Veritas NetBackup™ Deduplication Guide
- Introducing the NetBackup media server deduplication option
- Planning your deployment
- About MSDP storage and connectivity requirements
- About NetBackup media server deduplication
- About NetBackup Client Direct deduplication
- About MSDP remote office client deduplication
- About MSDP performance
- MSDP deployment best practices
- Provisioning the storage
- Licensing deduplication
- Configuring deduplication
- Configuring the Deduplication Multi-Threaded Agent behavior
- Configuring the MSDP fingerprint cache behavior
- Configuring MSDP fingerprint cache seeding on the storage server
- About MSDP Encryption using KMS service
- Configuring a storage server for a Media Server Deduplication Pool
- Configuring a disk pool for deduplication
- Configuring a Media Server Deduplication Pool storage unit
- About MSDP optimized duplication within the same domain
- Configuring MSDP optimized duplication within the same NetBackup domain
- Configuring MSDP replication to a different NetBackup domain
- About NetBackup Auto Image Replication
- Configuring a target for MSDP replication to a remote domain
- Creating a storage lifecycle policy
- Resilient Network properties
- Editing the MSDP pd.conf file
- About protecting the MSDP catalog
- Configuring an MSDP catalog backup
- Configuring deduplication to the cloud with NetBackup Cloud Catalyst
- Using NetBackup Cloud Catalyst to upload deduplicated data to the cloud
- Configuring a Cloud Catalyst storage server for deduplication to the cloud
- Monitoring deduplication activity
- Viewing MSDP job details
- Managing deduplication
- Managing MSDP servers
- Managing NetBackup Deduplication Engine credentials
- Managing Media Server Deduplication Pools
- Changing a Media Server Deduplication Pool properties
- Configuring MSDP data integrity checking behavior
- About MSDP storage rebasing
- Managing MSDP servers
- Recovering MSDP
- Replacing MSDP hosts
- Uninstalling MSDP
- Deduplication architecture
- Troubleshooting
- About unified logging
- About legacy logging
- Troubleshooting MSDP installation issues
- Troubleshooting MSDP configuration issues
- Troubleshooting MSDP operational issues
- Troubleshooting Cloud Catalyst issues
- Cloud Catalyst logs
- Problems encountered while using the Cloud Storage Server Configuration Wizard
- Disk pool problems
- Problems during cloud storage server configuration
- Cloud Catalyst troubleshooting tools
- Appendix A. Migrating to MSDP storage
About MSDP storage rebasing
During an initial backup, NetBackup writes the data segments from a backup to as few container files as possible. Read performance is best when the data segments from a client backup are close to each other on deduplication storage. NetBackup consumes less time finding and reassembling backed up files when their segments are near each other.
However, the data segments in a backup may become scattered across the disk storage each time the client is backed up. Such scattering is a normal consequence of deduplication.
NetBackup includes a process, called rebasing, that helps to maintain the data segments in as few container files as possible. Rebasing improves performance for the operations that read from the storage, such as restores and duplications. NetBackup writes all of the data segments from a backup into new container files even though the segments exist on storage already. Future backups then refer to the new copies of those segments rather than the old copies until any changes because of future rebasing. Deduplication rates for the backup jobs that perform rebasing are lower than for the jobs that do not rebase the data.
After the rebasing, NetBackup reclaims the storage space that the rebased data segments used.
Table: Types of rebasing describes the rebasing operations.
Table: Types of rebasing
Type | Description |
---|---|
Normal backup rebasing |
The rebasing that occurs during a backup if the normal rebasing criteria are met, as follows:
Backup rebasing occurs only for the full backups that pass through the normal MSDP backup process. For example, the NetBackup Accelerator backups do not pass through the MSDP backup process. NetBackup reports backup job completion after the rebasing is completed. |
Periodic backup rebasing |
The rebasing that occurs during a backup if the periodic rebasing criteria are met, as follows:
Backup rebasing occurs only for the full backups that pass through the normal MSDP backup process. For example, the NetBackup Accelerator backups do not pass through the MSDP backup process. NetBackup reports backup job completion after the rebasing is completed. |
Server-side rebasing |
The storage rebasing that occurs on the server if the rebasing criteria are met. Server-side rebasing includes the deduplicated data that does not pass through the normal MSDP backup process. For example, the NetBackup Accelerator backups do not pass through the MSDP backup process. Some parameters in the |