JPH0612360A - Input/output control system for extended storage device - Google Patents

Abstract

PURPOSE:To efficiently perform input/output control over the extended storage device by, performing load control over a data transfer request to the extended storage device by an arithmetic processor and an input/output processor and performing well-balanced allocation. CONSTITUTION:When a transfer system selecting means 38 selects asynchronous transfer, an asynchronous transfer request quantity adding means 29 counts up the number of requests to areas corresponding to input/output processors 15-18 which perform the transfer of an asynchronous transfer state table 26. The requests are counted down by an asynchronous transfer request quantity subtracting means 28. A 1st asynchronous transfer selecting means 32 refers to the asynchronous transfer state table 26 when the asynchronous transfer is selected and totalizes the number of asynchronous transfer requests to the input/output processors 15-18 connected to system controllers 19 and 20. An input/output processors which is small in the number of requests among input/ output processors connected to the system controller which is less in the number of requests is selected as an input/output processor for synchronous transfer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to input / output control for data transfer of an extended storage device in an electronic computer system, and more particularly to arithmetic processing connected from a plurality of system control devices and connected to each system control device. For an input / output control method of an extended storage device in an electronic computer system including an extended storage device which is a storage device of a semiconductor memory device capable of transferring data between a main storage device and an apparatus through an input / output processing device Is.

[0002]

2. Description of the Related Art A magnetic disk drive, which is a conventional high-speed access file drive, has a transfer method only for data transfer (asynchronous transfer) via an input / output processing device.

[0003]

The expansion storage device can select two transfer methods, that is, a synchronous transfer and an asynchronous transfer from the arithmetic processing unit and the input / output processing unit. However, if the synchronous transfer is frequently selected for high-speed transfer. There is a problem that the efficiency of multiple processing of program execution using I / O interrupts becomes poor, and it is necessary to select both types efficiently.

[0004]

According to a first aspect of the present invention, an input / output control system for an extended storage device uses an arithmetic processing unit to send an input / output request from a user program to a file secured in the extended storage device to a main storage device. Synchronous transfer means for transferring data using a transfer command between the expanded storage devices, and an input / output request from a user program for a file secured in the expanded storage device is processed by an input / output command to the input / output processing device. Asynchronous transfer means for transferring data asynchronously with the program execution on the arithmetic processing unit by receiving the end of transfer by the input / output interrupt, and an input / output request from the user program for the file secured on the extended storage device. Selects the transfer size calculation means that calculates and holds the data transfer size of the request input / output when it is accepted, and the synchronous transfer at the time of data transfer Data transfer size of the determined previous request input selecting an asynchronous transfer is one and a determining transfer method selection means whether exceeds the threshold value.

An input / output control method for an extended storage device according to another invention of the present invention is the input / output processing connected to each system control device when asynchronous transfer is selected by the transfer method selection means in the first invention. The number of asynchronous transfer requests to the device is counted from the asynchronous transfer status table that holds the number of asynchronous transfer requests for each I / O processor, and the asynchronous is selected by selecting the I / O processor that is connected to the system controller with the few asynchronous transfer requests. First asynchronous transfer selection means for performing transfer, asynchronous transfer request number addition means for adding the number of requests to the corresponding area of the asynchronous transfer status table of the target I / O processing device when asynchronous transfer is selected, and asynchronous transfer status table Asynchronous transfer request number subtraction means for subtracting the same request number at the end of transfer.

An input / output control method for an extended storage device according to yet another aspect of the present invention is the arithmetic processing connected to each system control device when asynchronous transfer is selected by the transfer method selection means in the first invention. A second asynchronous transfer selecting means for counting the dispatch status of the device from the dispatch status table and selecting an input / output processing device connected to the system control device having a small number of processing devices being dispatched for asynchronous transfer is there.

An input / output control system for an extended storage device according to another invention of the present invention is the arithmetic processing device according to the first invention, which is connected to each system control device when asynchronous transfer is selected by the transfer system selection means. Third asynchronous transfer selection means for counting the number of synchronous transfer execution states from the synchronous transfer status table and selecting an input / output processing device connected to the system control device having a small number of arithmetic processing devices during synchronous transfer; And a synchronous transfer execution identifying means for turning on the flag of the target arithmetic processing unit of the synchronous transfer processing status table when the synchronous transfer is selected by the selecting means and turning off the flag when the synchronous transfer is completed.

