JPH06504863A - コピーバックキャッシュを有する記憶装置アレイ - Google Patents
コピーバックキャッシュを有する記憶装置アレイInfo
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- G06F11/08—Error detection or correction by redundancy in data representation, e.g. by using checking codes
- G06F11/10—Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
- G06F11/1076—Parity data used in redundant arrays of independent storages, e.g. in RAID systems
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- G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
- G06F11/2053—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where persistent mass storage functionality or persistent mass storage control functionality is redundant
- G06F11/2094—Redundant storage or storage space
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- G11B20/1833—Error detection or correction; Testing, e.g. of drop-outs by adding special lists or symbols to the coded information
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
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- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1415—Saving, restoring, recovering or retrying at system level
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/16—Error detection or correction of the data by redundancy in hardware
- G06F11/20—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
- G06F11/2053—Error detection or correction of the data by redundancy in hardware using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements where persistent mass storage functionality or persistent mass storage control functionality is redundant
- G06F11/2089—Redundant storage control functionality
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/02—Addressing or allocation; Relocation
- G06F12/08—Addressing or allocation; Relocation in hierarchically structured memory systems, e.g. virtual memory systems
- G06F12/0802—Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches
- G06F12/0866—Addressing of a memory level in which the access to the desired data or data block requires associative addressing means, e.g. caches for peripheral storage systems, e.g. disk cache
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2211/00—Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
- G06F2211/10—Indexing scheme relating to G06F11/10
- G06F2211/1002—Indexing scheme relating to G06F11/1076
- G06F2211/1019—Fast writes, i.e. signaling the host that a write is done before data is written to disk
