Using NetBackup with Storage Migrator

If you require a storage migration product, VERITAS recommends that you use Storage Migrator for UNIX (VSM). NetBackup can back up files from a disk type storage unit that has file systems managed by VSM.

When a file is migrated, its data is copied to secondary storage. The data can then be deleted (or purged) from the disk storage unit because it is copied elsewhere. The files can then be recalled (or cached) from secondary storage should they be needed locally.

NetBackup proceeds as follows when backing up a file that has been purged by Storage Migrator:

• For user backups by nonroot users, NetBackup first caches the files and then backs them up.
• For scheduled backups and user backups by a root user, NetBackup backs up only the migration information for the files. Because the data is already resident on secondary storage, NetBackup neither backs up the data nor caches it.

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 Caution    Because NetBackup does not set the Storage Migrator obsoletion date for a file, you must ensure that your migrated copies are retained at least as long as your backups. Restores will not be possible unless you ensure the copies are retained.

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When NetBackup restores files that have been purged, Storage Migrator considers the restored files to be purged, with a file slice value of zero. If files have been selected for migration and not yet copied to secondary storage, NetBackup backs them up.

A bparchive back up and remove operation always caches a purge file.