Garg Law Firm, PLLC
File system implementing write once read many (WORM)
The embodiments deal with files that are already present in a storage when mounting the storage in a file system and files created after the mounting as different groups. (Metadata of) the files is classified. The files are each divided into metadata (index) and a file main body and are recorded on different storage areas, that is, an index partition (IP) and a data partition (DP), associated with each other. This file system is effective in a storage format in which a new file is merely written and an already written file is not updated or deleted (for example, a tape medium used in the LTFS). The embodiments implement a WORM file system by rejecting a request to update or delete a file that is present at mounting as a WORM file and permitting update or deletion of a file that is created after mounting until the storage is unmounted.
INTERNATIONAL BUSINESS MACHINES CORPORATION
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G06F G06F G06F
inventional inventional inventional
Masahide Terue Takeshi Yutaka Takashi Setsuko Atsushi
Washizawa Watanabe Ishimoto Oishi Ashida Masuda Abe