An input / output control method for an extended storage device according to yet another aspect of the present invention is the input / output control method for an extended storage device according to the first aspect, when asynchronous transfer is selected by the transfer method selection means. Synchronized by the occurrence of a failure in a fourth asynchronous transfer selecting means for referring to the failure flag of the processing device and selecting an input / output processing device that is not in a failed state for asynchronous transfer, and in the connection port of the extended storage device and the system control device. Expanded storage that determines the abnormal end status of a port failure when transfer or asynchronous transfer ends abnormally, and turns on the failure flag in the failure identification table that exists for all I / O processors connected to this system controller And a device failure identification means.

[0009]

According to the present invention, the data transfer request of the expansion storage device is load-controlled by the arithmetic processing unit and the input / output processing unit so as to be allocated in a well-balanced manner.

[0010]

FIG. 1 is a block diagram showing an embodiment of the present invention. In this FIG. 1, 11, 12 and 13, 14
Are arithmetic processing units connected to the respective system control units 19 and 20, and 15, 16, 17, and 18 are input / output processing units. 23 is connected from a plurality of system control devices, and is connected between the main processing device 21 via the arithmetic processing devices 11 to 14 connected to the system control devices 19 and 20 and the input / output processing devices 15 to 18. The electronic computer system includes an extended storage device 22, which is a storage device of a semiconductor memory device capable of data transfer.
24 is an extended storage device failure identification table, 25 is a dispatch status table, 26 is an asynchronous transfer status table, 2
Reference numeral 7 is a synchronous transfer status table.

Reference numeral 28 denotes an asynchronous transfer request number subtracting means for subtracting the same request number at the end of asynchronous transfer. Reference numeral 29 denotes an asynchronous transfer status table 26 in a corresponding area of the asynchronous transfer status table 26 of the target input / output processing device when the asynchronous transfer is selected. Asynchronous transfer request number adding means for adding the number of requests, 30 is a transfer method selecting means 38 for turning on the flag of the target arithmetic processing unit of the synchronous transfer status table 27 when the synchronous transfer is selected and turning off the flag at the end of the synchronous transfer. Transfer execution identifying means 31 is an extended storage device 22 and a system control device 19,
When synchronous transfer or asynchronous transfer ends abnormally due to the occurrence of a failure in the connection port part of 20, the abnormal end status of the port part failure is determined, and it exists corresponding to all the input / output processing devices connected to the system control devices 19 and 20. The extended storage device failure identification means for turning on the failure flag of the failure identification table.

Reference numeral 32 denotes an asynchronous transfer status table which holds the number of asynchronous transfer requests to the input / output processing devices connected to each system controller when the transfer method selecting means selects the asynchronous transfer. First asynchronous transfer selecting means for performing asynchronous transfer by selecting an input / output processing device connected to the system control device having a small number of asynchronous transfer requests counted from 26, and 33 when the asynchronous transfer is selected by the transfer method selecting means. The dispatch statuses of the arithmetic processing units 11 to 14 connected to the respective system control units 19 and 20 are counted from the dispatch status table 25, and the input / output processing unit connected to the system control unit having the few arithmetic processing units being dispatched is selected. Second to perform asynchronous transfer
Asynchronous transfer selection means 34, 34 counts the synchronous transfer execution status of the arithmetic processing units 11 to 14 connected to the system control devices 19 and 20 from the synchronous transfer status table 27 when the transfer method selection means 38 selects asynchronous transfer. Third asynchronous transfer selecting means for selecting an input / output processing device connected to a system control device having a small number of arithmetic processing devices performing synchronous transfer.
Reference numeral 5 is a fourth method for performing asynchronous transfer by selecting an input / output processing device which is not in a failed state by referring to the failure flag of each input / output processing device of the extended storage device failure identification table 24 when the transfer method selection means 38 selects asynchronous transfer. Is an asynchronous transfer selecting means.

