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Storage of sparse files using parallel log-structured file system

United States Patent

November 7, 2017
View the Complete Patent at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
A sparse file is stored without holes by storing a data portion of the sparse file using a parallel log-structured file system; and generating an index entry for the data portion, the index entry comprising a logical offset, physical offset and length of the data portion. The holes can be restored to the sparse file upon a reading of the sparse file. The data portion can be stored at a logical end of the sparse file. Additional storage efficiency can optionally be achieved by (i) detecting a write pattern for a plurality of the data portions and generating a single patterned index entry for the plurality of the patterned data portions; and/or (ii) storing the patterned index entries for a plurality of the sparse files in a single directory, wherein each entry in the single directory comprises an identifier of a corresponding sparse file.
Bent; John M. (Los Alamos, NM), Faibish; Sorin (Newton, MA), Grider; Gary (Los Alamos, NM), Torres; Aaron (Los Alamos, NM)
EMC IP Holding Company LLC (Hopkinton, MA), Los Alamos National Security, LLC (Los Alamos, NM)
13/ 921,719
June 19, 2013
STATEMENT OF GOVERNMENT RIGHTS This invention was made under a Cooperative Research and Development Agreement between EMC Corporation and Los Alamos National Security, LLC. The United States government has rights in this invention pursuant to Contract No. DE-AC52-06NA25396 between the United States Department of Energy and Los Alamos National Security, LLC for the operation of Los Alamos National Laboratory.