JPH10254629A - Data archive system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to take out and carry archived data without transferring the archived data through a network by allowing a library controller to provide a control means which carries a storage medium to a medium discharge/insertion slot for a changer at a request from a client computer. SOLUTION: A portable medium library device 200 has the medium discharge/ insertion slot 210 and discharges a storage medium having data that a client computer specifies. The discharged storage medium is read and written by a drive device of the client computer or a drive device of a remote computer. The portable medium storage library 200 consists of a library controller 220, a drive device 280, a medium insertion slot 210, a changer 290, and a medium storage box 295. In this case, the changer 290 carries the storage medium stored in the medium storage box 295 to drive devices 280-1 to 280-5 or the medium insertion/discharge slot 210 according to an instruction that the library controller 290 sends out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data archive system using a library type storage device for portable storage media. In particular, the present invention relates to a data archive system system in which a library type storage device is provided with redundancy to improve availability.

[0002]

2. Description of the Related Art Hitherto, as a data archiving method of a computer system, there are a method in which an archiving device is provided for each computer and the method is performed individually, and a method in which a data archive server is used and intensively performed.

The former distributed processing method is a method in which a storage device such as a magnetic tape device is connected to each computer, and data on the computer is stored in the connected magnetic tape device or the like. This method has the advantage that when carrying the stored data, it is only necessary to bring the magnetic tape storing the necessary data, so that the processing time for carrying the data is short, but the data for archiving must be stored for each computer. There is a disadvantage that the cost is high because a storage device needs to be installed. Further, since the management of the storage medium storing the data is not automated, there is also a problem that the data is easily lost, and it takes time to retrieve and retrieve necessary data. Further, there is a problem that it is difficult for a plurality of users to share data.

The latter method of processing data intensively by a data archive server is a method of connecting a plurality of (client) computers to a data archive server via a network and storing data intensively in a storage device managed by the data archive server. It is. This method can reduce the cost required for data archiving per client. Therefore, a library type storage device having a relatively high unit price as shown in Japanese Patent Publication No. 7-27442, "Method for Improving Hit Rate in Hierarchical Structure of Data Storage Device and Device therefor" can be used.
By using such a library type storage device, the management of the storage medium can be automated, and the problems of the former method that data is lost and that it takes time to retrieve and retrieve data can be solved. In other words, data that is too large for the client computer to hold offline can now be held online, though via a network. Further, data stored in the library type storage device can be easily shared from a plurality of client computers. Due to the emergence of portable media storage devices such as magneto-optical disks and DVDs (Digital Video Disks) that can be accessed randomly and have lower bit costs than magnetic disks, library-type storage devices will be used in the future. It is expected that data archive systems will spread.

Next, a description will be given of a conventional technique relating to a storage device having redundancy in order to increase data availability.

[0006] The following Patentson paper is known.

A. C. M. Sigmod Conference Proceedings, June 1988, June 109, page 109
−116 (D. Patterson, et al: A Case for RedundantAr
rays of Inexpensive Disks (RAID), ACM SIGMOD confere
nce proceeding, Chicago, IL, June 1-3, 1988, pp.109-11
6) Patterson's paper discloses a technique related to data arrangement on a disk array.

The disk array is a mechanism for realizing high performance and high reliability of the disk system. In a disk array, in order to improve performance, physically a plurality of disk devices appear as one disk device to a processing device. On the other hand, for higher reliability, when a failure occurs in a disk device storing data, redundant data for recovering data is stored in another disk device.

Normally, data which is a unit of read / write of a disk device is called a record.
Proposed several record placement methods. However, when a disk array is used, a record which is a read / write unit viewed from the processing device may have a different data length from a record actually recorded on the disk device. Hereinafter, the former is called a logical record and the latter is called a physical record. Hereinafter, some record arrangement methods proposed in the Patterson's paper will be described.

A first arrangement method is an arrangement method in which a logical record, that is, a record viewed from the processing device side, is divided into m (m ≧ 1) physical records on a disk device and stored. Hereinafter, this arrangement method is referred to as a division arrangement method. When the divided arrangement is used, one logical record can be transferred to and from m disk devices, so that the same effect as apparently increasing the data transfer speed by m times can be obtained.

