Home > Storage > PowerFlex > White Papers > Dell APEX Block Storage for AWS: Backup and Recovery using DDVE and DD Boost Oracle RMAN Agent > DD deduplication notes
DD compresses data at two levels: global and local, global compression, or deduplication, identifies redundant data segments and stores only the unique data segments by comparing received data to data already stored on disk, while local compression compresses the unique data segments.
The total compression factor indicates the total amount of compression the DD system performed with the data that it received. The higher the total compression factor for a backup, the greater the space savings for that backup.
The data reduction percentage represents the total compression savings to show the consolidation achieved during the backups. The higher the reduction percentage, the greater the space savings on the DD appliance.
DD Boost software sends only unique data from the backup host or client to the DD system, enabling more efficient use of the network. Also, the greater the amount of unique data, the higher the CPU utilization.
Note: High network bandwidth is a significant concern because most applications and databases are backed up during the same off-business hours. Minimizing network bandwidth makes it possible to protect more databases that share the same network efficiently. The larger the data center and the greater number of applications, the more important it is to have lower network bandwidth during backup periods.