JPH04141881A - Data storage device - Google Patents

Data storage device

Info

Publication number
JPH04141881A
JPH04141881A JP2264027A JP26402790A JPH04141881A JP H04141881 A JPH04141881 A JP H04141881A JP 2264027 A JP2264027 A JP 2264027A JP 26402790 A JP26402790 A JP 26402790A JP H04141881 A JPH04141881 A JP H04141881A
Authority
JP
Japan
Prior art keywords
data
storage device
rewritable
stored
rewrite
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
Application number
JP2264027A
Other languages
Japanese (ja)
Inventor
Yoshihiro Noguchi
喜洋 野口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP2264027A priority Critical patent/JPH04141881A/en
Publication of JPH04141881A publication Critical patent/JPH04141881A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To reduce the consumption of a capacity by detecting the rewrite frequency of data stored in a first storage device and moving data whose output becomes less than a prescribed value to a second storage device. CONSTITUTION:At the time of newly inputting data, it is stored in the first storage device which can rewrite data. A discrimination device 3 consisting of a detection means detecting the rewrite frequency and a moving means moving data discriminates a case when the rewrite frequency of data is lower than the prescribed value and moves data to the second storage device which cannot rewrite data. Thus, data whose rewrite frequency is expected to be high is stored in the storage device in which data can be rewritten and data whose rewrite frequency is expected to be low in the storage device in which data cannot be rewritten. Thus, cost per data quantity can be reduced as a whole and reliability improves, whereby the consumption of the capacity can be reduced.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、書換え可能な記憶装置と、書換え不可能な記
憶装置を共に有するデータ記憶装置に関する。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a data storage device having both a rewritable storage device and a non-rewritable storage device.

従来の技術 近年、コンピュータを中心とした情報システムが、その
需要増大と、機器の性能向上にともない、その規模が拡
大し、その蓄積される情報量が急速に増大してきている
。この増大したデータを記憶するデータ記憶装置もその
動きに対応し、容量増大と機能向上がなされている。
BACKGROUND OF THE INVENTION In recent years, information systems centered on computers have expanded in scale and the amount of information they store has increased rapidly as demand for them increases and performance of equipment improves. Data storage devices that store this increased data have also responded to this movement with increased capacity and improved functionality.

従来のこのデータ記憶装置は、記憶装置として書換え可
能な記憶装置と、書換え不可能な記憶装置を併用してい
るのが一般的であり、用途に応じて記憶するデータを振
り分けて記憶させている。
Conventional data storage devices generally use a combination of rewritable and non-rewritable storage devices, and store data by sorting it out depending on the purpose. .

−船釣に書換え可能な記憶装置は記憶データ蛍光たりの
コストが高く、記憶についての信頼性が書換え不可能な
記憶装置に比較して低く、一方書換え不可能な記憶装置
はデータ蛍光たりのコストが安いという特徴を有してい
るため、これらの特徴に合致した有効活用が重要となっ
てきている。
- Rewritable storage devices for boat fishing have a high cost for storing data and have low reliability compared to non-rewritable storage devices, while non-rewritable storage devices have a high cost for storing data. Since it has the characteristic of being cheap, effective utilization that matches these characteristics is becoming important.

発明が解決しようとする課題 しかし従来の構成では、さまざまな書換え頻度の異なる
データの集合を記憶する際、書換え可能な記憶装置を使
用した場合、結果的に書換え頻度の低いデータが存在す
ると記憶に高いコストがかかるだけで、本来の記憶装置
の特徴が生かされず、かつ信頼性が低い。また書換え不
可能な記憶装置を使用した場合、書換え頻度の高いデー
タが存在すると書換えのための処理が必要となり記憶の
ために容量が浪費されるという問題点があった。
Problems to be Solved by the Invention However, with conventional configurations, when a rewritable storage device is used to store a set of data with various rewriting frequencies, if there is data that is rewritten with a low frequency, the data cannot be stored. It is expensive, does not take advantage of the original characteristics of the storage device, and has low reliability. Furthermore, when a non-rewritable storage device is used, there is a problem in that if there is data that is frequently rewritten, processing for rewriting is required and capacity is wasted for storage.

本発明は上記問題点を解決するために、書換え可能な記
憶装置と書換え不可能な記憶装置とを併せ持ち、全体と
してデータ量あたりのコストが安(信頼性が高く、かつ
容量の浪費が少ないデータ記憶装置を実現することを目
的とする。
In order to solve the above-mentioned problems, the present invention has both a rewritable storage device and a non-rewritable storage device, and the cost per amount of data is low overall (high reliability and low capacity wastage). The purpose is to realize a storage device.