Next, a method of creating redundant data in a divided arrangement will be described. In the divided arrangement, n (n ≧ 1) redundant data are created for m physical records obtained by dividing a logical record, and each of the redundant data is stored in a disk device as one physical record (there are n in total). I do. Less than,
A physical record that stores data that is directly read / written by the processing device is called a data record, and a physical record that stores redundant data is called a parity record. A group including m data records and n parity records is called a parity group. Normally, if the number of parity records in a parity group is n, n
Even if a failure occurs in up to disk units, the data of the parity group can be recovered.

The second arrangement method is an arrangement method in which a logical record, which is a read / write unit as viewed from the processing device, is stored as one physical record, that is, one data record, on a disk device. Hereinafter, this is referred to as a non-divided arrangement. Therefore, a logical record is equivalent to a data record. (Since a data record or a parity record is assigned to each physical record, a physical record and a logical record are not necessarily equivalent. That is, one logical record is one physical record, but one physical record is (It is not necessarily one logical record but may be a parity record.) The feature of the non-divided arrangement is that the read / write processing can be executed for each disk device constituting the disk array. . (If the split arrangement method is adopted, it is necessary to occupy a plurality of disk devices for read / write.) Therefore, if the non-divided arrangement is adopted, the multiplicity of read / write processing that can be executed in the disk array is improved. And the performance can be improved. Even in the non-divided arrangement, n parity records are created from m data records and stored in the disk device. However, in the case of the split arrangement, the set of data records in the parity group is one as viewed from the processing device.
While one logical record is formed, in the case of the non-split arrangement, each data record becomes a completely independent logical record from the viewpoint of the processing device.

In a computer system, magnetic tapes and magnetic tapes are often used as storage devices other than disk devices.
There are optical storage devices and the like. Particularly recently, DVD (Digital)
tal Video Disk) is attracting attention. The feature of these storage devices is that the storage medium and the drive device are separated from each other, the storage medium is loaded into an arbitrary drive device, and data on the storage medium is read and written. Generally, these media are referred to as portable media.
In a large-scale computer system, a library is introduced to easily manage a very large number of portable media. The library includes a storage for storing a large number of storage media in addition to a storage medium and a drive device (hereinafter referred to as a drive), and a medium changer (for transferring storage media between the storage and the drive device). Hereinafter referred to as a changer).

Since the data handled by the computer system is getting larger and larger, it is necessary to improve the availability of the data.
Is also very high. Therefore, even in the storage device system constituted by the portable medium as described above, the Pattern
It is effective to achieve high availability by applying the concept proposed in the son's paper.

[0015]

The data archive server using the automatic storage device library has the above-mentioned advantages. However, if the stored data is to be used, the data must be copied via a network.
Generally, data transfer over the network is slow,
Transferring large amounts of data takes time. For example, when data is transferred to a magnetic disk device (1 Gbyte) generally used in a personal computer using Ethernet (10 Mbits per second) which is currently widespread, it takes at least 800 seconds or more. Actually, it takes several times as much time as the efficiency of the network and the processing time other than the network are required. In particular, when using data from a remote location, even if the network is connected, it is usually much slower than a local network (a standard modem using a public line is 28.8 kbits per second), and Often the network is not available. Therefore, data is carried on a replaceable medium (magnetic tape, optical disk, or the like).

However, the library type storage device usually has no means for receiving a medium ejection request from a client computer for taking out a medium and using it in another device, and cannot take out and bring in a necessary medium.

Further, if the medium is removed, the data on the medium cannot be accessed. If the medium storing the data commonly accessed by the client computers is removed, the data is read out. , Updating, adding, and the like cannot be performed until the medium is set back to its original state.

A first object of the present invention is to provide a centralized data archive server system which can retrieve archived data without network transfer processing of the archived data and can carry the data.

A second object of the present invention is to provide a system capable of processing access to data on a storage medium even if a storage medium is removed by a data archive server using a library device.

A third object of the present invention is to update data on a storage medium extracted by the above system and update data on a data archive server side during the extraction, and re-input the storage medium to a library storage device. The aim is to provide a means for later synchronization.

A fourth object of the present invention is to provide a means for synchronizing, in real time, the update of the data on the storage medium retrieved by the above system and the data update on the data archive server being retrieved. .

[0022]

SUMMARY OF THE INVENTION A centralized archive server using a portable medium automatic library storage device allows a medium to be extracted and carried. There are cases where original media is taken out and cases where copies are made and brought out.

