Patent ID: 9690837
Date: 2017-06-27
CPC Classifications: G06F

Claim:
1. A method of preserving redundant copies of metadata in a data storage system employing de-duplication, the method comprising: creating metadata describing a file of a file system stored on the data storage system; buffering the metadata within a metadata buffer of system memory of the data storage system; sending contents of the metadata buffer from system memory to transmission circuitry of the data storage system; directing the transmission circuitry to store the contents of the metadata buffer to a first location of persistent storage of the data storage system; and directing the transmission circuitry to store a modified version of the contents of the metadata buffer to a second location of persistent storage of the data storage system, the first location being different from the second location; wherein: the contents of the metadata buffer include a block of file system metadata, the block of file system metadata including an integer number of sectors of file system metadata arranged in a sector order from a first sector to a last sector; sending the contents of the metadata buffer from system memory to the transmission circuitry includes: