Data transfer techniques with data replication
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United States of America Patent
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Jan 30, 2018
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N/A
app pub date -
Mar 30, 2015
filing date -
Mar 30, 2015
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Abstract
Described are data replication techniques. Writes of cycle N directed to a first storage device of a first data storage system are received. Writes of cycle N−1 directed to the first storage device are transmitted to a second data storage system. Writes of cycle N−2 directed to the first storage device are applied to a second storage device of the second data storage system. An acknowledgement regarding cycle N−1 is sent to the first data storage system responsive to determining that the writes of cycle N−1 directed to the first storage device have been received by the second data storage system and that the writes of cycle N−2 have been applied to the second storage device. At least some writes of cycle N directed to the first storage device are transmitted to the second data storage system prior to the first data storage system receiving the acknowledgement regarding cycle N−1.
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