JP2008518284A - 固定内容分散データ記憶のためのメタデータ管理 - Google Patents
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Abstract
Description
メタデータ管理
・ExternalFile:アーカイブのユーザによって読取られるファイル;
・InternalFile:ストレージ・マネジャーによって記憶されているファイル;尚、External FilesとInternal Filesの間には1つまたは2つ以上の関係が存在するのが普通である。
・ConfigObject:クラスタの構成に使用される名前/値ペア;
・AdminLogEntry:管理UIに表示されるメッセージ;
・MetricsObject:ある時点における(例えば、ファイル数のような)アーカイブの大きさを表す時刻印されたキー/値ペア;
・PolicyState:あるポリシーの違反。
云うまでもなく、上記オブジェクトは説明の便宜上挙げた例であり、本発明の範囲を制限するものではない。
それぞれのバックアップ領域マネジャーのためにローカル・データベースを更新し、
データベース更新をコミットし、
バックアップ領域マネジャーに対してバックアップ・リクエストを送信し、
バックアップ・リクエストの確認を待ち、
管理を呼び出し側に戻す
バックアップ・リクエストに時間切れの規定はない。バックアップRGMからの異議が遠隔ノードが故障したことを示唆する。管理エンジンがこの異議に気付き、MMリーダーにこの故障を知らせる。その結果、他の場所に新しい不完全領域コピーが創成される。次いで、この不完全領域コピーを記述する新しい領域マップが分散させられる。従って、認証RGMはこの異議を無視することができる。
これらの必要条件のそれぞれを以下に説明する。
Claims (20)
- それぞれがオブジェクトに基づくストレージを提供するアプリケーション・インスタンスを実行し、全体としてネットワークを構成する独立ノード冗長アレイにおけるメタデータ管理方法であって、
アレイ全体に亘って分散させた領域群にメタデータ・オブジェクトを記憶させ、メタデータ・オブジェクト属性をハッシュし、得られたハッシュ値の所与のビット組み合わせを抽出することによって所与の領域を同定し;
領域毎に、領域の認証コピーを記憶することによってこの領域に向けられる更新リクエストを受信してこれに回答するノードを同定するとともに、それぞれが領域のバックアップ・コピーを記憶することによって認証領域コピーに対するバックアップ領域コピーとして作用できるゼロまたは1つ以上のノードを同定するマップを作成し;
それぞれのノードがメタデータ・オブジェクトの記憶位置を示す同一のグローバル・ビューを有するように独立ノード・アレイ全体にマップを分散させ;
所与のメタデータ・オブジェクトの更新リクエストを受信すると、マップを利用してメタデータ・オブジェクトに対応する認証領域コピーを同定し;
更新リクエストを処理し;
更新を処理しながら、認証領域コピーとこれと関連するバックアップ領域コピーとの同期関係を維持できなければ、新しいマップを発信するステップを含むことを特徴とする前記メタデータ管理方法。 - 領域の認証コピーに更新をコミットさせ、領域のゼロまたは1つ以上のバックアップ・コピーのそれぞれに向けて更新リクエストを発信することを特徴とする請求項1に記載の方法。
- バックアップ・リクエストがコミットされるか否かに拘らず、更新リクエストを受信するとバックアップ領域から確認が発信されることを特徴とする請求項2に記載の方法。
- バック領域コピーまたは認証領域コピーと関連する故障のため同期関係を維持できないことを特徴とする請求項1に記載の方法。
- 独立ノード数が増大するのに伴って、増分的にマップを区分するステップをも含むことを特徴とする請求項1に記載の方法。
- 所与の第2ハッシュ値を不変に維持しながら、所与の第1ハッシュ値を調整することによってマップを増分的に区分することを特徴とする請求項5に記載の方法。
- ハッシュ値にビットを加えることによって所与の第1ハッシュ値を調整することを特徴とする請求項6に記載の方法。
- 領域コピーをノード全体に分散させることによってノード毎の認証領域コピー数をバランスさせることを特徴とする請求項1に記載の方法。
- 領域コピーをノード全体に分散させることによってノード毎の認証領域コピー数をバランスさせるとともに、ノードごとの領域コピーの総数をバランスさせることを特徴とする請求項1に記載の方法。
- 所与の領域のバックアップ・コピー数が設定可能であることを特徴とする請求項1に記載の方法。
- 新しいマップを発行するステップがバックアップ領域を認証領域コピーに昇格させるステップを含むことを特徴とする請求項1に記載の方法。
- 領域が不完全領域コピーをも含み、不完全領域コピーがバックアップ領域コピーに昇格するには不適格であることを特徴とする請求項11に記載の方法。
