JP2003271319A - Backup system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for executing the sampling of backup in a backup medium without providing any backup time during a system operation. <P>SOLUTION: A program for copying an input and output request to an external storage device and a converting program having the identifier of a backup medium and an instruction conversion table are set in a central arithmetic processing unit, and the copied input/output request is converted into an input/ output to the backup medium by the conversion program so that the input/ output can be executed. Therefore, it is possible to simultaneously execute the input/output to the external storage device and the copy to the backup medium. Thus, it is possible to simultaneously execute the input/output of the external storage device and the sampling of backup during the system operation. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and system for enabling a backup copy of an external storage device accessed in a data processing system to be performed on a separate storage device. Further, the present invention relates to a method and system for storing the same data in an external storage device and a different type storage device without being limited to a backup copy.

[0002]

2. Description of the Related Art In recent database systems, the time required for backup copy increases as the amount of data increases, and applications that require data updates and static data that has not been updated when the system cannot be stopped. There has been a need for a means of simultaneously performing backup copies that require the.

In response to the above request, Japanese Patent Laid-Open No. 11-327.
In the method disclosed in Japanese Patent No. 986, it is determined whether the input / output request issuer is a request for static data, and the input / output target device is changed depending on whether the request is for static data, thereby executing an application involving data update. Teaches a method of securing backup time and executing an application accompanied by data update and a backup copy at the same time.

[0004]

[Patent Document 1] Japanese Patent Laid-Open No. 11-3279
In the method disclosed in Japanese Patent Publication No. 86, one of the devices created by the copy function is used for backup copy, so it is necessary to secure time to execute the backup copy. I couldn't.

Therefore, it is an object of the present invention to perform a normal input / output and a backup copy at the same time, thereby enabling a backup copy that does not require a backup copy time.

[0006]

A conversion program having a program for copying an input / output request to an external storage device and a backup medium identifier and an instruction conversion table is provided in the central processing unit, or the input / output is controlled. By providing a copy function and a conversion function in the control device that performs the input / output by converting the input / output request copied by the copy program or the copy function into the input / output request to the backup medium by the conversion program or the conversion function, It enables input / output to / from an external storage device and backup copy to a backup medium at the same time.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a system according to an embodiment of the present invention. In FIG. 1, 100 is a central processing unit for executing various programs, 101 is an application operating in the central processing unit 1, An input / output program 102 operates in the central processing unit 1. Further, the central processing unit 1 includes a magnetic disk unit 108 controlled by the control unit 106, and a control unit 1
A magnetic tape device 112 controlled by 10 and a DAT device 116 controlled by a control device 114 are connected, and the central processing unit 1, the control device 106, the control device 110, and the control device 114 are connected to the path 105 and the path, respectively. Connected by 109 and path 113,
The magnetic disk device 108 and the control device 106 have a path 107.
, The magnetic tape device 112 and the control device 110 are connected by a path 111, and the DAT device 116 and the control device 1 are connected.
14 are connected by a path 115. Further, a copy program 103 for creating a copy of the input / output request in the input / output program 102, and an input / output request to the magnetic disk device 108 are sent to the magnetic tape device 112 and the DAT device 116.
There is a conversion program 104 for converting the data into data suitable for. The conversion program 104 does not always need to operate, and may operate only when input / output to / from the magnetic tape device 112 or the DAT device 116 is necessary. Also,
The copy program 103 includes a copy control unit 120 that controls copying and a synchronization control unit 121 that controls synchronization of copied input / output requests. Further, the conversion program 104 has a selection control unit 118 that selects a conversion destination device, a conversion control unit 119 that controls conversion, and a conversion table 117 that stores information about the conversion destination device.

FIG. 2 shows information stored in the conversion table 117. The conversion table 117 has a device conversion table 201 and an instruction conversion table 210 shown in FIG. The device conversion table 201 has a device type 202 of the conversion destination, a unique identifier 203 for each device, and a flag 204 indicating the necessity of conversion. The instruction conversion table 210 is identifier 2
It exists for every 03, and has a storage area 211 of the identifier 203, a command type 212 such as reading and updating, and a command code 213 after the device. The conversion destination device type 202 may be a name such as a magnetic tape or a CD-R, or may be a unique identifier for each device type. When a unique identifier is stored for each device, 202 and 203 may have the same content, or only the instruction conversion table 210 may be provided without the device conversion table 201. The flag 204 may be switched ON / OFF by an external command operation or switch operation, or may be always ON. Also,
There may be a plurality of instruction conversion tables corresponding to a plurality of device types as shown in the example of FIG.

