JP2002230940A - DVD-RAM backup server, system and program - Google Patents

Abstract

(57) [Summary] The present invention reduces the time required to refer to backup data stored in a DVD-RAM medium, and improves the performance of accessing backup data stored in a DVD-RAM medium. A backup server 101 sends a DVD library.
In the backup operation to the backup 105, the backup utility 103 reads the backup target data specified by the user from the HDD 104, and reads the backup target data from the DVD-RAM
Write to ~ 110. DVD-RAM management information is stored at the head of the DVD-RAM medium # 1 (106), and backup data is stored after that. Catalog information for identifying the type of backup data stored in each of the DVD-RAM media 106 to 110 is usually stored at the end of the backup data, and is stored in the DVD-RAM management information area. , The access time to the backup data is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving data reference performance from a DVD-RAM medium, and more particularly, to a method for storing backup data on a plurality of DVD-RAM media. The present invention relates to a system for referring to catalog information stored in a DVD-RAM medium without exchanging a file.

[0002]

2. Description of the Related Art Conventionally, in a backup system to DVD-RAM, according to the MTF (Microsoft Tape Format) format,
Catalog information is stored at the end of all backup data. The catalog information stores information for identifying what kind of backup data is stored in the DVD-RAM medium. When referring to data backed up to a DVD-RAM medium, it is necessary to access catalog information stored at the end of all backup data. If the backup data spans two or more DVD-RAM media, use a DVD-R
I had to exchange AM media once and refer to catalog information. Japanese Patent Application Laid-Open No. 2000-20247 describes a technique for improving access efficiency to data backed up by using a virtual tape volume and attributes.

[0003]

However, in the above conventional technique, a backup server (on a host computer)
Requires a virtual storage area, and when catalog information is referred to immediately after backup, the access time cannot be reduced.

As described above, when catalog information is stored at the end of all backup data, when referring to data backed up on a DVD-RAM medium, the catalog information at the end of all backup data must be referred to. There is a problem that it is necessary to secure a necessary storage area in the backup server.

An object of the present invention is to solve the problems of the prior art, shorten the reference time of catalog information stored on a DVD-RAM medium, and improve the convenience of a backup system.

[0006]

In order to achieve the above object, catalog information is stored in a catalog information storage area prepared in a head DVD-RAM management information area of a DVD-RAM medium # 1 before backup is completed. Create a program to do.

Next, when a catalog information reference request is received, it is determined whether catalog information exists in the DVD-RAM management information. If the catalog information exists in the DVD-RAM management information, the catalog information stored at the head of the DVD-RAM medium is referred to instead of referring to the catalog information at the end of the DVD-RAM backed-up data. At this time, even if the backup data extends over two or more DVD-RAM media, a program that does not exchange DVD-RAM media is created because the catalog information is read from DVD-RAM media # 1.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram showing a configuration of a management information storage system according to an embodiment of the present invention. In FIG. 1, reference numeral 101 denotes a backup server that performs data backup, 102 denotes a volatile memory connected to the backup server 101, 103 denotes a backup utility that operates on the backup server 101, and 104 denotes an HDD that is connected to the backup server 101. And the data to be backed up is stored. A DVD library device 105 connected to the backup server 101 is a data backup destination. The DVDs 106 to 110 exist in the DVD library device 105.
RAM media (# 1 to # 5). Although not shown, a processing device such as a CPU is provided in the backup server 101, and the backup utility 103 is executed by this control measure.

Next, the backup operation from the backup server to the DVD library will be described. The backup utility 103 reads the backup target data specified by the user from the HDD 104, and reads the DVD-RAM of the DVD library 105 specified as the backup destination.
Write to media 106-110. The DVD-RAM media 106 to 110 existing in the DVD library are all formatted for backup, and write data from the beginning of the DVD-RAM media # 1 106. However, DVD-RAM media #
DVD-RAM management information is stored at the beginning of 1106, and backup data is stored after that. DVD-RAM media #
If the EOT (End Of Tape) of 1 has been reached, the writing process to the DVD-RAM medium # 2 107 is continued. When data is written to DVD-RAM media # 5 110 EOT, DVD-RA
Replace the M media 106 to 110 and continue backup.

