JPS61282951A - Detection system for execution request - Google Patents

Abstract

PURPOSE:To minimize the time required for the scanning of logic numbers by adding a first-in first-out hard queue, where a logic number and a state number are stored when the state is changed in this logic number, to each interface part. CONSTITUTION:when one of logic numbers 1-n is set to the data transfer request state, a control circuit 200 sets the data transfer request to a state management area corresponding to a subchannel as the state number and stores the logic number and the state number in the hard queue of a pertinent interface part and transfers the control to an execution request detection processing. In the execution request detection processing, the control part scans the hard queues of individual interface part; and if the storage of the logic number and the state number in the hard queue is confirmed in this scanning, the control part stops scanning and takes out the logic number and the logic state from the hard queue and compares this state number with the state number in the state management area of the subchannel indicated by the logic number, and the data transfer start processing is performed if they coincide with each other and the state number indicates the data transfer request.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an execution request detection method, and more particularly to an execution request detection method for a data relay distribution device in a storage conversion system.

[Prior art]

The conventional data relay distribution device as described above is individually connected to an interface between a central processing unit and a transfer control device connected to a main storage device, and to an interface between a plurality of lower-level devices. The interface unit for the CPU is provided with an execution display of the interface and a logical number register under execution, so that the state of the logical numbers instructed by the central processing unit can be individually managed.

FIG. 2 is a diagram showing the configuration of a conventional storage and conversion system in order to clarify the positioning of the data relay distribution device in the system. In Figure 2, 10 is a pass, 11
is a central processing unit, 12 is a main storage device, 13 is a transfer control device, 14 is a data relay distribution device, 15 is a magnetic disk device which is one of the lower-order devices, and 16 is an inter-office device which is another one of the lower-order devices. 20 represents a transfer control device interface (hereinafter referred to as interface X); 21 represents a magnetic disk device (interface Y); and 22 represents an inter-office transfer device interface (interface 2). This figure shows the arrangement of the data relay distribution device to which the method of the present invention is applied in the storage/conversion system.

FIG. 3 is a block diagram showing an example of the configuration of the control unit in the conventional execution request detection method of the data relay distribution device 14, in which 9,100 is a control circuit; 101°102.10
3 are interfaces x and y, respectively.

Z (7) Execution display, 104, 105, 106 are the same <running logical number registers for each of interfaces x, y, z, 107 is a logical number decoder.

108, 109, and 110 are respectively the central processing unit 11,
Main storage device 12. A status display register 140 for the transfer control 13 indicates a data buffer. Note that the input/output section 150, together with the execution display 101 and the executing logical number register 104, constitutes one interface section of the data relay distribution device, although no frame is attached in the figure. .105 set and 170,103,10
Each of the six sets also constitutes one interface section.

FIG. 4 is a diagram for explaining the operation of the above-mentioned conventional method, and shows state data A in the state management area corresponding to the logical number.
-F is controlled by sequentially scanning from logical number 1 to logical number n, and if it is in the data transfer request state for each interface, check the use indication of the corresponding interface part,
If it is in the empty state, the logical number making the data transfer request is stored in the logical number storage area of the corresponding interface section, and the use indication is set to "in use" to perform data transfer with other devices.

When the data transfer is completed, the use display of the corresponding interface section is cleared. When there is another data transfer request, the status data in the status management area is used as the data transfer request and the process waits until the next scan.

[Problems to be solved by the present invention]

However, in the conventional method described above, if there are many logical numbers to be scanned, a large amount of time is spent in detecting a data transfer request depending on the position at which scanning is started.

Figure 5 is a diagram showing the relationship between logical number (subchannel number) processing, execution request detection processing, and transfer in one interface in the above operation.As can be seen from Figure 2, the logical number during operation If there is one logical number to scan and there are many logical numbers to scan, if the scanning of the corresponding logical number is completed immediately before the data transfer, the data transfer request will not be detected until the scan completes one cycle, resulting in multiple data transfers. However, when this method is used, there is a disadvantage that unnecessary scanning is performed and the transfer takes time for the amount of scanning.

Therefore, an object of the present invention is to provide an execution request detection method that minimizes the time required to scan a logical number regardless of the size of the logical number and shortens the transfer time as much as possible.

[Means for solving problems]

In order to solve the above-mentioned problems, the execution request detection method of the present invention individually detects the Execution request detection method in a data relay distribution device connected to the data relay distribution device, wherein the interface unit is provided with an execution display of the interface and an execution logical number register, and the status of logical numbers instructed by the central processing unit is individually managed. When a state change occurs in a logical number, a first-in/first-out format hard queue is individually added to the interface section to store the logical number and state number, and thereby each interface section of the logical number is Detection of a processing request for the interface is performed by scanning each of the interface units.