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2211/00—Indexing scheme relating to details of data-processing equipment not covered by groups G06F3/00 - G06F13/00
- G06F2211/10—Indexing scheme relating to G06F11/10
- G06F2211/1002—Indexing scheme relating to G06F11/1076
- G06F2211/1059—Parity-single bit-RAID5, i.e. RAID 5 implementations
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Abstract
Description
Claims (1)
- 【特許請求の範囲】 1.以下を備えるフォールトトレラント記憶装置アレイ。 a.少なくともデータブロック及びこれに対応する誤り訂正ブロックを含む一般 に複数のブロックにより構成されたストライプの形式で、情報を記憶する障害か ら独立した複数個の記憶ユニット b.データブブックを一時記憶する少なくとも1個のコピーバックキャッシュ記 憶ユニット c.上記複数個の記憶ユニット及び上記少なくとも1個のコピーバックキャッシ ュ記憶ユニットに接続され、機能(1)〜(3)を有する制御手段を含む記憶ユ ニットコントローラ (1)受信したデータブロックを上記少なくとも1個のコピーバックキャッシュ 記憶ユニット上にペンディングデータブロックとして初期的に書き込む機能 (2)上記複数個の記憶ユニットのうち少なくともいずれかの記憶ユニットのア イドルタイムにおいて処理(a)〜(c)を実行する機能(a)少なくとも1個 のベンディングデータブロックを、少なくとも1個のコピーバックキャッシュ記 憶ユニットから読み出す処理(b)各ペンディングデータブロックに対応する誤 り訂正ブロックを生成する処理 (c)読み出されたペンディングデータブロック及びこれに対応する誤り訂正ブ ロックを、アイドル状態にある記憶ユニット上の対応するストライプに書き込む 処理 (3)要求されたデータブロックが上記複数の記憶ユニット上に書き込まれてい ないときに、当該要求されたデータブロックを、少なくとも1個のコピーバック キャッシュ記憶ユニットから読み出し、それ以外の場合には上記複数の記憶ユニ ットから読み出す機能2.請求項1記載の記憶装置アレイにおいて、上記少なく とも1個のコピーバックキャッシュ記憶ユニットに対する受信記録の書き込みが 終了したことを、制御手段が実質的に瞬時に確認する記憶装置アレイ。 3.請求項1記載の記憶装置アレイにおいて、制御手段により実行される処理の うち、各ペンディングデータブロックに対応する誤り訂正ブロックを生成する処 理が、さらに、新たな誤り訂正ブロックを、上記少なくとも1個のペンディング ブロック並びに上記アイドル状態にある記憶ユニットの対応するストライプから 読み出された対応する古い誤り訂正ブロック及び対応する古いデータブロックの 関数として生成する処理を実行する記憶装置アレイ。 4.請求項3記載の記憶装置アレイにおいて、上記新たな誤り訂正ブロックを生 成する処理が、さらに以下の処理を含む記憶装置アレイ。 a.上記アイドル状態にある記憶ユニットの対応するストライプから対応する古 いデータブロックを読み出す処理 b.上記アイドル状態にある記憶ユニットの対応するストライプから対応する古 い誤り訂正ブロックを読み出す処理 c.上記古いデータブロック、上記古い誤り訂正ブロック及び上記ペンディング データブロックの排他的論理和を演算することにより、上記新たな誤り訂正ブロ ックを生成する処理 5.フェイルと独立な複数個の記憶ユニットを備え、当該複数個の記憶ユニット が少なくともデータブロック及びこれに対応する誤り訂正ブロックを含む一般に 複数のブロックにより構成されたストライプの形式で情報を記憶するフォールト トレラント記憶装置アレイに、以下のステップによりデータを記憶する方法。 a.データブロックを一時記憶する少なくとも1個のコピーバックキャッシュ記 憶ユニットを設けるステップ b.受信したデータブロックを上記少なくとも1個のコピーバックキャッシュ記 憶ユニット上にペンディングデータブロックとして初期的に書き込むステップc .上記複数個の記憶ユニットのうち少なくともいずれかの記憶ユニットのアイド ルタイムにおいて処理(1)〜(3)を実行するステップ(1)少なくとも1個 のペンディングデータブロックを、少なくとも1個のコピーバックキャッシュ記 憶ユニットから読み出す処理(2)各ペンディングデータブロックに対応する誤 り訂正ブロックを生成する処理 (3)読み出されたペンディングデータブロック及びこれに対応する誤り訂正ブ ロックを、アイドル状態にある記憶ユニット上の対応するストライプに書き込む 処理 d.要求されたデータブロックが上記複数の記憶ユニット上に書き込まれていな いときに、当該要求されたデータブロックを、少なくとも1個のコピーバックキ ャッシュ記憶ユニットから読み出し、それ以外の場合には上記複数の記憶ユニッ トから読み出すステップ 6.請求項5記載の方法において、上記少なくとも1個のコピーバックキャッシ ュ記憶ユニットに対する受信記録の書き込みが終了したことを実質的に瞬時に確 認するステップを含む方法。 7.請求項5記載の方法において、各ペンディングデータブロックに対応する誤 り訂正ブロックを生成する処理が、さらに、以下の処理を含む方法。 a.上記新たな誤り訂正ブロックを、上記少なくとも1個のペンディングブロッ ク並びに上記アイドル状態にある記憶ユニットの対応するストライプから読み出 された対応する古い誤り訂正ブロック及び対応する古いデータブロックの関数と して生成する処理 8.