JP2011154702A - コンピュータ・システムおよび多数の記憶装置および多数のアプリケーション間でスケーラブルにかつ信頼性高く多数の高帯域データ・ストリームを転送するプロセス - Google Patents
コンピュータ・システムおよび多数の記憶装置および多数のアプリケーション間でスケーラブルにかつ信頼性高く多数の高帯域データ・ストリームを転送するプロセス Download PDFInfo
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Abstract
【解決手段】データをセグメントに分割し、メディア・データの他のセグメントを格納した記憶装置には独立して、各セグメントを数個の記憶装置の1つにランダムに分散する。各セグメントに対応する冗長情報も、記憶装置間でランダムに分散する。セグメントに対する冗長情報は、セグメントのコピーとすることができ、各セグメントを少なくとも2つの記憶装置上に格納する。また、冗長情報は、2つ以上のセグメントに基づくことも可能である。このデータ・セグメントおよび対応する冗長情報のランダム分散により、スケーラビリティおよび信頼性双方の向上を図る。
【選択図】図1A
Description
コンピュータ・ネットワークを用いて、多数のアプリケーションと接続してある多数の記憶装置上にデータをランダムに分散する。データをセグメントに分割する。各セグメントを記憶装置の1つに格納する。また、1つ以上のセグメントに基づく冗長情報も、基本となるセグメントとは異なる記憶装置上に格納する。冗長情報は、各セグメントのコピーとすればよく、あるいは2つ以上のセグメントに対して行なう排他的OR演算によって計算してもよい。セグメントまたは冗長情報を格納した各記憶装置の選択はランダムまたは疑似ランダムであり、他のデータ・セグメントが格納されている記憶装置とは独立することができる。冗長情報が2つ以上のセグメントに基づく場合、セグメントの各々を異なる記憶装置上に格納する。
別の態様では、ビデオ・データ・ストリームを組み合わせて複合ビデオ・データを生成し、ビデオ・データを格納するための複数の記憶装置を備えた分散システムに格納する。記憶装置上に格納したビデオ・データのセグメントのコピーを、複数の記憶装置間でランダムに分散する。ビデオ・データ・ストリームを含むの記憶装置から読み出す。これらのビデオ・データ・ストリームを組み合わせて、複合ビデオ・データを生成する。複合ビデオ・データをセグメントに分割する。複合ビデオ・データのセグメントのコピーを、複数の記憶装置間でランダムに分散する。データの読み取りおよび格納は、ここに記載する技法を用いて行なうことができる。
s=メガバイト(MB)単位での失われたデータのサイズ
n=記憶装置の初期数
b=MB単位での1秒当たりの記憶装置の平均帯域幅
MTBF=故障間平均時間
MTTR=故障または交換までの平均時間
MTDF=二重故障不良の平均時間
SMTBF=故障間の全システム平均時間
とすると、
一例として、100個の記憶装置を有し、各々50ギガバイトの容量を有するシステムでは、MTTRが1時間、MTBFが1000時間即ち6週間の場合、115年で二重故障不良が発生する確度となる。MTTRが24時間に増大すると、4.8年で二重故障不良が発生する確度となる。
s=メガバイト単位(MB)で示す、失われたデータのサイズ
n=記憶装置の初期数
b=MB/秒で表わす、記憶装置の平均帯域幅
d=MB/秒で表わす、ユーザ・デマンドの負荷
例えば、10個の記憶装置の内1つが故障したために50ギガバイトのストレージへのアクセスが失われた場合、n=10記憶装置、単位帯域幅b=10MB/秒とすると、(n−1)=9および(b/2)=5となる。したがって、他に負荷がなければ、復元には約20分を要する。この絶対復元速度は、通常、クライアントへの変動再生負荷の逆数として減少する。例えば、50%負荷の場合、入力時間は200%増大する。呼び出されると、再分散タスクは速いレートで実行することができ、多元記憶装置チェッカボードを多数の記憶装置に切り替えるが、再入力アクティビティは適宜クライアント・ファイル・サービス要求にしたがって行われる。実際の影響は、故障した記憶装置によって記憶装置の全帯域幅に多少の損失が出る程度である。復元のためのファイル選択の優先順位を決定することにより、最も重要なファイルを真っ先に復元することを保証する。
