Coordinated space reclamation in space-efficient flashcopy volumes
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United States of America Patent
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May 16, 2017
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app pub date -
May 3, 2015
filing date -
May 3, 2015
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Abstract
A method for releasing storage space in a space-efficient volume is disclosed. In one embodiment, such a method includes maintaining, for a space-efficient volume, a bitmap comprising a bit for each track in the space-efficient volume. A host system indicates whether a track is one of used and unused by marking the corresponding bit in the bitmap. A storage controller reads the bitmap and frees tracks from the space-efficient volume that the bitmap indicates are unused. In certain embodiments, the bitmap is stored on the space-efficient volume. For example, the bitmap may be appended to a volume table of contents (VTOC) stored on the space-efficient volume. A corresponding system and computer program product are also disclosed.
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