JPH02264346A - Input/output processing system - Google Patents

Abstract

PURPOSE:To secure write-in data by executing error processing by providing processing to decide the presence of the occurrence of a write-in error after waiting the completion of write-in to an input/output apparatus. CONSTITUTION:An AP 10 issues a write-in instruction with no synchronizing IO option for from data A 12 to the data one before the data Z 13. It adds the synchronizing IO option 40 to the write-in instruction for the final data Z 13. An OS 20 executes the processing to write in all the data including the data stored in a cache memory till when into a floppy disk in conformity to the synchronizing IO option 40. The presence of the occurrence of a retry unrecoverable error in the OS at the time of the write-in is written in, and an answer is given to the AP 10 as the report 50 of a result, and the instruction is completed. According to the report 50 of the written-in result from the OS 20, the AP 10 executes the error processing 60 in the case of the occurrence of the error. Thus, the reliability of the floppy disk is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to hard error recovery processing for computer systems, and is particularly effective for floppy disk input/output processing using a cache memory.

[Conventional technology]

The conventional processing method is to allow buffer addresses to be freely placed in the main memory address space after data transfer between the main memory and the input/output device is completed, as described in Japanese Unexamined Patent Publication No. 183767/1983. The idea was to achieve high-speed data transfer and improve processor throughput.

[Problem to be solved by the invention]

The above conventional technology does not take into consideration error handling (hardware CRC errors, etc.) when data is written from the buffer memory to the input/output device, and there is no guarantee that the data has been correctly written to the input/output device. There was a problem that I couldn't do it.

The purpose of the present invention is to speed up the processing, add processing to wait for the completion of writing to the input/output device, and determine whether a writing error has occurred, and perform error handling (exchanging the medium or writing to another input/output device). The objective is to guarantee write data through alternative storage processing).

[Means to solve the problem]

The above purpose is controlled by the presence or absence of the synchronous process 0 option of the write command issued by the AP to the input/output device. A
P is synchronous IO from the beginning of write data to the last -1
A write command is issued without any options, and the command is terminated by simply writing to the cache memory. When it is the final data, a write command is issued with the synchronous process 0 option, data is written to the input/output device including the data already stored in the cache memory, and the AP receives a report as to whether an error has occurred. Since the result of writing to the input/output device is returned to the AP, the AP can perform error processing (exchanging the medium or storing it in another input/output device).

[For production]

When the AP divides the data on the main memory and writes it to the input/output device, it uses the synchronous IO option added to the write command depending on whether it is the first data to the last data -1 or the final data. If the synchronous IO option is "none" for the write command issued by the AP, the O8 writes the data to the cache memory and reports completion to the AP.The AP issues the write command without the synchronous IO option up to the final data 1. and speed up the processing. The AP adds a synchronous IO option only for the final data, and causes the OS to write it to the input/output device along with the already accumulated data. O
8 reports to the AP an error that could not be recovered by trying to connect to O8 when writing to the input/output device. Upon receiving the error report, the AP can handle the error (exchanging the medium or storing it in another input/output device).

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. AP
IO is stored in the main memory 11 as write data to the floppy disk, from data A12 to data Z13 in write units. APlo is data A12 to data Z
13, the write command is issued without the synchronous IO option, so 0820 writes the data to the cache memory, the command ends, and returns completion to the AP. Synchronization I
By adding O option 40, the processing of 0820 is changed. 0520 executes the process of writing all data including the data accumulated in the cache memory to the floppy disk using the synchronization process 0 option 40, and a retry irrecoverable error (permanent hardware error) occurs in O8 when writing. The presence or absence of the occurrence is written as a result report 50 in response to APIO, and the command is completed. APIO is 082
Based on the write result report 50 from 0, if an error has occurred, error processing 60 is executed.

According to this embodiment, cache memory is used to speed up writing to the floppy disk, and in addition, a report of the results of writing to the floppy disk is received by adding an IO option synchronized with the final data. Yes, AP
Error processing (replacement of floppy disk media or alternative storage processing in a disk device) can be realized at the level.

【Effect of the invention〕

According to the present invention, in writing processing from an AP to a floppy disk, in addition to speeding up data transfer by using cache memory, the AP can also check whether an error has occurred (permanent hardware error) as a result of writing to the floppy disk. Reported.

When the AP receives the occurrence of an error, it can perform rewriting by replacing the floppy disk medium or perform alternative storage processing on a disk device, which has the effect of improving reliability.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a writing process to a floppy disk, which is an embodiment of the present invention. 10...AP, 11...main memory, 12...data A. 13... Data 2.20... O8, 21... Cache memory, 30... Floppy disk, 40...
...Synchronous IO option, 50...Write result report, 60...Error handling.

Claims (1)

[Claims] 1. Consisting of main memory, cache memory, and input/output devices, if a permanent write error occurs during the process of storing data in main memory to the input/output device, the medium can be replaced at the AP level or other input/output devices can be replaced. An input/output processing method characterized by having an alternative storage processing mechanism set up.