Claims (37)
- データを格納するための複数の記憶装置からなり、前記記憶装置上に格納したデータ・セグメントおよび対応する冗長情報を前記複数の記憶装置間でランダムに分散する、分散データ記憶システム。
- セグメントに対応する前記情報性情報は、当該セグメントのコピーである、請求項1記載の分散データ記憶システム。
- 各セグメントの各コピーを前記記憶装置の異なるものに格納する請求項2記載の分散記憶システム。
- 各セグメントの各コピーは、前記記憶装置の相対的仕様の関数として定義した確率分布にしたがって、前記複数の記憶装置の1つに割り当てられる請求項3記載の分散データ記憶システム。
- 更に、コンピュータ読み取り可能ロジックを格納し、データ・セグメントの指示を用いてコンピュータによるアクセスが可能なセグメント・テーブルを定義するコンピュータ読み取り可能媒体を備え、前記セグメントおよび対応する冗長情報を格納した前記複数の記憶装置から、該記憶装置の指示を検索する請求項1記載の分散データ記憶システム。
- 前記複数の記憶装置が、
コンピュータ・ネットワークに接続した第1記憶装置と、
前記コンピュータ・ネットワークに接続した第2記憶装置と、
前記コンピュータ・ネットワークに接続した第3記憶装置と、
を備える請求項1記載の分散データ記憶システム。 - セグメントに対応する前記冗長情報は、2つ以上のセグメントに基づく請求項1記載の分散データ記憶システム。
- 前記2つ以上のセグメントおよび前記冗長情報を前記記憶装置の異なるものに格納する請求項7記載の分散データ記憶システム。
- コンピュータ用ファイル・システムであって、前記コンピュータが、当該コンピュータ上で実行するアプリケーションからの要求に応答してコンピュータ・ネットワークを通じて独立したリモート記憶装置にアクセスし、前記記憶装置上に格納してあるデータを読み出すことを可能とし、前記データのセグメントおよび対応する冗長情報を前記複数の記憶装置間でランダムに分散するファイル・システムにおいて、
前記要求に応答してデータを読み出し、前記選択したデータの各セグメント毎に、前記セグメントを格納する記憶装置を特定する手段と、
前記要求したデータの各セグメントを、当該セグメントに対して特定した記憶装置から、読み出す手段と、
前記特定した記憶装置からデータを受信したとき、前記アプリケーションに前記データを供給する手段と、を備えるファイル・システム。 - セグメントに対応する前記冗長情報は前記セグメントのコピーであり、前記セグメントを記憶する前記記憶装置を特定する前記手段は、前記選択したデータの各セグメント毎に、当該セグメントを格納する記憶装置の1つを選択する手段を含む請求項9記載のファイル・システム。
- 前記記憶装置の1つを選択する手段は、前記複数の記憶装置上の要求の負荷が実質的に均衡するように記憶装置を選択することを特徴とする請求項10記載のファイル・システム。
- 前記選択手段は、前記セグメントのためのどの記憶装置が、前記要求に応じるための推定時間が最も短いかについての推定に基づいて、前記セグメントのための前記記憶装置を選択する請求項11記載のファイル・システム。
- 前記選択手段が、前記ファイル・システムにおいて、
前記記憶装置の1つからデータを要求し、推定時間を示す手段と、
前記第1記憶装置が前記要求を拒絶した場合、前記記憶装置の他のものからデータを要求し、推定時間を示す手段と、
前記第2記憶装置が前記要求を拒絶した場合、前記第1記憶装置から前記データを要求する手段と、
を含み、各記憶装置において、
前記要求が前記推定時間以内に前記記憶装置によって対応することができない場合、データの要求を拒絶する手段と、
前記要求が前記推定時間以内に前記記憶装置によって対応することができる場合、データの要求を受け入れる手段と、
を含む請求項12記載のファイル・システム。 - 各セグメントを読み出す前記手段は、前記選択した記憶装置からの前記データの転送をスケジュールし、前記記憶装置が効率的にデータ転送を行なうようにする手段を備える請求項11記載のファイル・システム。
- 転送をスケジュールする前記手段は、
前記ファイル・システムにおいて、
