JPH04160531A - Cross call controller - Google Patents

Abstract

PURPOSE:To discriminate whether a cross call controller can be continuously used or not at the time of recovery from trouble due to trouble processing of an information processor by providing a flag indicating that the monopolized state is released. CONSTITUTION:A timer part 6 monitors the time to disconnection from issue of a request for information transmission/reception from the information proces sor; and when this time exceeds a prescribed value, the part 6 sends a reset signal to logic parts 3 and 4 and a switching part 5 to return them to the initial state. At this time, the flag indicating that they are returned to the initial state by the signal from the timer part 6 is set to a display part 7. When trouble is restored, the flag of the display part 7 is confirmed through a host interface 2. Thus, it is discriminated whether the cross call controller can be continuously used or not when trouble is restored by trouble processing of the information processor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cross-call control device, and particularly in a system consisting of an information processing device and a file device connected to the information processing device by cross-call, the present invention relates to The present invention relates to a cross-call control device that performs connection control.

[Conventional technology]

Conventionally, in this type of cross-call control device, while information is being exchanged with one information processing device, if there is a request for information exchange from another information processing device, this new information is In response to a transfer request, by sending a response signal indicating that the information processing device is already in use, it is indicated that the information processing device on the other side of the information processing device that issued the request is already in use. Was. However, if a failure occurs in the information processing device that is using the magnetic disk device while it is still in use, this I(?:'1) The file device cannot be used by the information processing device, and if this failure is not recovered, it will cause serious problems.

Therefore, the cross-call control device monitors the exchange of information with the information processing device, and if it is exclusively used by one of the information processing devices for a certain period of time, it forcibly releases this exclusive state. Although a timer circuit was installed, it was not possible to display on the information processing equipment that this forced release had occurred, so after the fault in the information processing equipment was recovered,
It was impossible to determine whether the cross-call control device of each information processing device was exclusive to the white system, or whether it was forcibly released and used by another system, and it was difficult to determine whether it would continue to be used thereafter. For this reason, information processing equipment that is likely to be used for relatively long periods of time to handle such failures cannot use this forced release function, resulting in the problem of not being able to release the proprietary state when a failure occurs. was happening.

[Problem to be solved by the invention]

"In the conventional dual cross-call control device, it is difficult to determine whether the timer circuit has forcibly released the device and returned to the initial state, or whether the device has returned to the initial state due to normal operation, so information processing is difficult. There has been a problem in that it is not possible to determine whether or not the operation can continue after the failure processing of the information processing device is restored.An object of the present invention is to prevent the cross-over It is an object of the present invention to provide a cross-call control device that can determine whether to continue using the call control device.

[Means to solve the problem]

A cross-call control device of the present invention is a cross-call control device that cross-calls a file device to a plurality of information processing devices, and includes: (A) connected to a first information processing device; (B) a first logical unit for controlling the exchange of information between the first information processing apparatus and the file apparatus; a second logic unit for controlling the exchange of information, (
C) a switching unit that selects and switches the logic unit connected to the information processing device that has made the request to use the file device out of the first logic unit and the second logic unit and connects it to the file device side; D) A timer that monitors the time during which the file device is exclusively occupied by the first logical unit and the second logical unit, and forcibly releases this exclusive use when the time exceeds a predetermined value. (E) When the first logical unit is connected to the file device side and the forcible release is performed, a flag is displayed to indicate that the forcible release has been performed. (F) When the second logical unit is connected to the file device side and the forcible release is performed, a flag is set to indicate that the forcible release has been performed. and display the first
It is equipped with a display section.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

The cross-call control device shown in FIG. 1 is connected to a first information processing device via a host interface 1, and
A logic unit 3 for controlling the exchange of information between the information processing device and the file device is connected to the second information processing device via the host interface 2, and is connected to the second information processing device to control the exchange of information between the first information processing device and the file device. Logic unit 4 for controlling the exchange of information between the two, selects and switches the logic unit connected to the information processing device that has requested the use of the file device among the logic units 3 and 4, and connects the magnetic disk interface 9. A switching section 5, a logic section 3, and a logic section 4 connected to the file device side via
If the timer unit 6 and logic unit 3 are connected to the file device side, which monitors the time during which the file device is exclusively occupied and forcibly releases the exclusive use when the time exceeds a predetermined value. When the forced release is performed, if the display unit 7 and logic unit 4, which set a flag to display that the forced release has been performed, are connected to the file device side, the forced release is performed. It is comprised of a display section 8 that sets a flag to indicate that forced release has been performed.