Reference numeral 36 denotes a synchronous transfer means for transferring an input / output request from a user program for a file secured in the extended storage device 22 by using a transfer instruction between the main storage device and the extended storage device in the arithmetic processing unit. Reference numeral 37 denotes a program execution on the arithmetic processing unit by processing an input / output request from a user program for a file secured in the expanded storage device 22 by an input / output command to the input / output processing device and receiving a transfer end by an input / output interrupt. Is an asynchronous transfer means for asynchronously transferring data, and 38 is a judgment as to whether to select synchronous transfer or asynchronous transfer during data transfer. Whether the data transfer size of the previous request input / output exceeds the threshold value 40. The transfer mode selection means 39, which is determined by, receives an input / output request from the user program 42 for a file secured in the extended storage device. With a transfer size calculating means holds to calculate the data transfer size requested output when the. Reference numeral 41 denotes these extended storage device failure identification tables 24 to
This is an input / output control system for an extended storage device, which comprises a threshold value 40.

FIG. 2 is an explanatory diagram for explaining the operation of FIG.
1A shows a configuration of a portion related to the electronic computer system 23 in FIG. 1, and FIG. 1B shows a configuration table of the electronic computer system. The SCU is the system controller, IO
P is an input / output processing unit, and EPU is an arithmetic processing unit. In FIG. 2A, the same reference numerals as those in FIG. 1 indicate corresponding parts. 3 (a), (b) and (c) are flowcharts provided for explaining the operation of the first invention. 4 (a),
(B), (c), (d) is an explanatory diagram for explaining the operation of the second invention, (a) is an asynchronous transfer status table 26,
The SCU number indicates the system control unit number, the IOP number indicates the input / output processing unit number, and the request number indicates the asynchronous transfer request number. (B), (c) and (d) are flowcharts. FIG. 5 is an explanatory diagram for explaining the operation of the third invention,
(A) shows the dispatch status table 25, EPU
The number is the number of the arithmetic processing unit. (B) shows a flowchart. FIG. 6 is an explanatory diagram for explaining the operation of the fourth invention, (a) shows a synchronous transfer processing status table 27,
(B) and (c) show flowcharts. FIG. 7 is an explanatory diagram for explaining the operation of the fifth invention. (A) shows the extended storage device failure identification table 24, and (b) and (c) show flowcharts.

Next, the operation of the embodiment shown in FIG. 1 will be described with reference to FIGS. User program after 4
The control of the input / output request from the file 2 to the file secured in the extended storage device 22 will be described. First, referring to FIG. 3, the transfer size calculating means 39 calculates the total data size of the input / output request of the user program 42 in step 101, and the transfer method selecting means 38 compares it with the transfer size of the threshold value 40. Is performed (step 102). When the transfer size is smaller than the threshold value 40, the transfer method selecting means 38 selects the synchronous transfer because the occupied time of the arithmetic processing unit can be short even if the synchronous transfer is executed and the influence on other programs is small (step 103). If it is larger than the threshold value 40, the occupied time of the arithmetic processing unit in the synchronous transfer becomes large, and the overhead of the operating system due to the asynchronous transfer is superior, so the asynchronous transfer is selected considering the influence on the system (step 104).

When the synchronous transfer is selected by the transfer system selection means 38, the synchronous transfer means 36 is an arithmetic processing unit in which the self-program is executing the transfer data of the user program 42, and the synchronous transfer means 36 of the main storage device 21 and the extended storage device 22. Data is transferred using the transfer instruction (step 105). Then, when the asynchronous transfer is selected, the asynchronous transfer means 37 gives a data transfer instruction between the main storage device 21 and the extended storage device 22 to any device of the input / output processing devices 15 to 18 as an input / output command. When the end of the transfer is received by the input / output interrupt, the data transfer is performed asynchronously with the program execution on the arithmetic processing unit (step 106).