FIG. 3 shows a concrete example of the conversion table 117. The conversion table 117 has a device conversion table 300 and an instruction conversion table 310 shown in FIG. In the device conversion table 300, “01” is set as the magnetic tape device name 301 and the magnetic tape device identifier 302, and “02” is set as the CD-R device name 304 and the CD-R device identifier 305.
, And has “03” as the DAT device name 307 and the DAT device identifier 308. As for the conversion necessity flag, when the magnetic tape device flag 303 and the DAT device flag 309 are ON,
The CD-R device flag 306 is OFF. The command conversion table 310 exists corresponding to the device identifier 303 and the device identifier 305, and the command conversion table 310 for the device identifier 03 has a device identifier 311 and command types 312-31.
4 and instruction codes 315 to 317 corresponding to the instruction type. Command conversion table 320 for device identifier 305
Includes a device identifier 321, instruction types 322 to 324,
It has instruction codes 325 to 327 corresponding to the instruction type. In the example of FIG. 3, as the instruction code corresponding to the instruction types of “read”, “update”, and “control”, “10”, “20”, and “30” in the case of the magnetic tape device identifier 311,
In the case of the T device identifier 321, "40", "50", and "60"
Have respectively.

FIG. 4 shows the embodiment of FIGS. 1 and 3.
At the same time that the application 101 makes an update request to the magnetic disk device 108, the magnetic tape device 112 and the DAT
7 is an operation flowchart in the case of simultaneously updating the devices 116. The application 101 is the magnetic disk device 1
When the update of 08 is executed (step 401), it is checked whether the conversion program 104 is operating (step 402). If the conversion program 104 is running,
The copy program 103 creates a copy of the input / output request and passes it to the conversion program 104 (step 403). The conversion program 104 determines whether the device name is stored in the device conversion table 300 and conversion is necessary (flag = ON) (step 404). In the present embodiment, "magnetic tape", "CD-R", and "DAT" are stored as device names, and flags "ON" for "magnetic tape" and "DAT".
Therefore, the conversion process is performed on the "magnetic tape" and "DAT". The conversion process for the magnetic tape is step 405.
~ 410. First, the device name "magnetic tape" is acquired from the device name 301 (step 405), and the device identifier "01" is acquired from the device identifier 302 (step 4).
06). Next, the instruction conversion table 310 having the device identifier “01” is acquired (step 407), and the instruction code “20” corresponding to the instruction type “update” is given as the instruction code 316.
(Step 408). The acquired instruction code "20" is passed to the input / output program 102 to request the update of the magnetic tape device 112 (step 409). The input / output program 102 updates the magnetic tape device 112 via the path 109, the control device 110, and the path 111 (step 410). The same processing as in steps 405 to 410 is also performed for DAT (steps 411 to 416). If the conversion program 104 is not operating in step 402 or if there is no conversion-requiring device in step 404 (when the processes have been completed for all devices), the magnetic disk device 108 is updated and the process is completed (step Four
17).

FIG. 5 shows the flow from the start to the completion of the input / output request from the application in the present invention. Figure 5
5, a central processing unit 500 executes various programs, 501 is an application operating in the central processing unit 500, and 502 is a central processing unit 500.
It is an input / output program that operates within. A magnetic disk device 508 controlled by the control device 506 and a magnetic tape device 512 controlled by the control device 510 are connected to the central processing unit 500, and the central processing unit 500, the control device 506, and the control device are controlled. Device 5
10 are connected by a path 505 and a path 509, respectively, and the magnetic disk device 508 and the control device 506 are connected by the path 5
07, the magnetic tape device 512 and the control device 51
0 is connected by a path 511. Further, the input / output program 502 includes a copy program 503 for making a copy of the input / output request and a conversion program 504 for converting the input / output request to the magnetic disk device 508 into data suitable for the magnetic tape device 512. Application 501
The I / O request from the I / O program is accepted by the I / O program 502 and passed to the copy program 503 (520). The I / O request passed to the copy program 503 is copied (521) and passed to the conversion program 504 (52).
3). The input / output request of the copy source executes input / output of the magnetic disk device 508 (522). The I / O request passed to the conversion program 504 is converted into an I / O request of the magnetic tape device 512 by the conversion function by selecting the conversion destination device in the conversion program 504 (524) (525, 52).
6) The input / output of the backup medium 112 is executed (527). I / O completion of magnetic disk unit 508 (5
30) and the input / output of the magnetic tape device 512 is completed (528).
Are synchronized in the copy program 503 (52
9), the input / output completion is reported to the application 501 (531).

