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
- 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 CloudCatalyst
- Using NetBackup CloudCatalyst to upload deduplicated data to the cloud
- Configuring a CloudCatalyst 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
- About unified logging
- About legacy logging
- Troubleshooting MSDP installation issues
- Troubleshooting MSDP configuration issues
- Troubleshooting MSDP operational issues
- Troubleshooting CloudCatalyst issues
- CloudCatalyst logs
- Problems encountered while using the Cloud Storage Server Configuration Wizard
- Disk pool problems
- Problems during cloud storage server configuration
- CloudCatalyst troubleshooting tools
- Appendix A. Migrating to MSDP storage
Modes of rolling data conversion
MSDP uses the rolling data conversion mechanism to convert Blowfish encrypted data to AES-256 encrypted data, and MD5-like fingerprints to SHA-512/256 fingerprints, in parallel. There are two modes of data conversion: normal mode and fast mode.
Normal mode: By default, the data conversion process starts in a normal mode for an upgraded system. Similar to compaction, the data conversion runs only when no backup, restore, or Content Router Queue Processing (CRQP) jobs are active.
In the normal mode, the time for data conversion depends on the following factors:
Total size of the storage
Power of the CPU
Workload on the system
Data conversion in the normal mode may take a longer time.
Veritas tests in a controlled environment showed that for a single 1-TB mount point, the conversion speed is about 50MB/s in normal mode.
Fast mode: In the fast mode, the data conversion disables cyclic redundancy checks and compaction. The rolling data conversion runs while backup, restore, duplication, or CRQP jobs are active.
Veritas tests in a controlled environment showed that for a single 1-TB mount point, the conversion speed is about 105MB/s in fast mode.
The performance numbers shown were observed in the Veritas test environment and are not a guarantee of performance in your environment.
In a new installation of NetBackup 8.1, the rolling data conversion is marked as Finished and does not start in the future. For an upgrade to NetBackup 8.1, the rolling data conversion is enabled by default and works in the background after the MSDP conversion completes. Only the data that existed before upgrade is converted. All new data uses the new SHA-512/256 fingerprint and does not need conversion.
While in Fast mode, the rolling data conversion affects the performance of backup, restore, duplication, and replication jobs. To minimize this effect, use the Normal mode, which pauses the conversion when the system is busy, but slows down the conversion process. The Fast mode keeps the conversion active regardless of system state.
You can manage and monitor the rolling data conversion using the following crcontrol command options.
Table: MSDP crcontrol command options for rolling data conversion
To start the data conversion process, use the --dataconverton option:
UNIX: /usr/openv/pdde/pdcr/bin/crcontrol --dataconverton
To stop the data conversion process, use the --dataconverton option:
UNIX: /usr/openv/pdde/pdcr/bin/crcontrol --dataconvertoff
To determine the mode of data conversion and the conversion progress, use the --dataconvertstate option:
UNIX: /usr/openv/pdde/pdcr/bin/crcontrol --dataconvertstate
To switch between the normal mode and fast mode of data conversion, use the --dataconvertmode option:
UNIX: /usr/openv/pdde/pdcr/bin/crcontrol --dataconvertmode <mode>
The default value for the <mode> variable is 0, which stands for the normal mode. To switch data conversion from normal mode to fast mode, enter 1 for the value of the <mode>variable.