JPS6173455A - Backup system - Google Patents
Backup systemInfo
- Publication number
- JPS6173455A JPS6173455A JP59194685A JP19468584A JPS6173455A JP S6173455 A JPS6173455 A JP S6173455A JP 59194685 A JP59194685 A JP 59194685A JP 19468584 A JP19468584 A JP 19468584A JP S6173455 A JPS6173455 A JP S6173455A
- Authority
- JP
- Japan
- Prior art keywords
- data
- primary station
- backup device
- station
- backup
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L13/00—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Small-Scale Networks (AREA)
- Maintenance And Management Of Digital Transmission (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は例えば、通信回線を通じて送られてくるデータ
に１回線障害が発生した場合にも、データぬけが発生し
ないようにリカバリ手段を講じたバンクアップシステム
に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention provides, for example, a bank that takes recovery measures to prevent data from being lost even if one line failure occurs in data sent through a communication line. Regarding the up system.
主装置の異常を何らかの方法で検出し、従装置の１つを
主装置として切羨るバックアップ方式は多数ある。例え
ば特開昭５５−９７６４７号にも記載されている。しか
しながら、通イ百回線を介してバックアップ装置を接続
し、１次局が異常となりだとき、１次局として製作させ
るようなバックアップ方式では、何らかの原因で、１次
局で受信できたデータが２次局で受１ｇできなかりた場
合、バックアップｆ！置が記録するファイルにデータぬ
げが発生する。There are many backup methods in which an abnormality in the main device is detected by some method and one of the slave devices is used as the main device. For example, it is also described in JP-A-55-97647. However, with a backup method in which a backup device is connected via a communication line and the primary station is made to function as a primary station when an abnormality occurs, for some reason the data that could be received by the primary station may become 2nd. If you can't receive 1g in the next game, backup f! Data loss occurs in the file recorded by the device.
本発明の目的は、上に述べたようなデータぬけをな（丁
ためのリカバリ方式を考慮したバックアップシステムを
提供することにある。An object of the present invention is to provide a backup system that takes into consideration a recovery method for preventing data loss as described above.
この発明によれば、バックアップｇｃ置を２次局の１つ
とし、バックアップ装置でデータ受信異常が発生し、か
つ１次局が正常受信したためリカバリ処理が発生しなか
りたとき、バックアップ装置のみの受信異常発生とみな
し、バックアツ７装置から１次局に対して受信異常の発
生したデータの転送を要求し、１次局は要求されたデー
タをバックアップ３ｉｆｔへ送ることＫより。According to this invention, the backup GC station is one of the secondary stations, and when a data reception error occurs in the backup device and recovery processing does not occur because the primary station receives data normally, only the backup device can be used. It is assumed that a reception error has occurred, and the BackAtsu 7 device requests the primary station to transfer the data in which the reception error occurred, and the primary station sends the requested data to the Backup 3ift.
データの欠落を防止するものである。This is to prevent data loss.
以下に１図に基づいて本発明の一実施例を具体的に説明
する。第１図および第２図は本実施例で便用する回線プ
ロトコルの概要である。１はポーリング（ＰＯＬ）、２
はレスポンス（ＡＣＫ） 、 ５はアンテンション（Ａ
ＴＴＮ）、 ４はデータ要求、５は２次局のデータ、
６は送信要求、７はＡＣ’に、 ８は１次局のデータ、
９は受信完了である。データ要求４のあとＫは必ずデー
タ５がくる。An embodiment of the present invention will be specifically described below based on FIG. FIGS. 1 and 2 are outlines of the line protocol used in this embodiment. 1 is polling (POL), 2
is the response (ACK), 5 is the antension (A
TTN), 4 is data request, 5 is secondary station data,
6 is a transmission request, 7 is for AC', 8 is primary station data,
9 indicates completion of reception. After data request 4, K always receives data 5.
またＡＴＴＮ ３のあとにはデータ要求４が、これがこ
なヴればＰＯＬｌが（る。Also, after ATTN 3, there is a data request 4, and if this is fulfilled, POL1 is issued.
第３凶にシステム構成とデータの流れを示す。The third example shows the system configuration and data flow.
１０は１仄局で、これは榎数の２次局１２の各々に対し
順欠ＰＯＬを送出してデータ送信要求の有無を調べ、も
しデータ送信要求があれば２次局１２にデータを送（、
Ｔさせる。また２次局１２からデータ送信要求があれば
、その２次〕う１２に７″−夕を送出する。１１は１次
局１０のバックアップ装置で、これは１次局１０からの
ＰｆＪＬに対して２次局１２と同様応答ができる。１次
局１０と２次局１２とバックアップ装置１１は回線１３
によって相互に接続されている。通常、データは矢印１
４のように１次局１０に取り込まれると同時に、回線を
常時モニタしているバックアップｇ １ｔ１１にも取り
込まれる。データが１次局１０に取り込まれなかったと
きは、１次局１０はリカバリ処理を行い、データの再送
を２次局１２に要求する。このため、バックアップ映Ｉ
Ｉｔ１１は、データを取り込みそこねることはない。10 is a single station, which sends out sequential POL to each of the number of secondary stations 12, checks whether there is a data transmission request, and if there is a data transmission request, sends the data to the secondary station 12. (,
Let T. Also, if there is a data transmission request from the secondary station 12, it sends a 7"-7 to the secondary station 12. 11 is a backup device for the primary station 10, which responds to PfJL from the primary station 10. can respond in the same way as the secondary station 12.The primary station 10, secondary station 12, and backup device 11 are connected to the line 13.
