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The HSM client automatically migrates files to TSM storage when space is needed on your local file system, and automatically recalls files when you access them. Stub files, containing necessary information to locate and recall your migrated files, replace the original files on your local file system.
At any time, you can migrate and recall specific files. For example, if you run threshold migration and some files do not migrate to storage because their last access dates make them ineligible for migration, use selective migration. Files migrate immediately to TSM storage. Use selective recall to return them to your local file system.
A file is eligible for automatic or selective migration when it meets the following criteria:
You can migrate any file in a set of hardlinked files that you did not exclude from space management and that you assigned a management class permitting automatic or selective migration.
For AIX GPFS file systems only: Newly-created files that you migrate either automatically or selectively must be older than five minutes before you can migrate them. Migrating newly-created files of less then five minutes might display incorrect results (resident size) when you use the dsmdf and dsmdu commands because the GPFS is not synchronized on all nodes when you migrate files. The dsmdf command will display correct results after GPFS synchronization, and after the next reconcilation of the file system.
This chapter describes automatic migration, premigration, and selective migration.