About MSDP optimized duplication within the same domain
Optimized duplication within the same domain copies the deduplicated backup images between within the same domain. The source and the destination storage must use the same NetBackup master server.
The optimized duplication operation is more efficient than normal duplication. Only the unique, deduplicated data segments are transferred. Optimized duplication reduces the amount of data that is transmitted over your network.
Optimized duplication is a good method to copy your backup images off-site for disaster recovery.
By default, NetBackup does not retry the failed optimized duplication jobs that NetBackup Vault invokes using the bpduplicate command. You can change that behavior.
See Configuring NetBackup optimized duplication or replication behavior.
You can use a separate network for the duplication traffic.
Review the following requirements and limitations.
The following are the requirements for optimized duplication within the same NetBackup domain:
The source storage and the destination storage must have at least one media server in common.
See About the media servers for MSDP optimized duplication within the same domain.
In the storage unit you use for the destination for the optimized duplication, you must select only the common media server or media servers.
If you select more than one, NetBackup assigns the duplication job to the least busy media server. If you select a media server or servers that are not in common, the optimized duplication job fails.
For more information about media server load balancing, see the NetBackup Administrator's Guide, Volume I:
The destination storage unit cannot be the same as the source storage unit.
The following are limitations for optimized duplication within the same NetBackup domain:
If an optimized duplication job fails after the configured number of retries, NetBackup does not run the job again.
By default, NetBackup retries an optimized duplication job three times. You can change the number of retries.
See Configuring NetBackup optimized duplication or replication behavior.
NetBackup does not support MSDP optimized duplication to storage unit groups. If you use a storage unit group as a destination for optimized duplication, NetBackup uses regular duplication.
Optimized duplication does not support multiple copies. If NetBackup is configured to make multiple new copies from the (source) copy of the backup image, the following occurs:
In a storage lifecycle policy, one duplication job creates one optimized duplication copy. If multiple optimized duplication destinations exist, a separate job exists for each destination. This behavior assumes that the device for the optimized duplication destination is compatible with the device on which the source image resides.
If multiple remaining copies are configured to go to devices that are not optimized duplication capable, NetBackup uses normal duplication. One duplication job creates those multiple copies.
For other duplication methods, NetBackup uses normal duplication. One duplication job creates all of the copies simultaneously. The other duplication methods include the following: NetBackup Vault, the bpduplicate command line, and the duplication option of the Catalog utility in the NetBackup Administration Console.
The copy operation uses the maximum fragment size of the source storage unit, not the setting for the destination storage unit. The optimized duplication copies the image fragments as is. For greater efficiency, the duplication does not resize and reshuffle the images into a different set of fragments on the destination storage unit.