JPS6240557A - Logout system - Google Patents

Abstract

PURPOSE:To improve the reliability of a system by bringing an abnormality which has been detected by a transfer device having no service processor (SVP) interface, to logout to an SVP through a processor from said transfer device. CONSTITUTION:When a transfer device (CH) 2 has detected an abnormality of itself and an input/output device I/O 3 being under its control, a bus use request word is sent out in order to report said abnormality as a channel status word CSW, but in that case, abnormality cause information which cannot be represented by the CSW is loaded on an undefined part of the bus request work, and sent out by adding newly a log request flag to a flat part, and setting it. A CPU 1 analyzes this bus use request word, knows that it is a command from the CH 2, and a log request exists, holds it, and thereafter, executes an interruption to an SVP 5, and executes the log request. The SVP 5 receives this log request and inputs log information which has been held. When a bus use permission is received, the CSW is written in a prescribed area of a main storage device (MEM) 4.

Description

[Detailed Description of the Invention] [Summary] A transfer device (channel) that does not have an interface with a service processor (hereinafter abbreviated as SVP)
Using the undefined part of the bus usage request word when reporting completion to a processing device with a P interface, log information about abnormalities in the transfer device itself or input/output devices can be stored in the SVP via the processing device. This makes it possible to record the details of the cause of a failure, which cannot be determined from the channel status word (C3W) alone.

[Industrial Application Field] The present invention relates to a logout method for information regarding an abnormality in a transfer device (such as a channel device) or an abnormality in an input/output device.

In recent years, many electronic computers have come equipped with dedicated processors, ie, service processors, for system monitoring, maintenance, and diagnosis.

The service processor connects each device with a service link separate from the system bus that connects the central processing unit, main memory, channel devices, etc., collects status information of each device, and uses it for monitoring, maintenance, and diagnosis. Take control.

The present invention relates to a method for logging out from a transfer device that does not have a service processor interface in a central processing unit that has a service processor interface.

[Prior Art] When a conventional transfer device without an SVP interface detects an abnormality in itself or an input/output device, it simply reports it using a channel status word (C3W).

[Problems to be Solved by the Invention] According to the above-mentioned prior art, when an abnormality occurs in the input/output device itself or an input/output device, the only way to report it is through a channel status word, which only indicates that an abnormality has occurred. , there was a problem that the details of the cause of the abnormality could not be expressed.

The present invention aims to provide a new logout method that solves these problems.

c. Means for Solving Problem] FIG. 1 shows a block diagram of the principle of the logout method of the present invention.

In FIG. 1, ■ is a processing unit (CPU) that controls the entire system, and 2 is an input/output device (Il) connected to processing unit l via a bus and under its control.
o) A transfer device (CH) that mediates the control and transfer of 3.

4 is a main memory (MEM) which is connected to the bus and stores programs and data; 5 is connected to the processing unit l through a service link separate from the bus, and which controls the system for monitoring, maintenance, and diagnosis. This is the svp to do.

The transfer device (CH) 2 transmits the results of the operation with the input/output device (Ilo) 3 to the processing device (CPU) via the bus.
Notify 1.

At this time, the transfer device (CH) 2 sends a bus use request word to the bus to request the right to use the bus.

The bus use request word includes the command type, sending unit number, and flag, but usually leaves many undefined parts.

When the transfer device (CH) 2 detects an abnormality in itself or the input/output device (Ilo) 3 under its control, it sends out a bus use request word to report it as a channel status word (C3W). Abnormal cause information that cannot be expressed in the channel status word (C3W) is placed in the undefined part of the bus use request word.
Add a new log request flag to the flag section, set it, and send.

Processing unit (CPU) 1 analyzes this bus use request word, learns that it is a command from transfer device (CH) 2 and that there is a log request, and after holding this, interrupts 5VP5 and sends the log request. conduct.

5VP5 receives this log request and takes in the retained log information.

When the transfer device (C:H) 2 receives permission to use the bus, it writes a channel state word (CSW) into a predetermined area of the main memory device (MEM) 40.

[Effect: As explained above, the channel state word (C5W) is transmitted from the transfer device (CH) 2 that does not have an SVP interface.
Detailed abnormality cause information that cannot be expressed in the 5VP5 can be stored in the 5VP5 via the processing unit (CPU) i by using the undefined part of the bus usage request word without creating a new bus command. It is something.

[Example] The present invention will be described in more detail below with reference to Examples shown in FIGS. 2 and 3.

FIG. 2 shows a system configuration diagram of an embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same objects.

central processing unit (CPtJ) through the system bus
, main memory (MEM) 2, and 4 channel devices (
Channel devices (CH) 2.2', 2", 2"" are connected to input/output devices (Ilo) 3.3', 3", respectively.

3゛° is connected.

In this system, the data width of the system bus is 8 bytes wide.

The 5VP5 is connected only to the central processing unit (cpu) through a service link that is separate from the system bus.

FIG. 3 shows a format 7) of a bus use request word.

The bus use request word is 8 bytes, which is the same as the data width of the system bus, and the 0th byte is a command part, and carries a code indicating a processing request from CH to CPU, for example.

The first byte is a unit section, and contains, for example, the own channel number.

The second byte is a flag part that modifies the processing content, and has flags such as interrupt request, interrupt permission, etc., and is sent with the corresponding flag set.

A new log request flag is provided in the undefined bit of this flag section.

The third to seventh bytes indicated by diagonal hatching in FIG. 3 were undefined, but this part is used as the log data section and ) 3 is abnormal, log information such as the cause of the abnormality is placed here, a log request flag is set, and the log is sent.

The central processing unit (CPU) 1 examines the bus use request word,
When the log request flag is "l", this information is held, interrupts 5VP5, and requests a log.

Upon receiving this, the 5VP5 takes in and accumulates the log information.

[Effects of the Invention] As described above, according to the present invention, a channel state word ( It becomes possible to know the details of the cause of a failure that cannot be determined with C3W alone, which has an extremely large effect in improving the reliability of the system and contributing to the early repair of malfunctioning devices.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a system configuration diagram of an embodiment of the present invention, and FIG. 3 is a format diagram of a bus use request word. In the drawing, l is a processing unit (CPU), 2 is a transfer device (CH), 3 is an input/output device (r10), 4 is a main memory (MEM), and 5 is a service processor (SVP). Each is shown below. AJB Japan is in the middle of the day.
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Claims (1)

[Claims] A processing device (1) having an interface with a service processor (5), and a transfer device controlled by a bus connection with the processing device (1) and having no interface with the service processor (5). (2) In an information processing system including
3) When an abnormality is detected, the detailed information of the abnormality is placed in the undefined part of the bus use request word, and
A flag indicating the validity of the undefined portion is provided in the flag portion and reported, and when the flag is set, the processing device (1) interrupts the service processor (5) and sends a logout request. A logout method characterized by being configured as follows.