The host interface 1 and the host interface 2 are interfaces for exchanging information between the cross-fold control device and the information processing device. Host interface 1 connects to logic unit 3 and host interface 2
is connected to the logic unit 4 to control the interface. The logic section 3 and the logic section 4 are connected to the switching section 5,
The interface signal from the logic unit 3 or 4 switched by the switching unit 5 is output via the disk interface 9. The timer section 6 includes the logic section 3 and the logic section 4.
The magnetic disk device monitors the interface with the information processing device in the logical unit 3. When the time exclusively occupied by the logic section 4 exceeds a specified value, a reset signal is output to return the logic section 3, the logic section 4, and the switching section 5 to their initial states. The display section 7 and the display section 8 are for remembering that such a reset has been performed. For example, if a reset is performed when the logic section 3 is occupied, the display section 7 and the display section 8 are used to remember that the logic section 4 is occupied again. When a reset is performed, a flag is set on the display section 8.

Next, the operation will be explained.

When there is a request for information transfer from the information processing device to the cross call control device through the host interface 1,
The switching unit 5 connects the host interface 1. Logic part 3. A disk interface 9 forms a path for exchanging information between the information processing device and the disk device. This path continues until the information processing device finishes transmitting and receiving information. During this time,
In response to a similar request input from the host interface 2, a response is made indicating that it is in use.

On the other hand, the timer section 6 monitors the period from the time when there is a request for information exchange from the information processing device until the above-mentioned disconnection is performed, and when this time exceeds a specified value, a reset signal is sent to the logic section. 31 to the logic unit 4 and switching unit 5, the respective states are returned to their initial states.

At this time, a signal from the timer section 6 sets a flag on the display section 7 indicating that the initial state shown in item 1 has been returned. When the host interface 2 is used, operations similar to those described above are performed.

Now, when a failure occurs in an information processing device, the information processing device performs recovery operations such as retrying and degeneracy, but if the failure is recovered through such recovery operations, the information processing device By checking the flag on the display section, it is possible to determine whether or not the failure processing is completed within the timeout period of the timer section 6 and subsequent processing can be continued. If this flag is not set, it indicates that the exclusive state has continued,
It is possible to continue as is, and if this flag is set, it indicates that initialization has been performed, so the software etc. should be notified of the abnormality display.

〔Effect of the invention〕

As explained above, the present invention monitors the exclusive period of information exchange from one information processing device, and if this exceeds a certain period of time, this exclusive use is determined to be an abnormality in the information processing device and the exclusive state is released. By doing so, it is possible to detect that an abnormality in one information processing device makes it impossible to use the other information processing device, and by providing a flag indicating that such cancellation has been performed, information processing This has the effect that it is possible to determine whether or not the cross-call control device can be continued to be used when the failure is recovered by device failure processing.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. 1.2...Host interface, 3,4...
...Logic part, 5...Switching part, 6...
・Timer section, 7, 8...Display section, 9...
・Magnetic disk interface □-space. Agent Patent Attorney Susumu Uchihara

Claims (1)

[Scope of Claims] 1. A cross-call control device for cross-calling a file device to a plurality of information processing devices, comprising: (A) a first information processing device connected to the first information processing device; (B) a first logic unit for controlling the exchange of information between the first information processing device and the file device; a second logic unit for controlling the exchange of information; (C) a logic connected to the information processing device that has made the request to use the file device among the first logic unit and the second logic unit; (D) a switching unit that selects and switches the section and connects it to the file device side; (D) monitors the time during which the file device is exclusively used by the first logical unit and the second logical unit; (E) a timer unit that forcibly releases this exclusive use when the value exceeds a value; The first step is to set a flag to indicate that the
(F) when the forced release is performed when the second logical unit is connected to the file device side;
A cross-call control device comprising: a first display unit that sets a flag to display that the forced release has been performed. 2. The cross-call control device according to claim 1, wherein the file device is a magnetic disk device. 3. The cross-call control device according to claim 1 and claim 2, wherein the timer section includes the first logic section and the second logic section.
The logical unit monitors the time during which the file device is exclusively occupied, and when the time exceeds a predetermined value, the exclusive use is forcibly canceled and the connection state is returned to the initial state. cross-call control device.