KR200272309Y1 - Apparatus of DVD Network Data Storage - Google Patents

Abstract

The present invention relates to a DVD network data storage device, which integrates a DVD-RAM module control device and a plurality of DVD-RAM modules into a single system, and mounts a hard disk inside the system, thereby providing a connection between the DVD-RAM module and the hard disk drive. Its purpose is to enable fast access times, stable data storage and real-time multiple access by implementing the cache and mirroring function of the system.

The DVD network data storage device according to the present invention for this purpose is made by integrating the DVD-RAM module and the DVD-RAM module control unit into one system. The DVD-RAM module drives the DVD-RAM disk to store and retrieve data. The DVD-RAM module control apparatus has a hard disk drive that performs a mirroring function for backing up data stored in the DVD-RAM module and a cache function for compensating for the data access speed of the DVD data storage means.

Description

Apparatus of DVD Network Data Storage

The present invention relates to a data storage device, and more particularly, to a network-based DVD network data storage device using a DVD-RAM disk as a storage medium.

As part of the national informatization strategy, the law on public institution records management was enacted in October 1999, raising the interest in the preservation and preservation of various records, and the importance of systematic management of data and retrieval and retrieval. Low cost, high reliability, easy capacity expansion, quick replacement of faulty parts and the development, production and service of high quality application software by our own technology can be promoted at the national level. It also has a great meaning in the information business.

Hard disk drives, magnetic tapes, and CDs, which have been used to store and retrieve new data (characters, images, movies, programs, etc.) constantly created in the information age, have the capacity, price, expansion limits, reliability of data preservation, Due to the limitation of standardization and compatibility, there are many problems in storing and preserving a large amount of information for a long time and retrieving it quickly. In particular, a network-based data storage medium requires an additional server type computer, which incurs additional costs.

1 is a block diagram showing a data storage medium based on a conventional server type computer. As shown in FIG. 1, a client first accesses a storage medium 104 through a server 102, and then accesses a storage medium 104, a peripheral device of the server, to retrieve, retrieve, and store data. Do this. The storage medium 104 is a type of jukebox, which holds a plurality of storage disks, and loads necessary disks into a drive according to a client's request to perform data retrieval, withdrawal, and storage. .

Most jukebox-type storage devices currently in use in Korea depend on 100% import and are very expensive. In addition, due to the structural characteristics of the juke box shape, physical obstacles may occur, but as a result of imports, it is insufficient to secure spare parts, thereby preventing stable service. Therefore, there is a problem that the reliability of the stable storage of data is greatly reduced.

Also, as shown in FIG. 1, in order to use a juke box type data storage medium, a separate computer system must be provided, and the storage medium can be used only when it is always connected as a peripheral device of the computer system. In addition, since the time required to mechanically change disks is relatively slow compared to the operating time of a hard disk drive or the like, there is a problem that it is virtually impossible for multiple users to simultaneously use information stored in a storage medium in real time.

Therefore, the DVD network data storage device according to the present invention integrates a DVD-RAM module control device and a plurality of DVD-RAM modules into a single system, and mounts a hard disk inside the system to provide a connection between the DVD-RAM module and the hard disk drive. Its purpose is to enable fast access times, stable data storage and real-time multiple access by implementing the cache and mirroring function of the system.

The DVD network data storage device according to the present invention for achieving the above object is made by integrating the DVD-RAM module and the DVD-RAM module control unit into one system. The DVD-RAM module drives the DVD-RAM disk to store and retrieve data.

The DVD-RAM module control apparatus has a hard disk drive that performs a mirroring function for backing up data stored in the DVD-RAM module and a cache function for compensating for the data access speed of the DVD data storage means.

1 is a block diagram showing a data storage medium based on a conventional server type computer.

Figure 2 is a block diagram showing a system integration concept of the DVD network data storage device according to the present invention.

Figure 3 is a block diagram showing the configuration of a DVD network data storage device according to the present invention.

Figure 4 is a block diagram showing the configuration of a data processing process of the DVD network data storage device according to the present invention.

5 is a diagram illustrating a data flow in a data read and write operation of a DVD network data storage device according to the present invention;

Figure 6 is a flowchart showing the operation of the DVD network data storage device according to the present invention.

