JPH03237524A - Ras processor - Google Patents

Abstract

PURPOSE:To automatically retry an access or perform double write by storing a file attribute and selecting an I/O path to a proper disk device in accordance with the attribute at the time of accessing a file. CONSTITUTION:RAS processors 10 and 11 are provided with a file information storage means 9. When I/O error occurs on the I/O path to a disk device 12 selected by an I/O issuing path selecting means 3 at the time of read require ment from the RAS processor 10 to a shared file the I/O path to the dish device 13 is selected with a 2nd path selecting means for retry the retry is executed. Unless I/O error occurs on the I/O path to the disk device 12 selected by the I/O issuing path selecting means 3 at the time of a WR/TE requirement from the RAS processor 10 to the shard file, the I/O path to the disk device 13 is selected by the second path selecting means for double write to perform double write.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a RAS processor system, and in particular, a RAS processor system having a plurality of systems shares a disk existing in each system, and stores information regarding the entire system on the disk. RA that manages a mixture of the first file that stores information and the second file that stores information that is independent for each system.
This invention relates to a disk access method for an S processor.

[Conventional technology]

Conventionally, in this type of system, there is usually a RAS processor for each system, and each RAS processor has its own disk.

For RAS control by a RAS processor, it is necessary to manage a mixture of information regarding the entire system and information independent of each system, and a disk for storing this information is shared by a plurality of RAS processors.

In this case, the input/output method and the error recovery method when an I/O error occurs differ depending on whether the file is related to the entire system or is independent for each system.

In particular, in the case of a shared file, WRITE requires double writing, and READ requires retrying using an alternative path when an I/O error occurs.

[Problem to be solved by the invention]

In the conventional disk access method described above, the input/output method and the error recovery method when an I/O error occurs differ depending on whether the file is related to the entire system or is an independent file for each system. The disadvantage is that all of this must be done by the input/output request source that recognizes the file attributes.

[Means to solve the problem]

The configuration of the RAS processor of the present invention is such that a disk existing in each system of a RAS processor system having a plurality of systems is shared, and the disk stores a first file that stores information regarding the entire system and information that is independent for each system. Second to do
In a RAS processor that manages a mixture of files, when accessing a file, an I/O parameter including the file name of the file, a relative address from the base within the file, and an I/O command indicating whether it is input or output. A file information storage that specifies a file name for each file, a file attribute indicating whether the file is the first file or the second file, and address information of a base address and an end address of each file in correspondence with the file. channel program creation means for searching the file information storage means using the file name and relative address of the I/O parameter and the command/O command and creating a channel program from the searched file information; From the file information provided, if it is the first file, select the ■/○ issue path to the disk of the own system, and if it is the second file, select the I/O issue path to the disk according to the file attributes. a first I/O issuing path selection means; and the I/O to which the created channel program is selected.
A first ■/○ issuing means that issues I/O using the issuing path, and when the I/O ends, determines whether it is the first file or the second file from the retrieved file information, and If the input is in file 1, determine if it is an I/O error, and
/O error, an I/O issuance path other than the I/O issuance path selected by the first I/O issuance path selection means is selected for recovery from the I/O error, and an I/O issuance path is selected for output. O
a second I/O issuance path selection means for selecting an I/O issuance path for double writing other than the I/O issuance path selected by the first I/O issuance path selection means if there is no error; It is characterized by including a second ■/○ issuing means for issuing I/O using the selected I/O issuing path.

〔Example〕

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

FIG. 1 is a block diagram showing the main part configuration of an embodiment of the RAS processor of the present invention, FIG. 2 is a block diagram showing the configuration of the RAS processor and the disk device, and FIG. 3 is the file information storage means in FIG. 1. FIG. 4 is a processing flow diagram of the shared file I/O terminating means 7 and the second I/O issuing means 8 in FIG. 1.

The RAS processor system in this embodiment consists of two systems as shown in FIG. 2, and includes two RAS processors/O. 11 and two disk devices 12 and 13, both disks can be accessed by both RAS processors.

Here, the RAS processor 1o and the disk device 12 are
The RAS processor 11 and the disk device 13 control the RAS function of the first system.

In FIG. 1, the RAS processor includes I/O parameter checking means 1, channel program creation means 2,
I/O issuing path selection means 3 and first I/O issuing means 4
, I/O termination processing selection means 5, system-specific file I/O
The termination means 6, the shared file ■/○ termination means 7, and the second
It has a ■/○ issuing means 8 and a file information storage means 9.

In FIG. 3, the file information storage means 9 stores information consisting of a file name 20, a file attribute 21, a file base 22, and a file end 23 for each file. It indicates whether it is a system individual file, a 1 system individual file, or a 0/1 system shared file.

In FIG. 4, the processes of the shared file I/O terminating means 7 and the second I/O issuing means 8 after the I/O in FIG.
I/O error determination processing 32, retry second path selection processing 33, second I/O issue processing 34, and WRI
I/O error determination processing 35 during TE and second
It consists of a path selection process 36.

Next, the operation of this embodiment will be explained.

When there is an input/output request from a RAS processor, the RAS processor that is the source of the input/output request specifies a file name, relative address, and I/O command and makes the input/output request.

