), the counter is set. Then, when the count value of this idle counter (3) overflows,
Its output is adapted to set the second flip-flop (5).

Now, if an abnormality is detected as a result of the microprocessor (1) monitoring, the first flip-flop (2
) is set, but at this time the idle counter (3)
If the count value does not overflow, the second flip-flop (5) is not set and the three-person AND circuit (6) does not produce an output.

In this state, the idle counter (3) continues to count the clocks and eventually when its count overflows, its overflow output sets the second flip-flop (5). However, if the host requests access to this subsystem during the period leading up to this overflow output, during that period the access acceptance signal output from the microprocessor (1) to the conductor (10) will be output to the idle counter ( Since it is applied to the hold terminal (H) of counter (3), the count value does not increase during this access request period, and the count value of this counter (3) corresponds to a period in which there is no access request from the host. The time required for this counter (3) to overflow may be about 15 minutes in the case of the above-mentioned semiconductor disk device.

In this way, the first and second flip-flops (2,
5) are sent, that is, when there is an error in this subsystem and the cumulative amount of time that the host does not access it reaches a predetermined abnormal value, if there is an access from the host to this subsystem. Microprocessor sensor detects this access and connects the conductor (10)
The three-man AND circuit (6) generates an output to switch the multiplexer (7) and transfer the detailed information about the abnormality from the microprocessor (1) to the information requested by the host. Send to the host instead. Note that after the microprocessor (1) has finished sending out this detailed information, it sends out a reset signal on the conductor (11) to reset the idle counter (3) and the second flip-flop (5), and then sends out a reset signal on the conductor (11). 12
) to start this counter (3) again.

〔Effect of the invention〕

According to the present invention, if there are few accesses from the host, reporting is performed more frequently, and if there are many accesses from the host, reporting is performed less frequently, so there is little impact on access between the host and the subsystem. Nevertheless, an efficient abnormal condition reporting method is obtained.

[Brief explanation of drawings]

The figure shows an embodiment of the present invention, in which 1 is a microprocessor that has the function of periodically diagnosing and storing equipment and functions within the subsystem, and 3 is an idle counter that counts the cumulative amount of time that is not accessed by the host. It is. Patent applicant: Fujitsu Co., Ltd.゛<:i-4

Claims (1)

[Scope of Claims] A system comprising: a diagnostic means (1) for periodically diagnosing and storing devices and functions within a subsystem; and a time measuring means (3) for cumulatively measuring time not accessed by a host; When an abnormality is detected by the means (1) and the timer (5) indicates that the cumulative value of the time of no access from the host has reached a predetermined value, the detailed information of the abnormality is transmitted to the host. An abnormal state reporting method for a subsystem, characterized in that it reports on.