For the first object, in the present invention, a portable medium library device is provided with a medium discharge / insertion port, and upon request from a client computer, the library control device sends a storage medium to a changer to a medium discharge / input port. A control means for carrying is provided. A method for ejecting the storage medium itself in which the data requested by the client is stored, and a storage medium for ejection provided in the portable medium library device, the library control device having means for controlling copying of the storage medium,
There is a method of creating and ejecting a copy of a storage medium. Also,
The client computer is provided with a drive device that can read data from a storage medium or a drive device that can read and write.

To achieve the second object, a configuration information management means for managing a set (parity group) of a library control device to which storage medium redundancy is added, and a storage device having a failure using the added redundancy. Ejection / duplication medium access control means for enabling access from a client computer even when a medium is present is provided to enable access to the ejected storage medium.

In order to achieve the third object, means for holding updated information in the storage medium ejected to the library control device, and a client computer which uses the ejected storage medium in a local drive device, use the storage medium. Means for holding the update information to the storage medium and storing the update information in the storage medium, and when the storage medium is reloaded into the library device, the update information and the client computer record the update information to the discharged storage medium held by the library control apparatus. There is provided an input medium synchronizing means for reflecting the update on the library control apparatus side during the ejection using the update information to the storage medium to the storage medium.

To achieve the fourth object, a communication means between the client computer and the data archive server which uses the ejected storage medium by a local drive device, and the client uses the communication means to transmit data from the client to the data archive server. A means for acquiring update information, a means for acquiring update information at the client from the data archive server, and a means for receiving updated data are provided.

The client is provided with a drive device for reading the portable medium.

The library device of the archive server configures a parity group with a plurality of media, and can access the media even if at least one of them is removed.

In the read processing on the server side, data is recovered using parity.

The write processing on the server side updates the parity. Alternatively, only the updated data is recorded on another medium, and a dirty flag is set in the updated area. When a read request comes to the area, the medium on which the update is recorded is referred to.

In the read processing on the remote side, the read is performed as it is.

Write processing on the remote side is not allowed.
Alternatively, recording is performed in an area reserved for updating, and a dirty flag is set in the updated area. When a read request comes to the area, the area in which the update is recorded is referred to.

In the data synchronization process after the reinsertion of the medium, the file updated only on either the server side or the remote side validates the update, updates the file on the medium, and releases the dirty flag. The file updated by both will enable the server-side update, enable the remote-side update, enable both, or disable both at the discretion of the media owner or system administrator or in advance. Or two new files.

The archive server holds the time when the medium was extracted and the information of the extracted file, records the access to the file after the extraction, and sends the information to the client when requested by the client. Synchronize files. Also, the client side has means for recording the access to the file and sending the information to the server, and synchronizes the file.

A file lock function is provided in the server to secure the lock of the file to be updated by communication before updating on the remote side. The server records the update after the creation of the extraction medium on another medium, sets a dirty flag in the updated area, asks the server via communication before using the file on the remote side, receives the update, and sends it to the medium. Reflect the updates. The remote side sends the update to the server via communication and releases the lock.

[0036]

FIG. 1 shows the overall configuration of a data archive system to which the present invention is applied. The computer system includes a data archive server 100, a portable medium library device 200, and a client computer 3.
00, a drive device 500 connected to the client computer 300 and capable of using a storage medium handled by the portable medium library device 200, and a client computer 30
0 and the data archive server 100. Further, a remote computer 600 not connected to the data archive server 100 via a network and a drive device 550 connected thereto can also be included in the present system.

The basic feature of the present invention is that the portable medium library apparatus 200 has a medium discharge / insertion port 210 and discharges a storage medium including data designated by the client computer 300. Reading and writing the ejected storage medium using the drive device 500 of the client computer 300 or the drive device 550 of the remote computer 600.

As shown in FIG. 2, the data archive server 100 includes a network control 110 for connecting to the client computer 300, a library control device 200 and a library control 130 for transmitting commands for library control, archive data, and the like. It comprises a data archive service 120 for interpreting requests for storing and reading data in a library device coming from the client computer 300 and generating a library control device 220 for execution.

The portable storage device library 200 comprises a library control device 220, a drive device 280, a medium slot 210, a changer 290, and a medium storage 295.

The changer 290 conveys the storage medium stored in the medium storage 295 to the drive devices 280-1 to 280-5 or the medium loading / unloading port 210 according to a command sent from the library control device 220.