Subsequently, the I/O parameter check means 1 searches the file information storage means 9 for the corresponding file name, and
The normality of the O parameters is checked, and the channel program creation means 2 creates a channel program.

The I/O issuing path selection means 3 selects an I/O path to the O system if it is a 0 system individual file, and an I/O path to the 1 system if it is a 1 system individual file, based on the file attributes of the retrieved file information.
If the /O path is a 0/1 system shared file, it is the I to the own system.
/O Select path.

The first I/O issuing means 4 issues an I/O on the selected I/O path.
Issue /O.

When the issued Ilo is completed, the I/O termination processing selection means 5 activates either the system-based file I/O termination means 6 or the shared file I/O termination means 7.

In the case of a shared file, as shown in Figure 4, first,
It is determined whether it is READ or WRITE (31), and the REA
If it is D, determine whether an I/O error has occurred32), and if it is an error, select an I/O path other than the I/O path that caused the error33>, and select the I/O path for retry.
Issue O (34).

If it is WRITE, determine whether it is an I/O error or not (35), and if it is not an error, write the I/O to the other disk.
/O path is selected (36) and I/O is issued for double writing (34).

Here, when there is a READ request from the 0-system RAS processor/O to a shared file, the input/output request source includes the file name indicating the shared file, the relative address, and the READ request.
I/O requests are made using I/O commands, but I/O
When a ■/○ error occurs in the I/O path to the disk device 12 selected by the issuing path selection means 3, the I/O path to the disk device 13 is selected by the second path selection means 33 for retry and retry is performed. will be held.

Additionally, when there is a WRl or TE request to a shared file from the O-system RAS processor 1o, the input/output request source makes the input/output request using the file name and relative address indicating the shared file and the WRITE I/O command. is to the disk device 12 selected by the I/O issuing path selection means 3.
If no I/O error occurs in the /○ path, the second path selection means 36 for double writing selects the I/O to the disk device 13.
/O path is selected and double writing is performed.

On the other hand, if there is an input/output request from RAS processor E1 of system 1 to an individual file of system ○, the source of the input/output request must include the file name indicating the individual file of system O, the relative address, and the RE
An input/output request is made using the AD or WRITE I/O command, but even if a ■/○ error occurs on the I/O path to the disk device 12 selected by the ■/○ issuing path selection means 3, the I/O issuance is not performed in two passes.

Although an example of a system with two O/1 systems has been shown here, it is clear that a system with three or more systems can be realized using the same method.

〔Effect of the invention〕

As explained above, the present invention stores file attributes indicating whether the file is related to the information of the entire system or the information of each system, corresponding to the file existing in the disk. , When accessing a file, select the appropriate I/O path to the disk device according to the file attribute, and also try using an alternative path in case of a READ error.
This has the effect that double writing in the case of TE is automatically performed without requiring any processing by the input/output request source.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the main part configuration of an embodiment of the RAS processor of the present invention, FIG. 2 is a block diagram showing the configuration of the RAS processor and the disk device, and FIG. 3 is the file information storage means in FIG. 1. FIG. 4 is a processing flow diagram of the shared file I/O terminating means 7 and the second I/O issuing means 8 in FIG. 1. DESCRIPTION OF SYMBOLS 1... I/O parameter check means, 2... Channel program creation means, 3... I/O issue path selection means, 4... First I/O issue means, 5... I /O
End processing selection means, 6... System-specific file I/O end means, 7... Shared file I/O end means, 8... Second I/O issuing means, 9... File information storage. means,
/O. 11...RAS processor, 12.13...
Disk device, 20...File name, 21...File attribute, 22...File base, 23...File end, 31...READ/WRITE determination processing, 32.35...I/O Error determination processing, 33...
Second path selection process for retry, 34...second I/O
Issuance processing, 36... Second pass selection processing for double writing.

Claims (1)

[Claims] A disk existing in each system of a RAS processor system having a plurality of systems is shared, and a first file that stores information regarding the entire system and a second file that stores information independent for each system are mixed on the disk. R to manage
In the AS processor, when accessing a file, I/O parameters including the file name of the file, a relative address from the base within the file, and an I/O command indicating whether it is input or output are specified, and the file name of each file is specified. a file information storage means that stores file attributes indicating whether the file is the first file or the second file, and address information of a base address and an end address of each file in correspondence with the files; channel program creation means for searching the file information storage means using a file name, relative address and I/O command and creating a channel program from the retrieved file information; and a channel program creation means for creating a channel program from the retrieved file information; If it is a second file, select the I/O issue path to the disk of the own system, and if it is the second file, select the I/O issue path to the disk according to the file attribute.The first I/O issue path selection means, a first I/O issuing means for issuing I/O using the created channel program using the selected I/O issuing path; and upon completion of the I/O, the retrieved file It determines whether it is the first file or the second file from the information, and if it is input in the first file, it determines whether it is an I/O error, and if it is an I/O error, the first I/O
I/O issuance path other than the I/O issuance path selected by the issuance path selection means
Select an I/O issue path for O error recovery, and if there is no I/O error in output, double write is performed on an I/O issue path other than the one selected by the first I/O issue path selection means. a second I/O issuance path selecting means for selecting an I/O issuance path that performs I/O issuance;
A RAS processor comprising: second I/O issuing means for issuing /O.