FIG. 6 is an operation flowchart of FIG.
In FIG. 6, when an update request for the magnetic disk device 508 is issued from the application 501 (step 60).
1) First, it is checked whether or not the copy program 503 is operating (step 602). Copy program 5
If 03 is operating, a copy of the input / output request is created and passed to the conversion program 504 (step 603). The conversion program 504 converts the passed input / output request into data suitable for the magnetic disk device 512 (step 604).
Next, the input / output program 502 passes the converted data to the control device 510 to update the magnetic tape device 512 (step 605). When the copy program 503 is not operating in step 602 or after the magnetic tape device 512 is updated in step 605, an input / output request is passed to the control device 506 to update the magnetic disk device 508 (step 606). The copy program 503 controls the synchronization of the I / O completion of the magnetic disk device 508 and the magnetic tape device 512 (step 607), and reports the I / O completion to the application 501 if both of the I / O have been completed (step 608). .

Next, FIG. 7 shows an embodiment of a method for realizing the processing shown in FIG. 1 by using hardware. In FIG. 7, 700 is a central processing unit that executes various programs, 701 is an application that runs in the central processing unit 700, and 702 is an input / output program that runs in the central processing unit 700. The control device 704 is a device that controls an input / output request from the central processing unit 700, the central processing unit 700 and the control device 704 are connected via a path 703, and the path 70 is connected to the control device 704.
The magnetic disk device 706 is connected via the No. 5.
A copy device 707 and a conversion device 714 are included in the control device 704.
Exists. Further, the control device 710 is connected to the control device 704 via a path 709, and the magnetic tape device 712 is connected to the control device 710 via a path 711. The copying device 707 is a device for copying an input / output request to the magnetic disk device 706, and the conversion device 708 is a device for converting the input / output request copied by the copying device 707 into data suitable for the magnetic tape device 710. The copying apparatus 307 and the conversion apparatus 308 do not need to be always connected, and may be connected only when input / output of the backup medium 310 is necessary. In addition, the control device 704
The copy control unit 713 has a synchronization control unit 713 for controlling the synchronization of input / output completion, and the copy control unit 708 has a copy device 707. Further, the conversion device 714 has a conversion control unit 715 and a conversion table 716. Here, the conversion table 71
6 stores the information of the conversion table shown in FIG.

FIG. 8 shows the flow from the start to the completion of the input / output request from the application in FIG. In FIG. 8, reference numeral 800 is a central processing unit that executes various programs, 801 is an application that runs in the central processing unit 800, and 802 is an input / output program that runs in the central processing unit 800. The control device 804 is a device that controls an input / output request from the central processing unit 800, and the central processing unit 800 is controlled via the path 803.
And a control device 804 are connected to the control device 804, and a magnetic disk device 806 is connected to the control device 804 via a path 805. In the control device 804, a copying device 807 and a conversion device 8 are provided.
08 is present. Further, the control device 810 passes the path 809.
A magnetic tape device 812 is connected to the control device 810 via a path 811. Flows from the start to the completion of the input / output request from the application 801 are shown at 820 to 829. The input / output request from the application 801 is accepted by the control device 804 by the input / output program 802 and passed to the copying device 807 (820). The input / output request passed to the copying apparatus 807 is copied (821), and the conversion apparatus 808
(822). The input / output request of the copy source executes the input / output of the magnetic disk device 806 (826). The input / output request passed to the conversion device 808 is converted into the input / output request of the magnetic tape device 812 in the conversion device 808 (82
3), input / output of the magnetic tape device 812 is executed (8
24). Input / output completion of the magnetic disk device 806 (82
7) and the input / output of the magnetic tape device 825 is completed (825)
Are synchronized within the controller 304 (828), I / O completion is reported to the central processing unit 800 and to the application 801 (829).