- 新しいマップを発行するステップが領域コピーを削除するステップ、領域コピーを創成するステップ、バックアップ領域コピーを認証領域コピーに昇格させるステップ、不完全領域コピーをバックアップ領域コピーに昇格させるステップ、認証領域コピーをバックアップ領域コピーに降格させるステップのいずれか1つを含むことを特徴とする請求項1に記載の方法。
- ネットワークを構成する冗長独立ノード・アレイにおいて、アレイ全体に分散させた領域群にメタデータ・オブジェクトを記憶させ、メタデータ・オブジェクト属性をハッシュし、得られたハッシュ値の所与のビット群を抽出することによって所与の領域を同定する方法であって、
領域毎に、領域の認証コピーを記憶することによってこの領域に向けられる更新リクエストを受信してこれに回答するノードを同定するとともに、それぞれが領域のバックアップ・コピーを記憶することによって認証領域コピーに対するバックアップ領域コピーとして作用できるゼロまたは1つ以上のノードを同定するマップを作成し;
それぞれのノードがメタデータ・オブジェクトの記憶場所を示す同一のグローバル・ビューを記憶するように独立ノード・アレイ全体に亘ってマップを分散させ、所与の認証領域コピーとこれと連携するゼロまたは1つ以上のバック領域コピーが同期関係にあることを保証するようにマップを構成し;
同期関係を維持できなければ、新しいマップを発行し、アレイ全体に亘って新しいマップを分散させるステップを含むことを特徴とする前記方法。 - 故障の結果として領域に認証領域コピーがなくなると、マップが所与の領域においてバックアップ領域コピーを認証領域コピーに昇格させることを特徴とする請求項14に記載の方法。
- 領域が設定可能なバックアップ領域コピー数よりも多くなると、新しいマップが余剰のバックアップ領域コピーを削除することを特徴とする請求項14に記載の方法。
- または昇格の結果として領域が設定可能なバックアップ領域コピー数よりも少なくなると、新しいマップが新しい不完全領域コピーを創成することを特徴とする請求項14に記載の方法。
- 新しいマップが領域コピーを1つのノードから他のノードへ配置換えすることを特徴とする請求項14に記載の方法。
- 配置換えされる領域コピーが認証領域コピーであることを特徴とする請求項18に記載の方法。
- アレイ全体に分散させた領域群にメタデータ・オブジェクトを記憶させ、メタデータ・オブジェクト属性をハッシュし、得られたハッシュ値の所与のビット群を抽出することによって所与の領域を同定するように構成されたネットワークを構成する冗長独立ノード・アレイであって、
バーチャル・マシンと;
データベースと;
それぞれの領域について、領域の認証コピーを記憶することによって領域に向けられる更新リクエストを受信し、且つこれに応答するノードを同定するとともに、それぞれが領域のバックアップ領域を記憶することによって認証領域コピーに対するバックアップ領域コピーとして作用することができるゼロまたは1つ以上のノードを同定するようにデータベースに記憶されているマップと;
所与の領域コピーがそれ自体の領域マネジャー・プロセスと連携するようにバーチャル・マシンにおいて実行される1つまたは2つ以上の領域マネジャー・プロセスと;
1つまたは2つ以上の領域マネジャー・プロセスを発生させ、且つ管理するためのメタデータ・マネジャー・プロセスと;
更新リクエストを受信し、これに応答するクライエント・プロセスを含むことを特徴とする前記冗長独立ノード・アレイ。
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US11/190,402 US7657581B2 (en) | 2004-07-29 | 2005-07-27 | Metadata management for fixed content distributed data storage |
PCT/US2005/026747 WO2006015097A2 (en) | 2004-07-29 | 2005-07-28 | Metadata management for fixed content distributed data storage |
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US7657581B2 (en) | 2010-02-02 |
WO2006015097A3 (en) | 2008-02-21 |
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US20060026219A1 (en) | 2006-02-02 |
WO2006015097A2 (en) | 2006-02-09 |
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EP1782289A4 (en) | 2010-04-07 |
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