Multiprotection for snapsnots
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United States of America Patent
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-
Apr 3, 2012
Grant Date -
N/A
app pub date -
Oct 29, 2008
filing date -
Oct 29, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
Providing a multiple protection snapshot copy of a logical device includes creating the snapshot copy of the logical device, where, in response to a write to a section of the logical device, data is copied to a first alternative storage area prior to the write and, following creating the snapshot copy, pointing portions of the snapshot copy to a second alternative storage area having data that is a copy of the logical device, where data corresponding to the snapshot copy is stored in one of: the first alternative storage area and the second alternative storage area. Providing a multiple protection snapshot copy of a logical device may also include, prior to pointing portions of the snapshot copy to the second alternative storage area and after creating the snapshot copy, copying data from the logical device to the second alternative storage area.
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