Explanation of symbols on main parts of the drawing

102: server 104: data storage device

202: DVD network data storage device 302: DVD-RAM module control device

304: mainboard

306: central processing unit 308: SCSI controller

310, 408: hard disk drive 312: RS-232C

314: DVD controller 316: DVD drive

318: DVD-RAM tray 320: Client

322, 406: DVD-RAM module 402: server block

404: database 410: write process

412 management process 416 LAN interface

418: user interface block

Hereinafter, a preferred embodiment of a DVD network data storage device according to the present invention will be described with reference to FIGS. 2 to 6.

2 is a block diagram showing a system integration concept of a DVD network data storage device according to the present invention. As shown in Fig. 2, the server type computer and the DVD-RAM module are integrated into one system to allow multiple accesses.

3 is a block diagram showing the configuration of a DVD network data storage device according to the present invention. In the DVD network data storage device 202 according to the present invention, the DVD-RAM module control device 302 and the DVD-RAM module 322 are integrated into one system.

The DVD-RAM module controller 302 may include a main board 304 and a SCSI controller 308, a hard disk drive 310, an RS-232C 312, and a DVD controller 314. And the like. The main board 304 is equipped with a central processing unit, that is, a central processing unit 306. The SCSI controller 308 is an interface for connecting peripheral devices such as the hard disk drive 310 and the DVD drive 316 to the CPU 306. The hard disk drive 310 is to compensate for the slow data read / write speed of the DVD-RAM drive 316. The DVD-RAM drive 316 has a relatively slow driving speed when compared to a hard disk drive. Therefore, when the DVD-RAM drive 316 is driven when accessing data at the request of the client, the waiting time of the client 320 becomes very long. To compensate for this, a hard disk drive 310 having a larger storage capacity than the DVD-RAM module 322 is mounted, and the HDD disk module 310 performs a cache function and a mirroring function. The data stored in the 322 is backed up, and frequently accessed data is stored in the cache of the hard disk drive 310 so that the data can be accessed by the request of the client 320. Performing the first from the cache greatly improves the data access speed and greatly reduces the latency of the client 320. The RS-232C 312 is a serial communication device for communication between the motherboard 304 and the DVD controller 314. The DVD controller 314 controls, in the DVD-RAM module 322, mechanical operations such as loading the DVD-RAM disk into the DVD drive 316. The client 320 communicates with the DVD-RAM module control device 302 via a LAN interface.

The DVD-RAM module 322 includes a DVD drive 316 and a DVD-RAM tray 318. The DVD drive 316 drives the DVD-RAM disk to read or write data. Additional mounting of the DVD-RAM module including the DVD drive 316 and the DVD-RAM tray 318 may further expand the storage capacity. The DVD-RAM tray 318 holds and operates a plurality of DVD-RAM disks. The DVD-RAM module 322 has a mechanism for moving the DVD-RAM disk between the DVD drive 316 and the DVD-RAM tray 318, thereby allowing the DVD-RAM from the DVD-RAM tray 318 to be moved. A mechanical operation of extracting the disk and loading the DVD drive 316 or extracting the DVD-RAM disk from the DVD drive 316 and transporting the disk to the DVD-RAM tray 318 is performed.

Figure 4 is a block diagram showing the configuration of a data processing process of the DVD network data storage device according to the present invention. The components shown in dotted lines in FIG. 4 are hardware and a database such as the DVD-RAM module 406 and the hard disk drive 408. As shown in FIG. 4, the software of the DVD network data storage device includes a server block 402 for controlling a server-type computer and a user interface block (UIB) 418 for communicating with a client.

The server block 402 includes a management process 412, a control process 420, and a write process. Management Process 412 performs a number of user interface processes (UIPs) and TCP / IP communications connected to the network and performs the following functions. It performs client request command processing function that receives and processes data retrieval, storage and deletion requests from the user interface process (UIP). A traffic management function for managing requests of a plurality of user interface processes (UIP) and a log function for recording a list of performed operations in a database are performed. When the data storage request is received from the user interface process (UIP), the data storage request processing sequence of the management process 412 is as follows. It receives the data storage request packet from the UIP, checks the current traffic state, checks whether the data storage request of the UIP can be processed, and returns the result. If the data can be stored, the data is received from the user interface process (UIP) and stored in the hard disk drive 408. The data storage process is recorded in the database 404 as the history search reference data. Take advantage.

