JP2011253467A - 記憶装置及びその制御プログラム - Google Patents
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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
- G06F11/08—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
- G06F11/1096—Parity calculation or recalculation after configuration or reconfiguration of the system
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0604—Improving or facilitating administration, e.g. storage management
- G06F3/0607—Improving or facilitating administration, e.g. storage management by facilitating the process of upgrading existing storage systems, e.g. for improving compatibility between host and storage device
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0629—Configuration or reconfiguration of storage systems
- G06F3/0632—Configuration or reconfiguration of storage systems by initialisation or re-initialisation of storage systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0683—Plurality of storage devices
- G06F3/0689—Disk arrays, e.g. RAID, JBOD
-
- 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
- G06F2211/1004—Adaptive RAID, i.e. RAID system adapts to changing circumstances, e.g. RAID1 becomes RAID5 as disks fill up
-
- 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
- G06F2211/1061—Parity-single bit-RAID4, i.e. RAID 4 implementations
Abstract
【解決手段】本発明に係るRAID対応NAS100は、新たなHDD4がディスクアレイ170に追加された場合に、ディスクアレイ170を構成する既存の各HDD1〜3に記憶されているデータに対応する誤り訂正符号を新たなHDD4に記憶させる。また、RAID対応NAS100は、新たなHDD4の追加後に新たなデータをディスクアレイ170に記憶させる場合に、新たなデータと当該新たなデータに対応する誤り訂正符号とを既存の各HDD1〜3及び新たなHDD4に分散させて記憶させる。
【選択図】図2
Description
第1実施形態においては、(1.1)RAID対応NASの概略構成、(1.2)RAID対応NASの詳細構成、(1.3)RAID5からRAID6への移行動作、(1.4)作用・効果の順に説明する。
図1は、本実施形態に係るRAID対応NAS100を含む通信システムの全体概略構成図である。
次に、図2及び図3を用いて、RAID対応NAS100の詳細構成について説明する。
図2は、第1実施形態に係るRAID対応NAS100の概略ハードウェア構成図である。第1実施形態に係るRAID対応NAS100は、HDDが着脱可能に構成されており、最大で4つのHDDを装着可能である。
図3は、RAID対応NAS100の概略ソフトウェア構成図である。
RAID5からRAID6への移行について、(1.3.1)新たなHDD追加時の動作、(1.3.2)新たなHDD追加後のデータ書き込み動作の順に説明する。
図4は、新たなHDD追加時の動作を説明するための動作説明図である。
図5は、新たなHDD追加後のデータ書き込み動作を説明するための動作説明図である。
以上説明したように、第1実施形態によれば、RAID対応NAS100は、新たなHDD4がディスクアレイ170に追加された場合に、RAID5で運用されているディスクアレイ170の各HDD1〜3に記憶されているデータに対応する誤り訂正符号を、新たなHDD4に記憶させる。このように、新たなHDD4に記憶させる初期データを、既存の各HDD1〜3に記憶されているデータに対応する誤り訂正符号とすることで、既存の各HDD1〜3に記憶されているデータ及び誤り訂正符号を保持できる。
第2実施形態では、RAID1からRAID5への移行を説明する。
図6は、第2実施形態に係るRAID対応NAS100の概略ハードウェア構成図である。
RAID1からRAID5への移行動作について、(2.2.1)新たなHDD追加時の動作、(2.2.2)新たなHDD追加後のデータ書き込み動作の順に説明する。
図7は、新たなHDD追加時の動作を説明するための動作説明図である。
図8は、新たなHDD追加後のデータ書き込み動作を説明するための動作説明図である。
以上説明したように、第2実施形態によれば、RAID対応NAS100は、新たなHDD3がディスクアレイ170に追加された場合に、RAID1で運用されているディスクアレイ170を構成する既存の各HDD1,2に記憶されているデータに対応する誤り訂正符号を新たなHDD3に記憶させる。このように、新たなHDD3がディスクアレイ170に追加された場合に、新たなHDD3に記憶させる初期データを、既存の各HDD1,2に記憶されているデータに対応する誤り訂正符号とすることで、既存の各HDD1,2に記憶されているデータを保持することできる。
上記のように、本発明は各実施形態によって記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなる。
Claims (7)
- 記憶媒体を複数用いて構成される記憶部と、
前記記憶部を制御する制御部とを具備する記憶装置であって、
前記制御部は、
新たな記憶媒体が前記記憶部に追加された場合に、前記記憶部を構成する既存の各記憶媒体に記憶されているデータに対応する誤り訂正符号を前記新たな記憶媒体に記憶させ、
前記新たな記憶媒体の追加後に新たなデータを前記記憶部に記憶させる場合に、前記新たなデータと前記新たなデータに対応する誤り訂正符号とを前記既存の各記憶媒体及び前記新たな記憶媒体に分散させて記憶させることを特徴とする記憶装置。 - 前記制御部は、前記新たな記憶媒体の追加前において、データ及び誤り訂正符号を分散させた状態で前記既存の各記憶媒体に記憶させることを特徴とする請求項1に記載の記憶装置。
- 前記制御部は、前記新たな記憶媒体の追加後において、前記新たな記憶媒体が前記記憶部に追加される前よりも誤り訂正符号の種類を増加させつつ、データ及び誤り訂正符号を分散させた状態で前記既存の各記憶媒体及び前記新たな記憶媒体に記憶させることを特徴とする請求項2に記載の記憶装置。
- 前記制御部は、前記新たな記憶媒体の追加前において、同一のデータを前記既存の各記憶媒体に記憶させることを特徴とする請求項1に記載の記憶装置。
- 前記制御部は、前記新たな記憶媒体の追加後において、データ及び誤り訂正符号を分散させた状態で前記既存の各記憶媒体及び前記新たな記憶媒体に記憶させることを特徴とする請求項4に記載の記憶装置。
- 前記制御部は、前記新たな記憶媒体が前記記憶部に追加された場合であって、且つユーザからの所定の操作を受け付けた場合に、前記既存の各記憶媒体に記憶されているデータに対応する誤り訂正符号を前記新たな記憶媒体に記憶させることを特徴とする請求項1〜5の何れか一項に記載の記憶装置。
- 記憶媒体を複数用いて構成される記憶部を具備する記憶装置に、
新たな記憶媒体が前記記憶部に追加された場合に、前記記憶部を構成する既存の各記憶媒体に記憶されているデータに対応する誤り訂正符号を前記新たな記憶媒体に記憶させる手順と、
前記新たな記憶媒体の追加後に新たなデータを前記記憶部に記憶させる場合に、前記新たなデータと前記新たなデータに対応する誤り訂正符号とを前記既存の各記憶媒体及び前記新たな記憶媒体に分散させて記憶させる手順と
を実行させることを特徴とする制御プログラム。
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JP2010128327A JP5521794B2 (ja) | 2010-06-03 | 2010-06-03 | 記憶装置及びその制御プログラム |
CN2011101509689A CN102270103A (zh) | 2010-06-03 | 2011-06-02 | 存储装置及其控制方法 |
US13/151,760 US20110302369A1 (en) | 2010-06-03 | 2011-06-02 | Storage apparatus and control method therefor |
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