FIG. 2 is a diagram for explaining an operation of storing catalog information when a backup is performed on a DVD-RAM medium. In FIG. 2, when the backup of the actual backup data (data part) is completed, a catalog information storage request (202) is issued from the backup utility. Upon receiving the catalog information storage request (202), store the catalog information after the backup data (203),
At the same time, the catalog information is temporarily stored in the memory 102 (204). When the backup utility reports the completion of the catalog information storage request (205), the backup utility requests the media to be rewound (206).
Issue Determines whether the backup data spans multiple DVD-RAM media (207), and if so, replaces it with the first DVD-RAM media # 1 (208)
I do. The catalog information temporarily stored in the memory can be
It is stored (209) in the catalog information storage area in the DVD-RAM management information in the M medium # 1. The completion is reported (210) in response to the media rewind request from the backup utility.

FIG. 5 shows the data structure of the medium in which the catalog information is stored as described above. Fig. 5 shows that all backup data is DVD-RAM media # 1 and DVD-RAM media # 2
3 shows the structure of management information and backup data in the DVD-RAM medium when stored in the DVD-RAM.

In FIG. 5, reference numeral 501 denotes DVD-RAM media management information. 502 and 509 are catalog information of the backed up data. The catalog information 502 exists in the DVD-RAM management information area, and the catalog information 509 is included in the backup data. All backup data 506 is DVD-RAM media # 1
511 and DVD-RAM media # 2 512.

FIG. 3 is a diagram for explaining an operation of referring to catalog information when referring to what kind of backup data is stored in a DVD-RAM medium.
In FIG. 3, when a catalog information reference request (302) is issued from the backup utility, it is determined (303) whether catalog information exists in the DVD-RAM management information. DVD
-If catalog information exists in RAM management information, DVD-
The catalog information in the RAM management information is read (304). DVD-
If the catalog information does not exist in the RAM management information, the catalog information existing at the end of all the backup data is read (305).

In the example shown in FIG. 5, the current media # 1 (5
When a catalog information reference request is issued when (11) is installed (302), it is determined whether or not catalog information exists in the DVD-RAM management information (303). Media♯
Since the catalog information (502) is included in the DVD-RAM management information (501) of No. 1 (511), this is referred to.

As described above, even when the backup data is stored over a plurality of media, the catalog information is stored in each medium. There is no need to perform a reading process, and it is possible to reduce the time for referring to the backup data.

In this embodiment, the DVD-RAM # 1
Although the description has been made of the case where the data is over the DVD-RAM # 2, the same applies to the case where the data is spread over three or more media. That is, after the catalog information is stored at the end of the backup data, the DV of each medium storing the other part of the backup data is stored.
Catalog information can be stored in the D-RAM management information. In this case, for example, when reading the portion of the second medium out of the backup data over three media, even if a catalog information reference request is issued, the medium is not replaced, and It is possible to refer to the catalog information of the backup data.

In this embodiment, the catalog information to be stored in each DVD-RAM management information is stored in the memory of the backup server, but may be stored in the HDD connected to the backup server. The good thing goes without saying.

Further, in the present embodiment, when information is stored over a plurality of media, the catalog information is stored in the DVD-RAM management information. May store the catalog information.

FIG. 4 shows the structure of management information and backup data in the DVD-RAM medium when all the backup data is stored in the DVD-RAM medium # 1. In the figure, reference numeral 401 denotes DVD-RAM media management information in which backup data position information and format information in the DVD-RAM medium are stored. 402 and 406 are catalog information of the backed up data. The catalog information 402 exists in the DVD-RAM management information area, and the catalog information 406 is included in the backup data. The all backup data 408 includes a start mark 403 indicating the beginning of all backup data, an actual backup data (data portion) 404, an end mark 405 indicating the end of all backup data, and catalog information 406 indicating information of backed up data. Is included.

As described above, even when the backup data does not extend over a plurality of media, the DVD-RAM
If catalog information is stored in the management information area,
Since it is not necessary to perform the process of searching the catalog information from the end mark of the backup data, the reference time of the catalog information can be further reduced.