In order to efficiently perform input / output to / from the expanded storage device 22, data transfer requests issued from the arithmetic processing units 11 to 14 and the input / output processing units 15 to 18 to the system control units 19 and 20 should not be biased. Need to Next, the method will be described. For the following description, the system control devices 19 and 20, the input / output processing devices 15 to 1
8. The device numbers are assigned to the arithmetic processing devices 11 to 14 as shown in FIG. Referring to FIG. 4, the asynchronous transfer status table 26 is a table for counting the number of asynchronous transfer requests for each of the input / output processing devices 15 to 18. When the transfer method selection unit 38 selects the asynchronous transfer, the asynchronous transfer status table 26 is asynchronous. The transfer request number adding means 29 counts up the number of requests to the area corresponding to the input / output processing device that transfers the asynchronous transfer status table 26 (step 201). This number of requests is counted down by the asynchronous transfer request number subtracting means 28 at the end of the asynchronous transfer (step 202,
203). Then, the first asynchronous transfer selection means 32
When the asynchronous transfer is selected, the asynchronous transfer status table 26 is referred to, the total number of asynchronous transfer requests of the input / output processing devices connected to each system control device is totaled, and the input / output processing device connected to the system control device having the smaller number of requests is input. Of the output processing devices, the input / output processing device with the smallest number of requests is selected as the input / output processing device for synchronous transfer (steps 204 to 204).
211). Here, IOP0 to 3 represent the number of asynchronous transfer requests to the input / output processing device numbers 0 to 3.

Next, referring to FIG. 5, the second asynchronous transfer selection means 33 indicates the dispatch status of each of the arithmetic processing units 11 to 14 in the dispatch status table 25, that is, the usage status, when selecting the input / output processing apparatus. The I / O processing device connected to the system control device having the smaller number of operating processing devices in use of each system control device is selected (steps 301 to 304). Next, referring to FIG. 6, the synchronous transfer status table 27 is stored in each arithmetic processing unit 11
14 to 14 are tables for managing the synchronous transfer execution states, and the synchronous transfer execution identifying means 30 sets the flag of the arithmetic processing unit of the synchronous transfer target of the synchronous transfer status table 27 when the synchronous transfer is selected by the transfer method selecting means 38. Turn on and turn off the flag at the end of synchronous transfer (step 401,
402). Then, the third asynchronous transfer selection means 34 indicates the number of synchronous transfer executions of the arithmetic processing units connected to each system control unit when the asynchronous transfer is selected, in the synchronous transfer status table 27.
, And selects the input / output processing unit connected to the system control unit having the smaller number of arithmetic processing units executing the synchronous transfer as the input / output processing unit requesting the asynchronous transfer (steps 403 to 406). .

Next, referring to FIG. 7, the extended storage device failure identification table 24 is a table holding the failure states of the input / output processing devices 15 to 18 as failure flags. Then, the extended storage device failure identification means 31 determines an abnormal status when the synchronous or asynchronous transfer ends abnormally, and relates to a transfer path such as a connection port failure of the system control devices 19 and 20 and the extended storage device 22. When it is determined that there is a failure, the expanded storage device failure identification table 24
The failure flags corresponding to all the input / output processing devices of the system control device connected to the input / output processing device or the arithmetic processing device for detecting the failure are turned on (steps 501 to 50).
3). Then, the fourth asynchronous transfer selection means 35 refers to the failure flag of each input / output processing device of the extended storage device failure identification table 24 when the asynchronous transfer is selected, and asynchronously selects the input / output processing device in which no failure has occurred. Select for transfer request (step 504).

[0020]

As described above, according to the present invention, the data transfer request of the extended storage device is load-balanced by the arithmetic processing unit and the input / output processing unit and is allocated in a well-balanced manner. Since the control is efficiently performed, there is an effect that the balance between the synchronous transfer and the asynchronous transfer is lost and the other program execution of the system is not adversely affected. Further, with respect to the port failure, there is an effect that the spread of the failure can be suppressed in advance.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing a configuration of the electronic computer system shown in FIG.

FIG. 3 is a flowchart for explaining the operation of the first invention.

FIG. 4 is an explanatory diagram for explaining the operation of the second invention.

FIG. 5 is an explanatory diagram for explaining the operation of the third invention.

FIG. 6 is an explanatory diagram for explaining the operation of the fourth invention.

FIG. 7 is an explanatory diagram for explaining the operation of the fifth invention.

