Computer system, file storage controller, and data sharing method

A file storage controller coupled to a file storage device and an archive storage apparatus, the file storage controller configured to:

• store a copy of a shared file system in the file storage device;
• operate on the copy of the shared file system;
• after operating on the copy of the shared file system, transmit target data that was a target of the operation in association with operation information indicating a type of the operation to the archive storage apparatus;
• execute a synchronization process of
• acquiring a consistency checklist, including, for each of one or more operations performed by a plurality of file storage apparatuses, consistency information comprising the operation information and a version indicator indicating an order of reception of the operation information by the archive storage apparatus, from the archive storage apparatus,
• correcting inconsistency between different consistency information in the acquired consistency checklist based on the version indicators in the different consistency information, and
• updating the copy of the shared file system to reflect the corrected consistency checklist;
• acquire a version list, stored at the archive storage apparatus for managing the version indicators included in the consistency information in order of version indicators, from the archive storage apparatus;
• and
• transmit, to the archive storage apparatus, a request of setting flags on the consistency information in a range exceeding a threshold when a number of versions included in the version list exceeds the threshold, to cause the archive storage apparatus to set the flags on the consistency information in a first area according to the setting request, and move the consistency information provided with the flags to a second area different from the first area.

A data sharing method by a plurality of file storage apparatuses coupled to an archive storage apparatus, each of the plurality of file storage apparatuses configured to store that file storage apparatus's own copy of a file system, the data sharing method comprising:

• by a first file storage apparatus of the plurality of file storage apparatuses,
• operating on the first file storage apparatus's copy of the file system,
• after operating on the first file storage apparatus's copy of the file system, transmitting target data that was a target of the operation in association with operation information indicating a type of the operation to the archive storage apparatus, and
• executing a synchronization process of
• acquiring a consistency checklist, including, for each of one or more operations performed by the plurality of file storage apparatus, consistency information comprising the operation information and a version indicator indicating an order of reception of the operation information by the archive storage apparatus, from the archive storage apparatus,
• correcting inconsistency between different consistency information in the acquired consistency checklist based on the version indicators in the different consistency information, and
• updating the first file storage apparatus's copy of the file system to reflect the corrected consistency checklist;
• by the archive storage apparatus,
• storing the consistency information in a first area, and
• storing a version list for managing the version indicators included in the consistency information in order of version indicators;
• by the first file storage apparatus,
• acquiring the version list from the archive storage apparatus, and
• transmitting, to the archive storage apparatus, a request of setting flags on the consistency information in a range exceeding a threshold when a number of versions included in the version list exceeds the threshold;
• and,
• by the archive storage apparatus,
• setting the flags on the consistency information in the first area according to the setting request, and
• moving the consistency information provided with the flags to a second area different from the first area.