BACKUP CONTROL DEVICE, BACKUP SYSTEM, BACKUP CONTROL METHOD, AND BACKUP CONTROL PROGRAM

BACKUP CONTROL DEVICE, BACKUP SYSTEM, BACKUP CONTROL METHOD, AND BACKUP CONTROL PROGRAM

To prevent excessive backup of data and prevent performance degradation in backup processing.SOLUTION: A control device 4 of a virtual tape system 2 has an unmount unit 62 and a cache-off unit 64. When unmounting a logical volume, the unmount unit 62 writes logical volume data to only one physical v...

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Bibliographische Detailangaben
Hauptverfasser: YAMATO TAKAAKI, ENOHARA KATSUO, HIRABAYASHI NAOKI, KINOSHITA TETSUYA, HIRASHIMA NOBUYUKI, USUDA YOSUKE, KURIHARA TAKUYA
Format: Patent
Sprache:eng ; jpn
Schlagworte:
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Beschreibung
Zusammenfassung:To prevent excessive backup of data and prevent performance degradation in backup processing.SOLUTION: A control device 4 of a virtual tape system 2 has an unmount unit 62 and a cache-off unit 64. When unmounting a logical volume, the unmount unit 62 writes logical volume data to only one physical volume. Then, the cache-off unit 64 writes the logical volume data to another physical volume when off-caching the unmounted logical volume.SELECTED DRAWING: Figure 1 【課題】データの過剰バックアップを防ぎ、バックアップ処理の性能低下を防ぐこと。【解決手段】仮想テープシステム２の制御装置４は、アンマウント部６２と、キャッシュオフ部６４とを有する。アンマウント部６２は、論理ボリュームをアンマウントする際に論理ボリュームのデータを１つの物理ボリュームだけに書き込む。そして、キャッシュオフ部６４は、アンマウントされた論理ボリュームをオフキャッシュする際に論理ボリュームのデータを他の物理ボリュームに書き込む。【選択図】図１