FIG. 9 is an operation flowchart of FIG.
In FIG. 9, when an update request for the magnetic disk device 806 is issued from the application 801 (step 90
1), the input / output program 802 requests the controller 804 to update the magnetic disk device 806 (step 90).
2). Next, the control device 804 determines whether the copying device 807 and the conversion device 808 are connected (step 903), and if they are connected, the copying device 807 creates a copy of the input / output request (step 904). , Conversion device 80
8 converts the copied input / output request into data suitable for the magnetic tape device 812 (step 905), and updates the magnetic tape device 812 using the converted data (step 906). When the update of the backup medium 812 is completed, or in step 903, the copying apparatus 807 and the conversion apparatus 8 are updated.
When it is determined that 08 is not connected, the magnetic disk device 806 is updated (step 907). When the update is completed, the completion of input / output is notified to the central processing unit 800 (step 908).

[0017]

According to the present invention, it is possible to take a backup without providing a special time during system operation.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a system according to an embodiment of the present invention.

FIG. 2 is a conversion table used by a conversion program or a conversion device according to the present invention.

FIG. 3 is an example of a conversion table used by a conversion program or a conversion device according to the present invention.

FIG. 4 is a flow chart for implementing the present invention in the system of FIG.

5 is a flow chart of an input / output request in the system of FIG.

FIG. 6 is an operation flowchart of FIG.

FIG. 7 is a configuration diagram of a system in an embodiment using a hardware mechanism in the present invention.

8 is a flow chart of an input / output request in the system of FIG.

9 is a flowchart for implementing the present invention in the system of FIG.

[Explanation of symbols]

Reference numeral 100 ... Central processing unit, 101 ... Application, 102 ... Input / output program, 103 ... Copy program, 104 ... Conversion program, 105 ... Path, 106 ...
Control device, 107 ... Path, 108 ... Magnetic disk device,
109 ... Path, 110 ... Control device, 111 ... Path, 1
12 ... Magnetic tape device, 113 ... Path, 114 ... Control device, 115 ... Path, 116 ... DAT device, 117 ... Conversion table in conversion program, 118 ... Selection control unit in conversion program, 119 ... Conversion in conversion program Control unit, 120 ... Copy control unit in copy program, 121 ...
Synchronous control unit in the copy program.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masamichi Okamine             5030 Totsuka Town, Totsuka Ward, Yokohama City, Kanagawa Prefecture             Ceremony company Hitachi Ltd. software division (72) Inventor Kenichi Oyamada             5030 Totsuka Town, Totsuka Ward, Yokohama City, Kanagawa Prefecture             Ceremony company Hitachi Ltd. software division (72) Inventor Yoshiaki Shinmura             5030 Totsuka Town, Totsuka Ward, Yokohama City, Kanagawa Prefecture             Ceremony company Hitachi Ltd. software division F term (reference) 5B065 EA35                 5B082 DA02

Claims (4)

[Claims] 1. A system having an external storage device and a central processing unit for instructing a data input / output request to a control device for controlling an input / output request of the external storage device, wherein the input / output to / from the external storage device is performed. By adding in the central processing unit a copy function for creating a copy of a request and a conversion function for converting an input / output request to the external storage device into an input / output request to another type of external storage device, the external storage A system characterized by executing an input / output request generated by the copying function to an external storage device of a different type at the same time as an input / output request to a device. 2. A system having an external storage device and a central processing unit for instructing a data input / output request to a control device for controlling an input / output request of the external storage device, wherein an external unit from the central processing unit is provided. A conversion function for copying an input / output request to a storage device to an input / output request to an external storage device of a different type is added to the control device to generate the input / output request to the external storage device and the copy function at the same time. A system characterized by executing the input / output request to another type of external storage device. 3. In the above system, by having a conversion table for each device type and each device type in the conversion function, the conversion function sends an input / output request to the external storage device to another type of external storage device. 3. The system according to claim 1 or 2, which has a conversion function of converting into an input / output request. 4. In the system described above, the copying and converting functions can be instructed by an external operator command operating in the central processing unit or a switch operation added to the control unit, thereby copying. The system according to claim 1 or 2, wherein the necessity of operation of the function and the conversion function can be instructed from the outside.