FIG. 7 is a configuration diagram of the client computer 300. The client computer 300 has a local drive device 500 for accessing the storage medium ejected from the portable medium library device. The remote computer 600 not connected to the data archive server 100 via the network also has a drive device 550 as shown in FIG. These drive devices can read data but cannot write data, or they can read and write data. In general, a read-only drive device is less expensive and does not cause the problem of data synchronization described later.

[Parity Group and Logical Volume of Storage Medium] The basic configuration of a storage medium with redundancy added and an access method when a failure occurs will be described with reference to FIGS. The storage medium 700 is divided into units called fixed-length sectors, and is accessed using sector numbers. In the portable medium library device 200, the recording medium 7
Even if access becomes impossible due to a failure, a high reliability is provided that does not affect the client computer 300 due to the failure. Therefore, as shown in FIG. 4, a plurality of storage media 700-1, 700-2, 700-
3, 700-4, a redundant code calculated from data on another storage medium is recorded on one of the sheets 700-4. This set is called a parity group 800. A typical example of this redundant code is 700-
Parity, which is a code calculated by an exclusive OR of all data of 1, 700-2, and 700-3, is used.
This parity is calculated for each sector of the storage medium. The library control device 220 provides the client computer 300 with access in units of the parity group 800. This access unit is called a logical volume. The logical volume is divided into fixed-length sectors, and when the sector size is the same, a one-to-one correspondence is provided with the sectors of the storage media 700-1 to 700-3. This correspondence is determined by the configuration information of the storage medium 700 and the parity group 800 held by the configuration information holding unit 241 of the library control device 220 and the sector correspondence rules. The sector correspondence rule is as follows from the first sector of the storage medium 700-1.
-3 may be sequentially associated, or Pa
As described in Tterson's dissertation as RAID-4, it is also possible to perform the association for performing rotation in a certain unit. In any case, the capacity that can be used by the client computer 300 in the parity group 800 is equivalent to three storage media in this case.

[Method of Accessing Failure Recording Medium Using Parity] When one storage medium 700-2 in the parity group fails, the data on the storage medium is as shown in FIG. Then, the remaining storage media 700-1, 700-3, and 700-4 of the parity group are calculated by calculating the exclusive OR of the remaining storage media. Obstacle medium 700-
As shown in FIG. 6, the write access processing to the data D2 is performed by changing the corresponding parity (P of 700-4) to the data D1 of the data 700-1.
And the new parity (Pnew) calculated by the exclusive OR of the data D3 of the data 400-3, the old parity (Pold) of the data 400-4, and the data (D2new) to be written to the data 400-2. After that, when there is a read access to 700-2 thereafter, D2new can be regenerated by the method shown in FIG.

This processing is performed by the faulty medium access means 246 of the library control device 220.

Hereinafter, a data access procedure in this system will be described.

[Access processing when there is a medium in the library] FIG. 9 shows a flow chart.

The client 300 sends the access request sending means 312 of the data archive server access control 310.
An access request is sent from the network control 340 to the data archive server 100 by using (1000).

The access request management means 121 of the data archive server 100 interprets the request and generates a changer control command (1010).

Whether access is read or write is judged by the access request management means (1020).

In the case of a read, the changer 290 loads the data medium into the drive 280 (1030).

The access request management means 121 generates a drive control command and sends it to the library control device 220 (10
40). The medium access control 240 of the library control device 220 sends a command to read the requested data to the drive device 280 via the drive control 260, and as a result, the data read by the drive device 280 is transmitted to the client 300 via the data archive server 100. Send (1
050).

In the case of writing, the changer 290 stores the data medium and the corresponding parity medium in the drive 28.
0 (1060). The access request management means 121 generates a drive control command and sends it to the library control device 220 (1070). The medium access control 240 of the library control device 220 sends a command to update data and parity to the drive device 280 via the drive control 260, and as a result, the data and parity are updated by the drive device 280. An end report is sent to the client 300 via the server (1080).

[Access processing when there is no medium in library] The client 300 sends an access request to the data archive server 100 (1100). The access request management means 121 of the data archive server 100 interprets the request and generates a changer control command (1110). The access request management means 121 determines whether the access is read or write (1120).

In the case of a read, the library controller 220
Medium access control 240 of the configuration information holding means 241,
The medium of the same parity group is identified using the ejection / duplication medium access control means 246, the changer control command is changed, and the changer 290 loads the medium of the same parity group as the medium into the drive 280 (113).
0). The access request management means 121 generates a drive control command (1140). The data is regenerated using the parity by the method of FIG. 5 (1150). The regenerated data is transmitted to the client 300 via the data archive server 100.
(1160).