When receiving a data retrieval request from the user interface process (UIP), the data retrieval request processing sequence of the management process 412 is as follows.

First, the data retrieval request packet is received from the UIP, the current traffic state is checked, and then the data retrieval request of the UIP can be processed, and the result is returned. As a result of the check, if the traffic condition is good, the user interface process (UIP) can retrieve the data. When the data deletion request is received from the UIP, the information of the data to be deleted received from the UIP is recorded in the database. Thereafter, other data can be overwritten in the memory area in which the data to be deleted is written.

The control process 420 is not executed independently but is executed through the management process 412 and the write process 410. The control process 420 is responsible for the control of the DVD-RAM module 406, and controls the loading, unloading, check, format, etc. of the DVD-RAM disk.

The write process 410 refers to the contents of the log table recorded by the management process 412 in the database, and writes or deletes the data in the DVD-RAM disk and then adds the contents to the log table. Or delete it. While the write process 410 is running, current state information of the write process 410 is transmitted to the management process 412 via TCP / IP, which is for traffic management of the management process 412.

The user interface block 418 consists of a single user interface process (UIP). It performs TCP / IP communication with the management process 412 and manages the database. The user can store, update and delete information in the database through message transfer between clients. The user interface block 418 can change the functionality of the user interface process according to the functionality of the system.

5 is a diagram illustrating a data flow in a data read and write operation of the DVD network data storage device according to the present invention. First, FIG. 5A is a diagram illustrating a data flow in a data read operation. In the data read operation, when a data request is made from the client, the data is checked in the cache area of the hard disk drive. If the same data exists in the cache area, the data is downloaded directly from the cache area. At this time, the data download path F is relatively fast. If the data requested by the client does not exist in both the cache area and the mirroring area of the hard disk drive, the data is retrieved from the DVD-RAM and transmitted to the client first, and then the data is restored to the hard disk drive block by block. . At this time, the data download path (S) is relatively slower than the direct download from the hard disk drive because the drive speed of the DVD-RAM. 5B is a diagram illustrating a data flow in a data write operation. The data write operation first checks the history of the hard disk drive and allocates an area where the data to be transmitted from the client can be buffered. If the hard disk drive does not have enough space to allocate a buffering area, delete some of the oldest data to secure the required buffering area and then save the data uploaded from the client. The criterion of data deletion is determined as the reference frequency of the data. In other words, it is determined that the reference frequency is lower as the data that has elapsed much since the most recent reference time is deleted first. The data uploaded to the hard disk drive at high speed is then written to the DVD-RAM at a relatively low speed by the central processing unit at a time when the standby time of the DVD-RAM is relatively long. The latency of the client is very short because the upload rate from the client to the hard disk drive is relatively much faster than writing data to the DVD-RAM.

6 is a flowchart illustrating the operation of the DVD network data storage device according to the present invention. First, FIG. 6 (a) is a flowchart illustrating a data retrieval method of a DVD network data storage device according to the present invention. Referring to FIG. 3 and FIG. 6 (a), a data retrieval method is as follows.

As shown in FIG. 6 (a), when a data retrieval request packet is transmitted from the client 320 in the connection wait state (S101) of the client 320 connected to the network, the storage location of the corresponding data is checked (S102). ). That is, the search request packet of the client 320 is analyzed to determine whether the corresponding data is stored in the hard disk drive 310 or the DVD-RAM module 322. If the client 320 requests data stored in the DVD-RAM module 322, it is determined that the data of the hard disk drive 310 is lost, and the corresponding data of the DVD-RAM module 322 is determined. And then restore the same data to the hard disk drive. When the data requested by the client 320 is stored in the hard disk drive 310, directory location information of the hard disk drive 310 in which the data exists is transmitted to the client 320 (S103). This allows the client 320 to receive the desired data from the hard disk drive 310 quickly and in real time without accessing the relatively slow DVD-RAM module 322. If the data requested by the client 320 is stored in the DVD-RAM module 322, it is determined whether the current data search is possible (S104). That is, it is determined whether the replacement of the DVD-RAM disk is performed at the request of another client 320 that is already accessing and retrieving data. This is because when the DVD-RAM disk is being replaced by a data request of another client 320, data retrieval by the DVD-RAM module 322 is impossible. If data retrieval is not possible, this is notified to the client 320 (S105). If the current replacement of the DVD-RAM disk is being performed, priority is given to the client 320 before the current point in time, and the data retrieval request of the client 320, which is connected later, is held in a waiting state or notified that the operation is being performed. Encourage them to do their work.