[0022]

According to the present invention, particularly when backup data is stored in a plurality of DVD-RAM media,
It is possible to refer to the catalog information stored in the DVD-RAM medium without performing the process of changing the DVD-RAM medium.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of a configuration of a system device of the present invention.

FIG. 2 is a diagram showing an embodiment of a flow of catalog information storage at the time of backup execution according to the present invention.

FIG. 3 is a diagram showing an embodiment of a flow when referring to a catalog according to the present invention.

FIG. 4 is a diagram showing an embodiment of the data structure of management information and backup data according to the present invention.

FIG. 5 is a diagram showing an example of a data structure of management information and backup data according to the present invention.

[Explanation of symbols]

Reference Signs List 101 backup server 102 memory 103 backup utility 104 HDD 105 DVD library 106 to 110 DVD-RAM media 201 start of catalog information storage processing at backup 202 catalog information storage request 203 catalog information storage processing 204 temporarily store catalog information in memory Processing 205 Notification of catalog information storage request completion 206 Media rewind request 207 Media span determination processing 208 Media exchange processing 209 Processing of storing catalog information in memory to DVD-RAM management information storage area 210 Media rewind request completion notification 211 During backup End of catalog information storage processing 301 Catalog information reference processing start 302 Catalog information reference request 303 Judgment processing whether catalog information exists in DVD-RAM management information 304 Catalog information reading processing in DVD-RAM management information 305 Catalog information reading processing in backup data 306 Catalog information reference processing end 401 DVD-RAM media management information 402 Catalog information (in DVD-RAM management information area) 403 Top mark 404 Backup data 405 End mark 406 Catalog information (within all backup data) 407 DVD-RAM management information area 408 All backup data 501 DVD-RAM media management information 502 Catalog information (within DVD-RAM management information area) 503 First mark 504, 7 Actual backup data (data part) 505 DVD-RAM management information area 506, 510 All backup data 508 End mark 509 Catalog information (within all backup data) 511 DVD-RAM media # 1 512 DVD-RAM media # 2

Continued on the front page (72) Inventor Kazutoshi Kato 810 Shimoimaizumi, Ebina-shi, Kanagawa F-term in the Internet Platform Division of Hitachi, Ltd. 5B082 CA17 EA01 5D110 AA17 DA08 DA11 DA14 DB03 DC05 DC16

Claims (4)

[Claims] 1. A backup server for storing data on a plurality of DVD-RAMs, wherein a first storage area for storing backup data stored on the DVD-RAM and the backup data are stored on the DVD-RAM. A processing device; and a second storage area for storing catalog information of the backup data stored in the DVD-RAM, wherein the backup data is stored in a plurality of DVD-Rs.
When the backup data is divided and stored, the control device controls the DVD-R storing the last part of the backup data.
A backup server storing catalog information of the backup data in a DVD-RAM different from the AM. 2. A DVD-R having a plurality of DVD-RAMs.
In a backup system including an AM library and a backup server that stores data in the DVD-RAM, the backup server includes the DVD-R
A first storage area for storing backup data stored in the AM, and storing the backup data in the DVD-R;
And a second storage area for storing catalog information of the backup data stored in the DVD-RAM, wherein the backup data is stored in a plurality of D-RAMs.
When the data is divided and stored in the VD-RAM, the control device determines whether the last part of the backup data is stored in the D-RAM.
A backup system, wherein catalog information of the backup data is stored in a DVD-RAM different from a VD-RAM. 3. A DVD-R having a plurality of DVD-RAMs
Determining whether the data backed up in the AM library is divided and stored in the plurality of DVD-RAMs; storing catalog information on the backed up data in a storage device; When the data that has been backed up is divided and stored, the D
Storing the catalog information in a DVD-RAM different from the VD-RAM. 4. A DVD-R having a plurality of DVD-RAMs
Judging whether the data backed up in the AM library is divided and stored in the plurality of DVD-RAMs, and, if the backed up data is divided and stored, the backup data DVD-RAM different from the DVD-RAM storing the final
Reading the catalog information stored in the RAM.