In the case of a write, the library controller 220
Medium access control 240 of the configuration information holding means 241,
The medium of the same parity group is identified using the ejection / duplication medium access control means 246, the changer control command is changed, and the changer 290 loads the medium of the same parity group as the medium into the drive 280 (117).
0). The access request management means 121 generates a drive control command (1180). The parity is updated by the method shown in FIG.
190).

An end report is sent to the client 300 via the data archive server 100 (1200).

[Medium Ejection Processing] The client 300 sends a volume removal request to the data archive server (1201).

The medium removal / insertion request management means 123 of the data archive server 100 interprets the request and sends a medium ejection command to the library control device 220 (121
0).

If the medium access control 240 is the changer 29
0, a command to move the medium to the medium loading / unloading port is sent out and stored in the medium discharging / copying information holding means 242 (1
220). The changer 290 conveys the medium to the medium inlet / outlet 210 (1230). An end report is sent to the client 300 (1240).

[Medium Copy Processing] The client 300 sends a volume copy request to the data archive server (1).
300). The medium copy request management 124 of the data archive server 100 interprets the request and sends a medium copy command to the library control device 220 (1310). The medium access control 240 sends a command to the changer 290 to move the data medium and the duplication medium to the drive 500,
Stored in the medium ejection / replication information holding means 242 (132
0). Copy from data medium to copy medium (133
0). The changer 290 conveys the duplication medium to the medium input / output port 210 (1340). An end report is sent to the client 300 (1350).

[Client ejection medium access processing]
The medium is loaded into the drive 500 (1400). The local drive access control 320 generates a drive access command (1410). It is determined whether the access is read or write (1420).

In the case of a read, the drive control 330 sends an access command to the drive 500 (1430). The data is read from the drive 500 (1440).

In the case of write, update information is registered by the synchronization control 322 (1450). The drive control 330 sends an access command to the drive 500 (1460). The drive 500 writes the data (1470).

[Client Ejection Medium Access Processing During Remote Synchronization Support] A medium is loaded into the drive 500 (1500). Local drive access control 320
A drive access command is generated (1510). It is determined whether the access is read or write (1520). In the case of read, the remote synchronization control 612 inquires of the data archive server whether or not there is an update (1530). It is determined whether there is an update (1540). If there is no update, the drive control 330 sends an access command to the drive 500 (1550). The data is read from the drive 500 (1560).

When there is an update, update data is obtained from the data archive server 100 (1570).

The drive control 330 sends an access command to the drive 500 (1580). Write the updated data to the drive 500 (1590). The data archive server 100 deletes the update information of the sector (160
0).

In the case of write, update information is registered by the synchronization control 322 (1610). Data archive server 100
(1620). The data archive server 100 registers the update information of the sector (1630).
The drive control 330 issues an access command to the drive 50
Send to 0 (1640). The drive 500 writes the data (1650).

[Synchronization Processing After Re-Insertion of Medium] The data archive server 100 is notified of the insertion of the medium (1700). The medium is loaded into the drive device 280 (1710). The input medium synchronization control 249 executes a synchronization process from the update information on the remote side and the update information on the server side (1720).

[0069]

According to the present invention, a centralized data archive server system that can retrieve archived data without network transfer processing of the archived data and can carry the data is realized.

Further, even if a storage medium is removed by a data archive server using a library device, access to data on the storage medium can be processed, and availability of shared data can be increased.

Further, the updating of the data on the storage medium extracted by the above system and the data update on the data archive server side during the extraction can be synchronized after the storage medium is re-input to the library storage device. Therefore, it is possible to maintain data consistency without prohibiting write access on either the data archive server side or the client computer that locally uses the ejected medium during the retrieval.

By communicating update information between a client computer using the ejected medium locally and the data archive server, synchronization can be performed in real time, so that it can be used even in a remote place having only relatively low-speed communication means. You can use the latest data,
Remotely updated data can be instantly shared by other clients.

[Brief description of the drawings]

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

FIG. 2 is a configuration diagram of a data archive server according to an embodiment of the present invention.

FIG. 3 is a configuration diagram of a portable medium library device of the present invention.

FIG. 4 is a configuration diagram of a parity group.