請求項7記載の方法において、上記新たな誤り訂正ブロックを生成する処理 が、さらに以下の処理を含む方法。 a.上記アイドル状態にある記憶ユニットの対応するストライプから対応する古 いデータブロックを読み出す処理 b.上記アイドル状態にある記憶ユニットの対応するストライプから対応する古 い誤り訂正ブロックを読み出す処理 c.上記古いデータブロック、上記古い誤り訂正ブロック及び上記ベンディング データブロックの排他的論理和を演算することにより、上記新たな誤り訂正ブロ ックを生成する処理 9.以下を備えるフォールトトレラント記憶装置アレイ。 a.少なくともデータブロック及びこれに対応する誤り訂正ブロックを含む一般 に複数のブロックにより構成されたストライプの形式で、情報を記憶する障害か ら独立した複数個の記憶ユニット b.データブロックを一時記憶する少なくとも1個のコピーバックキャッシュ記 憶ユニット c.上記複数個の記憶ユニット及び上記少なくとも1個のコピーバックキャッシ ュ記憶ユニットに接続され、バッファメモリ及び機能(1)〜(4)を有する制 御手段を含む記憶ユニットコントローラ(1)受信したデータブロックを上記少 なくとも1個のコピーバックキャッシュ記憶ユニット上に初期的に書き込む機能 (2)受信したデータブロックをバッファメモリにペンディングデータブロック として記憶する機能 (3)上記複数個の記憶ユニットのうち少なくともいずれかの記憶ユニットのア イドルタイムにおいて処理(a)〜(c)を実行する機能(a)バッファメモリ 上の少なくとも1個のペンディングデータブロックにアクセスする処理 (b)各ベンディングデータブロックに対応する誤り訂正ブロックを生成する処 理 (c)アクセスされたペンディングデータブロック及びこれに対応する誤り訂正 ブロックを、アイドル状態にある記憶ユニット上の対応するストライプに書き込 む処理 (4)要求されたデータブロックが上記複数の記憶ユニット上に書き込まれてい ないときに、当該要求されたデータブロックを、バッファメモリから読み出し、 それ以外の場合には上記複数の記憶ユニットから読み出す機能10.請求項9記 載の記憶装置アレイにおいて、上記少なくとも1個のコピーバックキャッシュ記 憶ユニットに対する受信記録の書き込みが終了したことを、制御手段が実質的に 瞬時に確認する記憶装置アレイ。 11.請求項9記載の記憶装置アレイにおいて、制御手段により実行される処理 のうち、各ペンディングデータブロックに対応する誤り訂正ブロックを生成する 処理が、さらに、新たな誤り訂正ブロックを、上記少なくとも1個のペンディン グブロック並びに上記アイドル状態にある記憶ユニットの対応するストライプか ら読み出された対応する古い誤り訂正ブロック及び対応する古いデータブロック の関数として生成する処理を実行する記憶装置アレイ。 12.請求項11記載の記憶装置アレイにおいて、上記新たな誤り訂正ブロック を生成する処理が、さらに以下の処理を含む記憶装置アレイ。 a.上記アイドル状態にある記憶ユニットの対応するストライプから対応する古 いデータブロックを読み出す処理 b.上記アイドル状態にある記憶ユニットの対応するストライプから対応する古 い誤り訂正ブロックを読み出す処理 c.上記古いデータブロック、上記古い誤り訂正ブロック及び上記ペンディング データブロックの排他的論理和を演算することにより、上記新たな誤り訂正ブロ ックを生成する処理 13.請求項9記載の記憶装置アレイにおいて、バッファメモリから上記複数個 の記憶ユニットヘの全ての対応するデータブロックの書き込みに際して記憶ユニ ットコントローラにフェイルが発生したときに、上記少なくとも1個のコピーバ ックキャッシュ記憶ユニットから選択されたデータブロックを読み出し、この選 択されたデータブロックを上記複数個の記憶ユニットに書き込む手段を含む記憶 装置アレイ。 14.障害から独立した複数個の記憶ユニットを備え、当該複数個の記憶ユニッ トが少なくともデータブロック及びこれに対応する誤り訂正ブロックを含む一般 に複数のブロックにより構成されたストライプの形式で情報を記憶するフォール トトレラント記憶装置アレイに、以下のステップによりデータを記憶する方法。 a.バッファメモリ及びデータブロックを一時記憶する少なくとも1個のコピー バックキャッシュ記憶ユニットを設けるステップb.受信したデータブロックを 上記少なくとも1個のコピーバックキャッシュ記憶ユニット上に初期的に書き込 むステップc.受信したデータブロックをバッファメモリにペンディングデータ ブロックとして一時記憶させるステップ d.上記複数個の記憶ユニットのうち少なくともいずれかの記憶ユニットのアイ ドルタイムにおいて処理(1)〜(3)を実行するステップ(1)バッファメモ リ上の少なくとも1個のペンディングデータブロックにアクセスする処理 (2)各ベンディングデータブロックに対応する誤り訂正ブロックを生成する処 理 (3)アクセスされたベンディングデータブロック及びこれに対応する誤り訂正 ブロックを、アイドル状態にある記憶ユニット上の対応するストライプに書き込 む処理 e.要求されたデータブロックが上記複数の記憶ユニット上に書き込まれていな いときに、当該要求されたデータブロックをバッファメモリから読み出し、それ 以外の場合には上記複数の記憶ユニットから読み出すステップ15.請求項14 記載の方法において、上記少なくとも1個のコピーバックキャッシュ記憶ユニッ トに対する受信記録の書き込みが終了したことを、制御手段が実質的に瞬時に確 認するステップを含む方法。 16.