課題を解決するための手段 本発明の上記目的を達成するために、書換え可能な第1
の記憶装置と書換え不可能な第2の記憶装置を有するデ
ータ記憶装置において、新たに入力されたデータは第1
の記憶装置に記憶されるとともに、第1の記憶装置に記
憶されているデータの書換え頻度を検出する検出手段と
、この検出手段の出力がある値以下になったデータを、
第2の記憶装置に移動する移動手段とを設けたものであ
る。
Means for Solving the Problems In order to achieve the above object of the present invention, a rewritable first
In a data storage device having a storage device and a second storage device that cannot be rewritten, newly input data is stored in the first storage device.
a detection means for detecting the rewriting frequency of the data stored in the first storage device and the first storage device;
A moving means for moving to the second storage device is provided.

作用 上記の本発明のデータ記憶装置は、データの追加時すな
わち新たにデータ入力するときは書換え可能な第1の記
憶装置に記憶させ、その後書換え頻度を検出する検出手
段と、データ移動する移動手段からなる判別装置がデー
タの書換え頻度が一定値より低い場合を判別して書換え
不可能な第2の記憶装置にデータを移動することにより
、書換え頻度が高いと予想されるデータが書換え可能な
記憶装置に、書換え頻度が低いと予想されるデータが書
換え不可能な記憶装置に記憶される。これにより全体と
してデータ量あたりのコストが安く信頼性が高く、かつ
容量の浪費が少ないデータ記憶装置が実現できる。
Operation The data storage device of the present invention described above includes a detection means for storing data in a rewritable first storage device when adding data, that is, inputting new data, and detecting the rewriting frequency thereafter, and a movement means for moving the data. A discrimination device consisting of the following determines when the data rewriting frequency is lower than a certain value and moves the data to a non-rewritable second storage device, thereby converting data that is expected to be rewritten frequently to rewritable storage. In the device, data that is expected to be rewritten infrequently is stored in a non-rewritable storage device. As a result, it is possible to realize a data storage device that has low cost per data amount, is highly reliable, and wastes little capacity.

実施例 第1図は、本発明の一実施例のブロック図である。同図
に示すように構成要素として、(1)は書換え可能な第
1の記憶装置、(2)は書換え不可能な第2の記憶装置
、(3)はデータの書換え頻度によって前記のどちらの
記憶装置に記憶するかを判別する判別装置である。
Embodiment FIG. 1 is a block diagram of an embodiment of the present invention. As shown in the figure, (1) is a rewritable first storage device, (2) is a non-rewritable second storage device, and (3) is either one of the above depending on the data rewriting frequency. This is a determination device that determines whether to store data in a storage device.

新たに入力されたデータは、書換え可能な記憶装置(1
)に記憶される。上記データは、一定回数のアクセスが
あるまでの期間、ひきつづき書換え可能な記憶装置(1
)内に記憶される。その回数のアクセスがあったとき、
判別装置(3)の検出手段が上記データへの一定回数の
アクセスのうち書き込みを行ったアクセスの割合をすな
わち、書換え頻度を検出し、一定割合に満たない場合に
は判別装置(3)の移動手段により上記データを書換え
可能な第1の記憶装置(1)から書換え不可能な第2の
記憶装置(2)にコピーした後、書換え可能な第1の記
憶装置(1)から消去する。すなわち書換え可能な第1
の記憶装置t (1)から書換え不可能な第2の記憶装
置(2)へ移動する。
Newly input data is stored in a rewritable storage device (1
). The above data is stored in a rewritable storage device (1
). When accessed that number of times,
The detection means of the discriminating device (3) detects the percentage of write accesses out of a certain number of accesses to the data, that is, the rewrite frequency, and if the frequency is less than a certain percentage, the discriminating device (3) is moved. After the data is copied from the rewritable first storage device (1) to the non-rewritable second storage device (2) by the means, it is erased from the rewritable first storage device (1). In other words, the first rewritable
from the storage device t (1) to the second non-rewritable storage device (2).

たとえば上記一定回数を10回、上記一定割合(書換え
頻度)を1/10としたとき、最初の10回のアクセス
がすべて読みだしのみのアクセスである場合のみ、上記
データが書換え可能な第1の記憶装置(1)から書換え
不可能な第2の記憶装置(2)に移動することになる。
For example, when the above fixed number of times is 10 and the above fixed ratio (rewrite frequency) is 1/10, only if the first 10 accesses are read-only accesses, the first rewritable data is The data will be moved from the storage device (1) to the second storage device (2) which cannot be rewritten.

あるデータに対するアクセスがあると、判別装置(3)
は上記データが書換え可能な第1の記憶装置(1)にあ
るか、書換え不可能な第2の記憶装置C)にあるかを判
別し、自動的にどちらかの記憶装置から上記データを取
り出す。
When there is access to certain data, the discrimination device (3)
determines whether the above data is in the rewritable first storage device (1) or the non-rewritable second storage device C), and automatically retrieves the above data from either storage device. .