[Explanation of symbols]

 11-14 Arithmetic processing unit 15-18 Input / output processing unit 19,20 System control unit 21 Main storage unit 22 Extended storage unit 23 Electronic computer system 24 Extended storage unit failure identification table 25 Dispatch status table 26 Asynchronous transfer status table 27 Synchronous transfer Status table 28 Asynchronous transfer request number subtraction means 29 Asynchronous transfer request number addition means 30 Synchronous transfer execution identification means 31 Extended storage device failure identification means 32 to 35 Asynchronous transfer selection means 36 Synchronous transfer means 37 Asynchronous transfer means 38 Transfer method selection means 39 Transfer size calculation means 40 Threshold value 42 User program

Claims (5)

[Claims] 1. Connected from a plurality of system control devices,
An electronic computer system including an extended storage device which is a storage device of a semiconductor memory device capable of transferring data between a main storage device and an arithmetic processing device connected to each system control device and an input / output processing device. And a synchronous transfer means for transferring, in the arithmetic processing unit, an input / output request from a user program for a file secured in the extended storage device by using a transfer instruction between the main storage device and the extended storage device. By processing an input / output request from a user program for a file secured in the extended storage device by an input / output command to the input / output processing device and receiving a transfer end by an input / output interrupt, Asynchronous transfer means for transferring data asynchronously with program execution, and user for files secured in the expansion storage device The transfer size calculation means for calculating and retaining the data transfer size of the request input / output when the I / O request from the program is received, and the judgment as to whether to select the synchronous transfer or the asynchronous transfer during the data transfer are performed first. And an input / output control method for an extended storage device, which comprises a transfer method selection unit that determines whether the data transfer size of the requested input / output exceeds a threshold value. 2. The input / output control method for an extended storage device according to claim 1, wherein the number of asynchronous transfer requests to the input / output processing device connected to each system control device is input / output when asynchronous transfer is selected by the transfer method selection means. First asynchronous transfer selection for performing asynchronous transfer by selecting an input / output processing device connected to a system control device having a small number of asynchronous transfer requests by counting from the asynchronous transfer status table that holds the number of asynchronous transfer requests for each processing device And an asynchronous transfer status table, the asynchronous transfer request number adding means for adding the number of requests to the corresponding area of the asynchronous transfer status table of the target I / O processing device when the asynchronous transfer is selected, and the same request number for subtracting the same at the end of the asynchronous transfer An input / output control system for an extended storage device, comprising: an asynchronous transfer request number subtraction unit. 3. The input / output control method of the extended storage device according to claim 1, wherein the dispatch status of the arithmetic processing unit connected to each system control unit is counted from the dispatch status table when asynchronous transfer is selected by the transfer method selection means. I / O of the extended storage device, further comprising second asynchronous transfer selection means for selecting an I / O processing device connected to the system control device having a small number of processing devices being dispatched and performing an asynchronous transfer. control method. 4. The input / output control method for an extended storage device according to claim 1, wherein the synchronous transfer execution status of the arithmetic processing unit connected to each system control apparatus when the transfer method selection unit selects asynchronous transfer is the synchronous transfer status. Third asynchronous transfer selection means for selecting an input / output processing device connected to a system control device having a small number of arithmetic processing devices performing synchronous transfer by counting from a table, and synchronous transfer processing when the synchronous transfer is selected by the transfer method selection device An input / output control system for an extended storage device, comprising: a synchronous transfer execution identifying means for turning on a flag of a target arithmetic processing unit of the status table and turning off the flag at the end of the synchronous transfer. 5. The input / output control method for an expanded storage device according to claim 1, wherein when the transfer method selection means selects asynchronous transfer, a failure is referred to by referring to a failure flag of each input / output processing device in the expanded storage device failure identification table. Fourth asynchronous transfer selection means for selecting an input / output processing device that is not in a state and performing asynchronous transfer, and a port when the synchronous transfer or the asynchronous transfer ends abnormally due to a failure in the connection port unit of the expansion storage device and the system control device An extended storage device failure identification means for determining an abnormal termination status of a partial failure and turning on a failure flag of a failure identification table existing corresponding to all input / output processing devices connected to this system control device. I / O control method of the extended storage device.