About the MSDP data removal process
The data removal process removes the data segments that comprise a NetBackup backup image. Only those segments that are not referred to by a backup image are removed.
The following list describes the data removal process for expired backup images:
NetBackup removes the image record from the NetBackup catalog.
NetBackup directs the NetBackup Deduplication Manager to remove the image.
The deduplication manager immediately removes the image entry in the deduplication catalog and adds a removal request to the NetBackup Deduplication Engine's transaction queue.
From this point on, the expired backup image is no longer accessible.
When the NetBackup Deduplication Engine processes the queue, all of the removal requests are processed. A removal request for the image is not generated again.
During the queue processing, the Deduplication Engine reclaims some of the storage space on which the data segments reside. Some is reclaimed during data compaction. If a different backup image requires a data segment, the segment is not removed.
Various internal parameters control whether a container file is compacted.
If you manually delete an image that has expired within the previous 24 hours, the data becomes garbage. It remains on disk until removed by the next garbage collection process. Garbage collection occurs during data integrity checking.