Tertiary storage unit management in bidirectional data copying
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United States of America Patent
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Dec 4, 2018
Grant Date -
Feb 23, 2017
app pub date -
Nov 2, 2016
filing date -
Apr 3, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
In one embodiment of the present description, mirroring is provided for a pair of storage units in bidirectional synchronous mirror relationships, and a tertiary storage unit. The mirroring includes multi-target mirroring to write updates written to the first storage unit to both the second storage unit and to a third storage unit. Similarly, for updates written to the second storage unit, multi-target mirroring is employed to write those to both the first storage unit and to the third storage unit. Other aspects are described.
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