〔Example〕

FIG. 1 is a diagram showing the configuration of an embodiment of a data relay distribution device to which the method of the present invention is applied, and is different from the conventional device shown in FIG. A first-in system that stores logical numbers and state numbers in three interface parts that correspond individually to interfaces x, y, and z.
First out hard cue 210, 220. and 230 respectively, and the control unit 2 accordingly.
The configuration of 00 is the control circuit 100 in the conventional device shown in FIG.
This is a system with additional functions to perform the operations described below.

6 and 7 are diagrams for explaining the operation of the execution request detection method of the present invention in the apparatus of FIG. 1, as well as logical number processing, execution request detection processing, and 1 in the operation.
FIG. 3 is a diagram showing transfer relationships in an interface.

The following explanation will be given with reference to FIGS. 1, 6, and 7. A state change 2, for example, A
When the state changes from to B, that is, when the data transfer request state occurs, the control circuit 200 sets a data transfer request as a state number in the state management area corresponding to the subchannel, and writes a logical The number and status number are stored, and control is transferred to execution request detection processing.

In the execution request detection process, the control unit sequentially scans the hard queue of each interface unit, and when it confirms that the logical number and state number are loaded into the hard queue during the scan, it stops the scan and reads the logical number and state number from the hard queue. Compare the state number in the state management area of the subchannel indicated by the logical number with the state number retrieved from the hard queue, and if they match and the state number is a data transfer request, that is, it is unused. If there is, change the in-use display of the corresponding interface from not in use to in use, and store the logical number retrieved from the hard queue in the logical number storage area.Storing the logical number in the logical number storage area is data transfer. This is to know the transfer end subchannel at the time of completion, and when storage is completed, data transfer start processing is performed and data transfer is started.If the in use indication of the corresponding interface is in use, the corresponding logical number and Load the status number into the node of the corresponding interface section and wait until the corresponding interface becomes free.

When data transfer activation processing for the relevant interface is completed or when the relevant interface is in use and the logical number and status number are returned to the hard queue.

The execution request detection process starts scanning other interfaces, and when it is confirmed that the logical number and status number are loaded in the node key of the other interface as described above, data transfer of the subchannel indicated by the logical number is started.

In other words, when a data transfer request occurs in a subchannel, the state number is changed, the state number is stored in the state management area, and a logical number indicating the subchannel is added to the first-in, first-out format hard queue of the interface that always requests the transfer. and the status number, and the execution request is detected by the execution request detection process via the first-in/first-out format hard 1 key of each interface. It is possible to eliminate idle scanning of subchannels and shorten the unused time of data transfer of each interface section.

〔Effect of the invention〕

As explained above, the present invention can detect an execution request for each subchannel without missing an execution request in the execution request detection process after an execution request, thereby reducing the free transfer time of each interface and Efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment of a data relay distribution device to which the method of the present invention is applied, and FIG. 2 is a diagram showing the configuration of a storage conversion system having the data relay distribution device as one of the components. FIG. 3 is a diagram showing an example of the configuration of a control unit in a conventional execution request detection method of a data relay distribution device, FIG. 4 is a diagram for explaining the operation of the above-mentioned conventional method, and FIG. A diagram showing the relationship between logical number processing, execution request detection processing, and transfer in one interface in the operation of the method, FIG. 6 is a diagram for explaining the operation of the method of the present invention, and FIG. 7 is a diagram for explaining the operation of the method of the present invention. In the operation of the method, logical number processing and execution request detection processing are performed. FIG. 3 is a diagram illustrating a transfer relationship in one interface. Explanation of symbols: 10 is path, 11 is central processing unit. 12 is a main storage device, 13 is a transfer control device, 14 is a data relay distribution device, and 15 is a magnetic disk device. 16 is an interoffice transfer device, and 20 is an interface X. 30 is interface Y, 401'i'f interface 7 ace Z, 101, 102, 103 are interface x-
x X, Y, ZO execution display, 104, 105
゜106 are running logical number registers for interfaces X, Y, and Z, respectively; 107 is a logical number decoder; 108
, 109, 110 are circuits, 1112.13 are status display registers, 140 are data buffers, 150, 1
Reference numerals 60 and 170 indicate input/output sections of the interface section, 200 indicates a control circuit, and 210, 220, and 230 indicate hard queues, respectively.

Claims (1)

[Claims] (1) Individually connected to an interface between the central processing unit and the transfer control device connected to the main storage device and an interface between a plurality of lower-level devices, and displaying an execution display of the interface on the interface section for each of the interfaces. and an executing logical number register,
In the execution request detection method in the data relay distribution device in which the state of logical numbers instructed by the central processing unit is individually managed, when a state change occurs in the logical number in the interface section, the logical number and the state are First-in, first-out format hard queues for storing numbers are individually added, so that a processing request for each interface section of a logical number is detected by scanning each interface section. Featured execution request detection method.