Resilient data storage in the presence of replication faults and rolling disasters
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United States of America Patent
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Sep 6, 2011
Grant Date -
Nov 19, 2009
app pub date -
May 11, 2009
filing date -
May 19, 2008
priority date (Note) -
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Abstract
A method for data protection includes, in a first operational mode, sending data items for storage in a primary storage device and in a secondary storage device, while temporarily caching the data items in a disaster-proof storage unit and subsequently deleting the data items from the disaster-proof storage unit, wherein each data item is deleted from the disaster-proof storage unit upon successful storage of the data item in the secondary storage device.An indication of a fault related to storage of the data in the secondary storage device is received. Responsively to the indication, operation is switched to a second operational mode in which the data items are sent for storage at least in the primary storage device and are cached and retained in the disaster-proof storage unit irrespective of the successful storage of the data items in the secondary storage device.
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