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Tivoli Space Manager for UNIX Using the Hierarchical Storage Management Clients


Backing Up, Migrating, and Restoring Your Files

You can back up and migrate your files to the same TSM server or to different TSM servers. If you back up and migrate files to the same server, the HSM client can verify that current backup versions of your files exist before you migrate them.

To restore stub files rather than backup versions of your files, use the restoremigstate option with the TSM backup-archive client restore command. This is useful if one or more of your local file systems is damaged or lost. Your migrated files remain intact, and you need only restore your stub files. To recreate stub files for any migrated or premigrated files that are not backed up, use the dsmmigundelete command.

Note:
If you back up and migrate data to tape, use separate tape drives for backed up and migrated data. Otherwise, you cannot back up TSM-migrated files. A transparent recall can wait a while for the tape drive to become available. To improve performance, migrate your data to disk storage rather than to tape. Performance requirements for migrated data might be stricter than those for backup data.

If you back up files to one server and migrate them to a different server, the HSM client cannot verify that current backup versions of your files exist before you migrate them. Use the backup-archive client to restore the actual backup versions only. You cannot use the backup-archive client to restore stub files for your migrated files. Use the dsmmigundelete command to recreate stub files for any migrated or premigrated files that are lost.


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