請求項14記載の方法において、各ベンディングデータブロックに対応す る誤り訂正ブロックを生成する処理が、以下の処理を含む方法。 a.新たな誤り訂正ブロックを、上記少なくとも1個のペンディングブロック並 びに上記アイドル状態にある記憶ユニットの対応するストライプから読み出され た対応する古い誤り訂正ブロック及び対応する古いデータブロックの関数として 生成する処理 17.請求項16記載の方法において、上記新たな誤り訂正ブロックを生成する 処理が、さらに以下の処理を含む方法。 a.上記アイドル状態にある記憶ユニットの対応するストライプから対応する古 いデータブロックを読み出す処理 b.上記アイドル状態にある記憶ユニットの対応するストライプから対応する古 い誤り訂正ブロックを読み出す処理 c.上記古いデータブロック、上記古い誤り訂正ブロック及び上記ペンディング データブロックの排他的論理和を演算することにより、上記新たな誤り訂正ブロ ックを生成する処理 18.請求項14記載の方法において、バッファメモリから上記複数個の記憶ユ ニットヘの全ての対応するデータブロックの書き込みに際して記憶ユニットコン トローラにフェイルが発生したときに、上記少なくとも1個のコピーバックキャ ッシュ記憶ユニットから選択されたデータブロックを読み出し、この選択された データブロックを上記複数個の記憶ユニットに書き込む手段を含む記憶装置アレ イ。
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JPH06504863A true JPH06504863A (ja) | 1994-06-02 |
JP3129732B2 JP3129732B2 (ja) | 2001-01-31 |
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EP (1) | EP0493984B1 (ja) |
JP (1) | JP3129732B2 (ja) |
AU (1) | AU1001492A (ja) |
CA (1) | CA2058734C (ja) |
DE (1) | DE69126416T2 (ja) |
WO (1) | WO1992012482A1 (ja) |
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1991
- 1991-01-04 US US07/638,167 patent/US5274799A/en not_active Expired - Lifetime
- 1991-12-31 DE DE69126416T patent/DE69126416T2/de not_active Expired - Lifetime
- 1991-12-31 EP EP91312104A patent/EP0493984B1/en not_active Expired - Lifetime
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1992
- 1992-01-02 AU AU10014/92A patent/AU1001492A/en not_active Abandoned
- 1992-01-03 JP JP04504448A patent/JP3129732B2/ja not_active Expired - Lifetime
- 1992-01-03 WO PCT/US1992/000059 patent/WO1992012482A1/en unknown
- 1992-01-03 CA CA002058734A patent/CA2058734C/en not_active Expired - Lifetime
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1993
- 1993-08-26 US US08/112,791 patent/US5526482A/en not_active Expired - Lifetime
-
1995
- 1995-12-27 US US08/579,545 patent/US5617530A/en not_active Expired - Lifetime
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1997
- 1997-03-31 US US08/825,625 patent/US5911779A/en not_active Expired - Lifetime
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DE69126416T2 (de) | 1998-02-05 |
EP0493984B1 (en) | 1997-06-04 |
US5274799A (en) | 1993-12-28 |
DE69126416D1 (de) | 1997-07-10 |
CA2058734A1 (en) | 1992-07-05 |
US5617530A (en) | 1997-04-01 |
EP0493984A2 (en) | 1992-07-08 |
EP0493984A3 (en) | 1993-05-12 |
US5526482A (en) | 1996-06-11 |
CA2058734C (en) | 2002-06-25 |
WO1992012482A1 (en) | 1992-07-23 |
US5911779A (en) | 1999-06-15 |
JP3129732B2 (ja) | 2001-01-31 |
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