Systems and methods for data migration in a clustered file system

A system for coordinating access to data in a shared storage environment, the system comprising:

• a first computer comprising a first memory storing copies of first inodes in a shared file system that represent first data files that have not been migrated from primary storage to secondary storage;
• a second computer comprising a second memory storing copies of second inodes in the shared file system that represent second data files that have not been migrated from primary storage to secondary storage, the first and second memories not storing copies of inodes that represent stub files;
• first and second file system drivers executing on, respectively, said first and second computers, each of the first and second file system drivers being configured to request a shared lock on a signal file on the shared file system;
• and
• when the request for the shared lock on the signal file is denied of at least one of the first and second file system drivers, clearing the respective copies of the first and/or second inodes from the respective first and/or second memories, and
• when the request for the shared lock on the signal file is granted to at least one of the first and second file system drivers, unlocking the signal file and re-requesting the shared lock on the signal file after a predetermined period of time.

A system for coordinating access to data in a shared storage environment, the system comprising:

• first means for storing on a first computing device a first indication of first inodes in a shared file system that represent first data files that have not been migrated from primary storage to secondary storage;
• second means for storing on a second computing device a second indication of second inodes in the shared file system that represent second data files that have not been migrated from primary storage to secondary storage, the first and second means for storing not storing indications of inodes that represent stub files;
• third means for requesting a non-exclusive lock on a signal file on the shared file system to determine whether or not a migration operation is about to occur on data in the shared file system;
• and
• fourth means for requesting a non-exclusive lock on the signal file on the shared file system to determine whether or not a migration operation is about to occur at least on at least one of the first and second data files,
• and when the request for the non-exclusive lock on the signal file is denied of at least one of the third and fourth means for requesting, clearing the first and/or second indications of the, respective, first and/or second means for storing,
• and when the request for the non-exclusive lock on the signal file is granted to at least one of the third and fourth means for requesting, unlocking the signal file and re-requesting with the at least one of the third and fourth means for requesting the non-exclusive lock on the signal file after a predetermined period of time.