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When an Avamar data store is the backup target, the Avamar client installed on each host works as a
typical Avamar client that is performing client-side deduplication. It processes and sends capacity-
optimized blocks, and any required metadata, over the WAN/LAN to the Avamar server. This dataflow
is not a change from the well-known implementation in previous versions of Avamar.
When specifying a Data Domain system as the backup target of a particular dataset from within
Avamar Administrator, the same Avamar client leverages Data Domain Boost (DD Boost) software
to redirect this data directly to a Data Domain system. DD Boost extends the optimization capabilities
of Data Domain solutions. It significantly increases performance by distributing parts of the
deduplication process to the backup server, and simplifies disaster recovery procedures.
Rather than performing intensive deduplication processing only on the client, DD Boost transfers the
source data in an efficient transfer method for processing by the Data Domain system.
Besides transferring backup payload data optimally to the Data Domain system, the Avamar client
simultaneously sends the relevant metadata it has generated to the Avamar server for storage. This
metadata allows the Avamar management system to direct the client in performing restore operations
directly from the Data Domain system without going through the Avamar server. This functionality,
implemented within the Avamar client software, is the same DD Boost API and technology that are
supported on many other Data Domain implementations today.
Recovery
The process of data recovery, whether from an Avamar data store or from a Data Domain system, is
completely transparent to the backup administrator. The backup administrator uses the same
recovery processes that are native to previous Avamar versions. The Avamar front end automatically
retrieves datasets that are stored on Data Domain systems. No special retrieval mechanisms or
processes are required.
Replication
As shown in Figure 2 in the architecture section, replication between primary and replica Data Domain
systems is also integrated into the Avamar management feature set. This is controlled by the
replication policy applied to each dataset in Avamar Administrator. All typical Avamar replication
scenarios are supported for datasets targeted to Data Domain. These include:
Many-to-one, one-to-many, cascading replication
Extension of data retention times
Root-to-root replication
Like the recovery process, the replication process normally configured within the Data Domain
platform is automated within the Avamar framework and is transparent to the backup administrator.
This replication functionality requires that a remote Avamar server exists, along with the remote Data
Domain system.
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