JPH01171015A - Input/output load dispersion system - Google Patents

Abstract

PURPOSE:To average the input/output load of a double file and to improve a throughput by determining based on the input output load of a medium in which a file exists whether reading is executed from an original file or the reading is executed from a sub-file when the reading is executed from a double file. CONSTITUTION:The number of respective execution waiting input/output requests for two memory dedia 7 and 8 is counted by an execution waiting input/output request counting means 5. A reading medium selecting means 3 selects a memory medium 7 or 8 having a small number of the execution waiting input/output requests in accordance with the counting result of the execution waiting input/output request counting means 5 when a double file 9 or 10 is opened. An input output control means 4 controls an input/output means 6 in accordance with the selecting result of a reading medium selecting means 3. Thus, the input/output load of the double file is averaged and the throughput is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is applied to an input/output load distribution method for duplicated files. In particular, it relates to a method for determining a reading medium when reading from a duplexed file.

〔overview〕

The present invention provides an input/output method for a duplexed file by determining whether to read from a primary file or a subfile when reading from a duplexed file based on the input/output load of the medium on which the file exists. It averages the input/output load and improves throughput.

[Conventional technology]

Conventionally, reading from a duplexed file was always performed from the primary file, and reading from the secondary file was performed only when the primary file was unable to be input/output due to a failure or the like.

[Problem that the invention seeks to solve]

However, in this conventional method for reading from duplexed files, since reading is always performed from the positive file in normal cases, there is a drawback that input/output is concentrated on the medium where there are many positive files in the duplexed file. .

The present invention solves the above-mentioned drawbacks, and aims to provide an input/output load distribution method that can average the input/output load of a duplicated file.

[Means for solving problems]

The present invention provides a first storage medium including a duplicated file in which a primary file is recorded, a second storage medium including a duplicated file in which a secondary file is recorded, a means for simultaneously writing to the two primary and secondary files, and one of the primary and secondary files. In a duplex file input/output load distribution method including an input/output means including a means for reading from a file, an input/output request waiting to be executed counts each input/output request waiting to be executed to the two storage media of the input/output means. a counting means, a reading medium selecting means for selecting a storage medium with a small number of waiting-to-be-executed input/output requests according to the counting result of the waiting-to-be-executed input-output request counting means when a duplexed file is opened; The present invention is characterized by comprising input/output control means for controlling the input/output means.

[Effect]

A waiting-to-be-executed input/output request counting means counts the number of pending-to-be-executed input/output requests for each of the two storage media. The reading medium selection means selects a storage medium with a small number of waiting-to-be-executed input-output requests according to the count result of the waiting-to-be-executed input-output request counting means when the duplexed file is opened. The input/output control means controls the input/output means according to the selection result of the reading medium selection means. By the above operation, the input/output load of the duplicated file can be averaged. This reduces delays in waiting processing and processing time, and improves throughput.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. 1st
The figure is a block diagram of an input/output load balancing device according to an embodiment of the present invention. In FIG. 1, the input/output load distribution device includes a program means 1 for writing and reading a duplex file, a file open means 2 for outputting a start signal in response to a request to open the duplex file from the program means 1; A large-capacity storage medium 7 containing a duplexed file 9 where a primary file is created, a large-capacity storage medium 8 containing a duplexed file 10 where a secondary file is created, and a primary file and a secondary file on the large-capacity storage medium 7.8. It is provided with input/output means 6 including means for simultaneously writing and means for reading from a primary file or a subfile.

Here, the characteristics of the present invention are that the input/output means 6 includes a pending input/output request counting means 5 for counting the number of pending input/output requests for each large-capacity storage medium, and an activation signal for the file open means 2; A reading medium selection means 3 selects a storage medium with a small number of waiting input/output requests according to the count value of the waiting input/output request counting means 5; The output means 6 is controlled and the program 1 is read from the mass storage medium 7.8 via the input/output means 6.
This is because it is equipped with an input/output control means 4 that provides input/output control means.

The operation of the input/output load distribution device having such a configuration will be explained. FIG. 2 shows a flowchart showing the read operation of the input/output load balancing device of the present invention. Figures 1 and 2
In the figure, the waiting-to-be-executed input/output request counting means 5 counts and holds the number of pending-to-be-executed input/output requests for the large-capacity storage medium 7.8 on which the duplexed file 9 and the duplexed file 10 exist (■>).

Upon receiving a duplex file open request from the program means 1, the file open means 2 activates the read medium selection means 3 (■).

The read medium selection means 3 obtains the number of pending I/O requests of the mass storage medium 7.8 from the pending I/O request counting means 5, and selects the medium with fewer pending I/O requests as the read medium (■ ).

Upon receiving a read request from the duplexed file from the program means 1, the input/output control means 4 instructs the input/output means 6 to read from the medium selected by the read medium selection means. The input/output means 6 reads from the large capacity storage medium selected by the input/output control means 4 and outputs it to the program means 1 (■).

〔Effect of the invention〕

As described above, the present invention has the excellent effect of averaging the input/output load of duplicated files and improving throughput.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an input/output load balancing device according to an embodiment of the present invention. FIG. 2 is a flowchart showing the read operation of the input/output load balancing device of the present invention. DESCRIPTION OF SYMBOLS 1... Program means, 2... File open means, 3... Reading medium selection means, 4... Input/output control means, 5... Execution waiting input/output request counting means, 6...
Input/output means, 7.8... Mass storage medium, 9.10.
・Duplicate file.

Claims (1)

[Claims] (1) A first storage medium including a duplex file in which the primary file is recorded, a second storage medium including the duplex file in which the sub file is recorded, a means for simultaneously writing to the two primary and secondary files, and one of the primary and secondary files. In an input/output load distribution method for a duplex file that includes an input/output means including a means for reading from a file, an execution-waiting input/output request count that counts each execution-waiting input/output request to the two storage media of the input/output means. a reading medium selecting means for selecting a storage medium with a small number of waiting-to-be-executed input/output requests according to the count result of the waiting-to-be-executed input-output request counting means when a duplexed file is opened; An input/output load distribution method comprising: input/output control means for controlling output means.