書換え不可能な第2の記憶装置(2)にあるデータに対
して書き込みを行うアクセスがあった場合、判別装置(
3)は上記データを書換え不可能な第2の記憶装置(2
)から書換え可能な第1の記憶装置(1)に移動した後
、書換え不可能な第2の記憶装fit(2)のデータを
無効にする。このときにのみ書換え不可能な第2の記憶
装置(2)に使用できない領域が生ずる。
When there is a write access to data in the non-rewritable second storage device (2), the determination device (
3) is a second storage device (2) in which the above data cannot be rewritten.
) to the first rewritable storage device (1), and then invalidates the data in the second non-rewritable storage device (2). Only at this time does an unusable area arise in the non-rewritable second storage device (2).

このように、記憶装置の特徴を生かしたデータの記憶方
法を用いることにより、有効な記憶装置の利用が実現で
きる。
In this way, by using a data storage method that takes advantage of the characteristics of the storage device, effective use of the storage device can be realized.

なお、本実施例の各装置を計算器の記憶装置に対応させ
、プログラムで処理を実現しても上記効果が得られるこ
とは明らかである。
Note that it is clear that the above effects can be obtained even if each device of this embodiment is made to correspond to the storage device of a computer and the processing is realized by a program.

発明の効果 以上の説明から明らかなように本発明は、データの追加
時に書換え可能な記憶装置に記憶させ、その後判別装置
がデータの書換え頻度が一定値より低い場合を判別して
書換え不可能な記憶装置にデータを移動することにより
、書換え頻度が高いと予想されるデータが書換え可能な
記憶装置に、書換え頻度が低いと予想されるデータが書
換え不可能な記憶装置に記憶されるように構成したもの
である。これにより全体としてデータ量あたりのコスト
が安く信頼性が高く、かつ容量の浪費が少ないデータ記
憶装置が実現できる。
Effects of the Invention As is clear from the above description, the present invention stores data in a rewritable storage device when data is added, and then a discriminating device determines when the frequency of data rewriting is lower than a certain value and stores the data in a rewritable storage device. By moving data to a storage device, data that is expected to be rewritten frequently is stored in a rewritable storage device, and data that is expected to be rewritten infrequently is stored in a non-rewritable storage device. This is what I did. As a result, it is possible to realize a data storage device that has low cost per data amount, is highly reliable, and wastes little capacity.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例を示すブロック図である。 1・・・・・・第1の記憶装置、2・・・・・・第2の
記憶装置、3・・・・・・判別装置。 代理人の氏名 弁理士小鍜1h明 ほか2名簿 図 第1の名己11.狭1
FIG. 1 is a block diagram showing one embodiment of the present invention. 1...First storage device, 2...Second storage device, 3...Discrimination device. Name of agent: Patent attorney 1h Akira Koba and 2 other names List of names No. 1 11. Narrow 1

Claims (2)

【特許請求の範囲】[Claims] (1)書換え可能な第1の記憶装置と、 書換え不可能な第2の記憶装置と、 前記第1の記憶装置へのアクセス数と書換え数を検出し
、前記アクセス数に対する書換え頻度を算出する検出手
段と、 前記検出手段の出力にしたがい前記第1の記憶装置に記
憶されているデータの一部を、前記第2の記憶装置に移
動し記憶させる移動手段とを具備し、 新たに入力されたデータは前記第1の記憶装置に記憶さ
れるとともに、前記検出手段の出力が所定の値以下のデ
ータについては前記移動手段により前記第2の記憶装置
に移動されるようにしてなるデータ記憶装置。
(1) A rewritable first storage device, a non-rewritable second storage device, and detecting the number of accesses and the number of rewrites to the first storage device, and calculating the rewriting frequency with respect to the number of accesses. and a moving means for moving and storing a part of the data stored in the first storage device in the second storage device according to the output of the detection device, data is stored in the first storage device, and data for which the output of the detection means is less than or equal to a predetermined value is moved to the second storage device by the moving means. .
(2)移動手段は、第2の記憶装置に記憶されているデ
ータの中で書換え要求があったデータを、第1の記憶装
置に移動し記憶させるようにしてなる請求項1記載のデ
ータ記憶装置。
(2) The data storage device according to claim 1, wherein the moving means moves the data that has been requested to be rewritten among the data stored in the second storage device to the first storage device and stores the data. Device.
JP2264027A 1990-10-01 1990-10-01 Data storage device Pending JPH04141881A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2264027A JPH04141881A (en) 1990-10-01 1990-10-01 Data storage device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2264027A JPH04141881A (en) 1990-10-01 1990-10-01 Data storage device

Publications (1)

Publication Number Publication Date
JPH04141881A true JPH04141881A (en) 1992-05-15

Family

ID=17397536

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2264027A Pending JPH04141881A (en) 1990-10-01 1990-10-01 Data storage device

Country Status (1)

Country Link
JP (1) JPH04141881A (en)

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