DATA BACKUP METHOD OF DISTRIBUTED FILE SYSTEM
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United States of America Patent
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Issued Date -
Jul 16, 2015
app pub date -
Jan 9, 2015
filing date -
Jan 11, 2014
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Abstract
A data backup method of a distributed file system is provided. The method is based on a comparison of a source file system and a target file system. Metadata of the target file system is compared with metadata of the source file system. The method includes: synchronizing target metadata of a target file according to source metadata of a source file, generating a file checksum list; determining whether a first target block is consistent with a first source block, obtaining and sending a first updated file checksum list to a first data node; determining whether a first chunk is consistent with a first target chunk, generating a first difference list, sending the first difference list and the first updated file checksum list to a first corresponding target data node; creating a temporary block, writing data in the temporary block, replacing the first corresponding target block with the temporary block.
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