About MSDP optimized synthetic backups
Optimized synthetic backups are a more efficient form of synthetic backup. A media server uses messages to instruct the storage server which full and incremental backup images to use to create the synthetic backup. The storage server constructs (or synthesizes) the backup image directly on the disk storage. Optimized synthetic backups require no data movement across the network.
The optimized synthetic backup method provides the following benefits:
Faster than a synthetic backup.
Regular synthetic backups are constructed on the media server. They are moved across the network from the storage server to the media server and synthesized into one image. The synthetic image is then moved back to the storage server.
Requires no data movement across the network.
Regular synthetic backups use network traffic.
In NetBackup, the Optimizedlmage attribute enables optimized synthetic backups. It applies to both storage servers and deduplication pools. Beginning with NetBackup 7.1, the Optimizedlmage attribute is enabled by default on storage servers and media server deduplication pools. For the storage servers and the disk pools that you created in NetBackup releases earlier than 7.1, you must set the Optimizedlmage attribute on them so they support optimized synthetic backups.
Table: MSDP requirements and limitations for optimized synthetic backups
| What | Description |
|---|---|
|
Requirements |
The target storage unit's deduplication pool must be the same deduplication pool on which the source images reside. |
|
Limitations |
NetBackup does not support storage unit groups as a destination for optimized synthetic backups. If NetBackup cannot produce the optimized synthetic backup, NetBackup creates the more data-movement intensive synthetic backup. |