前記選択した記憶装置から前記データの転送を要求し、待ち時間を示す手段と、
前記選択した記憶装置が前記データを転送する前記要求を拒絶した場合、別の記憶装置から前記データを要求する手段と、
を含み、
前記記憶装置において、
前記データが前記指示した待ち時間までに前記記憶装置から転送することができない場合、データ転送要求を拒絶する手段と、
前記選択した記憶装置が前記待ち時間以内に前記データを転送することができる場合、前記データを転送する手段と、
を含む請求項14記載のファイル・システム。 - 各セグメントを読み出す前記手段は、前記選択した記憶装置からの前記データの転送をスケジュールし、前記記憶装置が効率的にデータ転送を行なうようにする手段を備える請求項9記載のファイル・システム。
- 各セグメントを読み出す前記手段は、前記選択した記憶装置からの前記データの転送をスケジュールし、前記記憶装置が効率的にデータ転送を行なうようにする手段を備える請求項7記載のファイル・システム。
- 転送をスケジュールする前記手段は、
前記ファイル・システムにおいて、
前記選択した記憶装置から前記データの転送を要求し、待ち時間を示す手段と、
前記選択した記憶装置が前記データを転送する前記要求を拒絶した場合、別の記憶装置から前記データを要求する手段と、
を含み、
前記記憶装置において、
前記データが前記指示した待ち時間までに前記記憶装置から転送することができない場合、データ転送要求を拒絶する手段と、
前記選択した記憶装置が前記待ち時間以内に前記データを転送することができる場合、前記データを転送する手段と、
を含む請求項17記載のファイル・システム。 - 前記データを複数のセグメントに分割し、各セグメントをコピーし、各セグメントの各コピーを前記記憶装置の異なるものに格納する請求項10記載のファイル・システム。
- 各セグメントの各コピーを、前記記憶装置の相対的仕様の関数として定義した確率分布にしたがって、前記複数の記憶装置の1つに割り当てる請求項19記載のファイル・システム。
- 更に、コンピュータ読み取り可能ロジックを格納し、データ・セグメントの指示を用いてコンピュータによるアクセスが可能なセグメント・テーブルを定義するコンピュータ読み取り可能媒体を備え、前記セグメントおよび対応する冗長情報を格納した前記複数の記憶装置から、該記憶装置の指示を検索する請求項9記載のファイル・システム。
- 前記複数の記憶装置が、
前記コンピュータ・ネットワークに接続した第1記憶装置と、
前記コンピュータ・ネットワークに接続した第2記憶装置と、
前記コンピュータ・ネットワークに接続した第3記憶装置と、
を備える請求項9記載のファイル・システム。 - セグメントに対応する前記冗長情報は、2つ以上のセグメントに基づく請求項9記載の分散データ記憶システム。
- 前記冗長情報および該冗長情報の基となる前記2つ以上のセグメントは、各々前記記憶装置の異なる1つに記憶されている請求項23記載のファイル・システム。
- コンピュータ用ファイル・システムであって、前記コンピュータが、当該コンピュータ上で実行するアプリケーションからの、要求に応答してコンピュータ・ネットワークを通じて独立したリモート記憶装置にアクセスし、前記記憶装置上にデータを格納することを可能とするファイル・システムにおいて、
前記データを格納する前記要求に応答して、前記データを複数のセグメントに分割する手段と、
各セグメントおよび該セグメントに対応する冗長情報を前記複数の記憶装置間でランダムに分散する手段と、
前記データを格納したか否かについて前記アプリケーションに確証する手段と、
を備えるファイル・システム。 - セグメントに対応する前記冗長情報は当該セグメントのコピーである請求項25記載のファイル・システム。
- 前記ランダムに分散する手段は、
各セグメント毎に、ランダムにかつ他のセグメントのために選択した記憶装置とは独立して、少なくとも2つの前記記憶装置を選択する手段と、
前記選択した記憶手段に、各セグメントに対するデータを格納するように要求する手段と、
を備える請求項26記載のファイル・システム。 - 前記選択する手段は、前記記憶装置の部分集合を選択する手段と、前記選択した部分集合内にある前記記憶装置の中から少なくとも2つの前記記憶装置を選択する手段とを含む請求項27記載のファイル・システム。