If data retrieval is possible, priority is given to the client 320 requesting the current data retrieval by setting a corresponding flag so that the replacement of the DVD-RAM disk is not performed by a data retrieval request of another client 320 that is generated later. It is given (S106). The setting of the flag is to be used as reference data for determining data retrievability in the above-described data retrieval determination step (S104). The DVD-RAM disk, which stores the corresponding data, is loaded in the DVD drive 316 and then mounted in the file system (S107). As a result, the client 320 may retrieve the corresponding data. When the client 320 requests data retrieval from the DVD-RAM module 322, directory location information of the corresponding data mounted on the file system is transmitted to the client 320 (S108). In this case, since the data of the hard disk drive 310 is damaged, the data is restored from the DVD-RAM module 322 to the hard disk drive 310 by giving priority to the stability of the DVD-RAM data. Secure the stability (S109). The corresponding flag is initialized to allow the replacement of the DVD-RAM disk at the request of another client 320 (S110). In addition, the client 320 is notified that the requested data retrieval is completed, and the CPU 306 is changed to the standby mode (S111). Figure 6 (b) is a flowchart showing a data storage method of the DVD network data storage device according to the present invention. The data storage method will be described with reference to FIGS. 3 and 6 (b) as follows. As shown in FIG. 6 (b), when a confirmation request packet for data storage possibility is transmitted from the client 320 in the connection waiting state S201 of the client 320 connected to the network, the current write process WP is performed. It is determined whether the operation is in operation (S202). If the current write process WP is being performed, the client 320 is notified that data is not stored (S203). If the write process WP is not currently being performed, the client 320 is notified that the data can be stored (S204). ).

When the information packet of the data to be stored is transmitted from the client 320, it is checked whether the same data is already stored (S205). If the same data is already stored, it is notified to the client 320 (S206). If the same data does not exist, it is checked whether sufficient storage space is secured in the DVD-RAM module 322 (S207). If there is not enough storage space in the DVD-RAM module 322, this is notified to the client 320 (S208). If there is enough storage space in the current DVD-RAM module 322, the position of the DVD-RAM disk is searched in consideration of the size of data to be stored (S209). The memory location of the DVD-RAM disk in which the data is to be stored is transmitted to the client 320 (S210), and the data is successfully uploaded (S211). If the data is successfully uploaded, the stored data information is registered in the database to determine the operation order of the write process WP (S212), and the CPU 306 is placed in the standby mode. If the data has not been uploaded successfully, switch to standby mode directly.

As described above, the DVD network data storage device according to the present invention integrates a DVD-RAM module control device and a plurality of DVD-RAM modules into one system, and mounts a HDD-RAM module and a hard disk by mounting a hard disk inside the system. By implementing cache and mirroring functions between the disk drives, it provides fast access time, stable data storage and real-time multiple access by the mirroring function.

Claims (3)

A DVD-RAM module configured to drive the DVD-RAM disk to store and retrieve data; Including a DVD-RAM module control device having a hard disk drive for performing a mirroring function for backing up the data stored in the DVD-RAM module and a cache function to compensate for the data access speed of the DVD-RAM module DVD network data storage system. The method according to claim 1, The DVD-RAM module, A DVD drive for driving the DVD-RAM disk; And a DVD-RAM disk carrying mechanism for loading and unloading the DVD-RAM disk. The method according to claim 1, The DRAM module control device, The hard disk drive; A network interface for data communication with a client; And a CPU for controlling the DVD-RAM module and the hard disk drive and the network interface.