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Tivoli Space Manager for UNIX Using the Hierarchical Storage Management Clients

Premigrate Your Files

For faster migration, the HSM client prepares files for automatic migration using a process called premigration. Files are copied to storage beyond the low threshold that you set while the original files remain intact on your local file system. When free space is again needed on your local file system, premigrated files become migrated files. The HSM client verifies that files did not change since they became premigrated. When your premigrated files migrate to storage, stub files replace them on your local file system.

The HSM client premigrates files each time it completes automatic migration if:

The premigration percentage represents the amount of free space on your file system containing premigrated files that are the next eligible candidates for migration. The default for the premigration percentage is the difference between the percentage that you set for the high threshold and the percentage that you set for the low threshold for your file system. You can change the premigration percentage at any time.


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