Data replication method over a limited bandwidth network by mirroring parities
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United States of America Patent
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Issued Date -
Feb 16, 2006
app pub date -
Oct 22, 2004
filing date -
Aug 13, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A storage architecture provides efficient remote mirroring of data in RAID storage or like to a remote storage through a network connection. The storage architecture mirrors only a delta_parity. A parity cache keeps the delta_parity of each data block until the block is mirrored to the remote site. Whenever network bandwidth is available, the parity cache performs a cache operation to mirror the delta_parity to the remote site. If a cache miss occurs, i.e. the delta_parity is not found in the parity cache, computation of the data parity creates the delta_parity. For RAID architectures, reading old data and old parity is a necessary step of computing new parity for every write operation. Thus, no additional operation is needed to compute the delta_parity for mirroring. At the remote site, the delta_parity is used to generate the new parity and the new data using the old data and parity and, in turn, WAN traffic is substantially reduced.
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