- 各セグメントの各コピーは、前記記憶装置の相対的仕様の関数として定義した確率分布にしたがって、前記複数の記憶装置の1つに割り当てられる請求項27記載のファイル・システム。
- 更に、コンピュータ読み取り可能ロジックを格納し、データ・セグメントの指示を用いてコンピュータによるアクセスが可能なセグメント・テーブルを定義するコンピュータ読み取り可能媒体を備え、前記セグメントおよび対応する冗長情報を格納した前記複数の記憶装置から、該記憶装置の指示を検索する請求項25記載のファイル・システム。
- 前記複数の記憶装置が、
前記コンピュータ・ネットワークに接続した第1記憶装置と、
前記コンピュータ・ネットワークに接続した第2記憶装置と、
前記コンピュータ・ネットワークに接続した第3記憶装置と、
を備える請求項25記載のファイル・システム。 - セグメントに対応する前記冗長情報は、2つ以上のセグメントに基づく請求項25記載の分散データ記憶システム。
- 前記冗長情報および該冗長情報の基となる前記2つ以上のセグメントは、各々前記記憶装置の異なる1つに記憶されている請求項32記載のファイル・システム。
- データを格納するための複数の記憶装置を備えた分散データ記憶システムにおいてデータを復元するプロセスであって、前記記憶装置上に格納した前記データのセグメントおよび対応する冗長情報は、前記複数の記憶装置間にランダムに分散してあり、前記プロセスは、前記記憶装置の1つの故障が検出されたときに実行され、
前記故障した記憶装置上に格納してあったコピーのセグメントを特定するステップと、
前記特定したセグメントに対応する前記冗長情報を格納した記憶装置を特定するステップと、
前記複数の記憶装置間において、前記特定した冗長情報に応じて前記特定したセグメントをランダムに分散するステップと、
からなるプロセス。 - セグメントに対応する前記冗長情報は当該セグメントのコピーであり、
記憶装置を特定する前記ステップは、前記特定したセグメントの別のコピーがストレージであった記憶装置を特定するステップを含み、
ランダムに分散する前記ステップは、前記特定した記憶装置からの前記特定したコピーのコピーを前記複数の記憶装置間でランダムに分散するステップを含む、
請求項24記載のプロセス。 - セグメントに対応する前記冗長情報は、2つ以上のセグメントに基づき、更に、
前記特定したセグメントに対応する前記冗長情報にしたがって、前記特定したセグメントを再構成するステップを含み、
前記ランダムに分散するステップは、前記再構成した特定セグメントを前記複数の記憶装置間で分散するステップを含む、
請求項34記載のプロセス。 - ビデオ・データ・ストリームを組み合わせて複合ビデオ・データを生成し、ビデオ・データを格納するための複数の記憶装置を備えた分散システムに前記複合ビデオ・データを格納するプロセスであって、前記記憶装置上に格納した前記ビデオ・データのセグメントおよび対応する冗長情報を、前記複数の記憶装置間でランダムに分散する際に、
前記複数の記憶装置から前記ビデオ・データ・ストリームを読み出すステップと、
前記ビデオ・データ・ストリームを組み合わせ、前記複合ビデオ・データを生成するステップと、
前記複合ビデオ・データをセグメントに分割するステップと、
前記複合ビデオ・データのセグメントおよび対応する冗長情報を前記複数の記憶装置間でランダムに分散するステップと、
からなるプロセス。
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JP2009059357A (ja) | 2009-03-19 |
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US8984223B2 (en) | 2015-03-17 |
US7111115B2 (en) | 2006-09-19 |
US8478957B2 (en) | 2013-07-02 |
US20160028823A1 (en) | 2016-01-28 |
US20120239892A1 (en) | 2012-09-20 |
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