FIG. 5 is a data recovery process using parity.

FIG. 6 is a data update process using parity.

FIG. 7 is a configuration of a client computer according to an embodiment of the present invention.

FIG. 8 is a configuration of a remote computer according to an embodiment of the present invention.

FIG. 9 is a flowchart of an access process in the data archive server when a medium is present in the library device.

FIG. 10 is a flowchart of an access process in the data archive server when there is no medium in the library device.

FIG. 11 is a flowchart of a medium discharging process in the library device.

FIG. 12 is a flowchart of a medium duplication process in the library device.

FIG. 13 is a flowchart of access processing of a medium ejected from the library device in the client computer.

FIG. 14 is a flowchart of a process of accessing a medium ejected from a library device in a client computer when synchronizing data in a remote place in real time.

FIG. 15 is a flowchart of a synchronization process when a medium discharged to a library device is re-input.

[Explanation of symbols]

100: Data archive server, 200: Portable media library device, 300: Client computer, 4
00: Network, 500: Local drive of client computer, 600: Remote computer, 700: Storage medium, 800: Parity group, 210: Medium loading / unloading port, 220: Library control device, 280: Portable media library device 290: Medium changer, 295: Medium storage.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akira Yamamoto 1099 Ozenji Temple, Aso-ku, Kawasaki City, Kanagawa Prefecture, Ltd.System Development Laboratory, Hitachi, Ltd.

Claims (7)

[Claims] 1. A data archive system comprising a client computer, a data archive server, and a portable medium library device, wherein the client computer includes a drive device capable of reading a storage medium of the portable medium library device.
At least one client computer is connected to the data archive server via a network, the data archive server is connected to the portable media library device, and the portable media library device houses the storage medium and the storage medium A drive device for loading and unloading a medium storage and the storage medium and reading and writing data, and a medium loading / unloading for loading or unloading the storage medium into or from the portable media library device. An exit and a medium changer that conveys the storage medium, the data transmitted from the client computer to the data archive server via the network, and stored in the storage medium of the portable medium library device; The medium of the portable medium library device Data archiving system, characterized in that available by discharging from the incoming and discharge port, is loaded into the drive device of the client computer. 2. The data archive system according to claim 1, wherein said storage medium forms a parity group of a plurality of sets, and recovers data even if a failure occurs in any storage medium in said parity group. The portable medium library device has means for recovering data of a failed storage medium using the redundancy, and the storage medium ejected from the client computer via a data archive server. A data archive system capable of reading and writing data. 3. A data archive system comprising a client computer, a data archive server, and a portable medium library device, wherein the client computer includes a drive device that can read a storage medium of the portable medium library device.
At least one client computer is connected to the data archive server via a network, the data archive server is connected to the portable media library device, and the portable media library device houses the storage medium and the storage medium A drive device for loading and unloading a medium storage and the storage medium and reading and writing data, and a medium loading / unloading for loading or unloading the storage medium into or from the portable media library device. An exit and a medium changer that conveys the storage medium; data transmitted from the client computer to the data archive server via the network and stored in the storage medium of the portable medium library device; To another storage medium and copy Said medium is discharged from the input-outlet, data archiving system, characterized in that available by loading the drive unit of the client computer storage medium the portable medium library apparatus. 4. The data archive system according to claim 2, wherein the data update information in the storage medium being ejected is retained, so that the data update being ejected is stored on the storage medium after the storage medium is reinserted. A data archiving system that can be reflected. 5. The data archive system according to claim 2, wherein the client computer loaded with the discharged storage medium and a data archive server are not connected via a network. 6. The data archive system according to claim 2, wherein the client computer loaded with the discharged storage medium and a data archive server have communication means, and the data archive server or the portable medium library device discharges the storage medium. In the case where the client computer accesses the discharged storage medium while maintaining the data update information on the recording medium in the memory medium, the communication unit uses the communication unit to check whether or not the data to be accessed has been updated. Acquiring updated data using the communication means,
Alternatively, a data archiving system characterized by displaying that it has been updated. 7. The data archive system according to claim 6, wherein the client computer loaded with the discharged storage medium and a data archive server have communication means, and the client computer is discharged from the portable medium library device. In the case where the data archive server accesses the ejected storage medium, it checks whether or not the data to be accessed has been updated using the communication means, and the data has been updated. A data archiving system, wherein updated data is obtained using the communication means, or the updated data is reported.