How data lifecycle management (DLM) works in a CAS environment
Backup Exec uses data lifecycle management (DLM) to delete the expired backup sets on disk storage, disk cartridge media, deduplication storage, storage arrays, and virtual disks. By default, Backup Exec keeps the most recent backup sets that are necessary to restore any backed-up component of a server, even if the backup sets expire. If backup sets are dependent of other backup sets, then Backup Exec does not delete the backup set until all expiration dates on the backup sets are reached. Even if the backup set is displayed as expired, the data is available until all dependent backup sets expire as well.
If you want Backup Exec to delete all expired backup sets, even if they are the last remaining backup sets that you need to restore a server, you can select the option Allow Backup Exec to delete all expired backup sets on the Storage settings dialog box. In a CAS environment, this option appears only on the central administration server. If you enable this option on the central administration server, DLM deletes all expired backup sets on the central administration server as well as on the managed Backup Exec servers. This option deletes all expired backup sets on both centrally managed and locally managed Backup Exec servers.
Warning: If you enable the optionAllow Backup Exec to delete all expired backup sets, the data that you need to restore a server may not be available.
If you manually expire a backup set from the central administration server, DLM immediately runs on the server on which the backup set was created. The server can be either the central administration server or the managed Backup Exec server. DLM runs only on the storage device from which the backup set was manually expired. If you manually expire a backup set from a managed Backup Exec server, DLM runs immediately on the storage device from which the backup set was manually expired.
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