are interconnected by. Usually the data is arrow 1
4, it is taken into the primary station 10, and at the same time, it is also taken into the backup g1t11, which constantly monitors the line. When the data is not captured by the primary station 10, the primary station 10 performs recovery processing and requests the secondary station 12 to retransmit the data. For this reason, the backup image
It11 never fails to capture data.
しかしながら、データが１次局１０へ取つ込まれたＫも
かかわらず、バックアップ装置１１がそのデータを取り
そこねる勿合がある。この場合、バックアップ説［１１
が１次局からのＰＯＬｌを受信したとき、取ワそこねた
データの転送を１次局１０に要求する。そこで１？Ｘ、
局１０はデータをバックアップ装置１１に転送する。こ
の様子を第３図の矢印１５．１６に示す。However, even though the data has been imported to the primary station 10, there is a possibility that the backup device 11 will fail to retrieve the data. In this case, the backup theory [11
When it receives POLl from the primary station, it requests the primary station 10 to transfer the data it has failed to handle. 1 there? X,
Station 10 transfers the data to backup device 11 . This situation is shown by arrows 15 and 16 in FIG.
またバックアップ装置１１が１次局１０の異常を検出す
る手段は以下の通りである。すなわち、バックアップ装
［１１は第１図のＰＯＬｌを常に監視する。一定時間内
にＰＯＬｌが検出されないと、１次局１０の障害とみな
し、１次局１０を切離し、口外自身が１次局となる。Further, the means by which the backup device 11 detects an abnormality in the primary station 10 is as follows. That is, the backup device [11] always monitors POL1 in FIG. If POLl is not detected within a certain period of time, it is assumed that there is a failure in the primary station 10, the primary station 10 is disconnected, and the outside itself becomes the primary station.
以上に述べた如（、本発明によれば、バックアップデー
タファイルを作成する場合に生じうるデータの欠落を完
全に防止できる効果がある。As described above, the present invention has the effect of completely preventing data loss that may occur when creating a backup data file.
第１図および第２図は本発明の一実施例で使用する回線
プロトコルを示す図、第３図は前記実施例のシステム構
成とデータの流れを示す図である。
１・・・ホーリンｙ （ＰＯＬ） ２・・・レスポンス
（ＡＣＫ）６・・・アテンシ画ン（Ａ’ＩＴＮ） ４・
・・データ要求５・・・データ ６・・・送信要求 ７
・・・許可８・・・データ ９・・・受信完了 １０
・・・１欠局１１・・・バックアップ装置1 and 2 are diagrams showing a line protocol used in one embodiment of the present invention, and FIG. 3 is a diagram showing the system configuration and data flow of the embodiment. 1... Holiny (POL) 2... Response (ACK) 6... Attention screen (A'ITN) 4.
...Data request 5...Data 6...Send request 7
...Permission 8...Data 9...Reception completed 10
...1 out of service 11...backup device
Claims (1)
に接続され、当該伝送路のモニタおよびデータの取り込
みを行い、かつ当該伝送路をモニタして前記１次局の異
常を検出したとき当該１次局を切離し、自分自身が１次
局となるバックアップ装置と、当該バックアップ装置か
ら前記１次局に対してデータ転送を要求する手段と、前
記１次局から前記バックアップ装置に要求されたデータ
を転送する手段からなることを特徴とするバックアップ
システム。A primary station, a secondary station, and a transmission line connecting the two stations are connected to the transmission line, monitor the transmission line and capture data, and monitor the transmission line to detect abnormalities in the primary station. means for requesting data transfer from the backup device to the primary station; and means for requesting data transfer from the backup device to the primary station; A backup system comprising means for transferring data requested by.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59194685A JPS6173455A (en) | 1984-09-19 | 1984-09-19 | Backup system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59194685A JPS6173455A (en) | 1984-09-19 | 1984-09-19 | Backup system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6173455A true JPS6173455A (en) | 1986-04-15 |
Family
ID=16328579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59194685A Pending JPS6173455A (en) | 1984-09-19 | 1984-09-19 | Backup system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6173455A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02254835A (en) * | 1989-03-28 | 1990-10-15 | Nec Corp | Data communication system |
-
1984
- 1984-09-19 JP JP59194685A patent/JPS6173455A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02254835A (en) * | 1989-03-28 | 1990-10-15 | Nec Corp | Data communication system |
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