Replication - Dell PowerVault DL4000 User Manual

In replication scenarios, AppAssure 5 uses SSL 3.0 to secure the connections between the two cores in a replication
topology to prevent eavesdropping and tampering.

Replication

Replication is the process of copying recovery points and transmitting them to a secondary location for the purpose of
disaster recovery. The process requires a paired source-target relationship between two cores. Replication is managed
on a per-protected-machine basis; meaning, backup snapshots of a protected machine are replicated to the target
replica core. When replication is set up, the source core asynchronously and continuously transmits the incremental
snapshot data to the target core. You can configure this outbound replication to your company's own data center or
remote disaster recovery site (that is, a "self-managed" target core) or to a managed service provider (MSP) providing
off-site backup and disaster recovery services. When you replicate to an MSP, you can use built-in workflows that let
you request connections and receive automatic feedback notifications.
Figure 4. Replication
Replication is self-optimizing with a unique Read-Match-Write (RMW) algorithm that is tightly coupled with
deduplication. With RMW replication, the source and target replication service matches keys before transferring data
and then replicates only the compressed, encrypted, deduplicated data across the WAN, resulting in a 10x reduction in
bandwidth requirements.
Figure 5. Read-Match-Write Replication
Replication begins with seeding, the initial transfer of deduplicated base images and incremental snapshots of the
protected agents, which can add up to hundreds or thousands of gigabytes of data. Initial replication can be seeded to
the target core using external media. This is typically useful for large sets of data or sites with slow links. The data in the
seeding archive is compressed, encrypted and deduplicated. If the total size of the archive is larger than the space
available on the removable media, the archive can span across multiple devices based on the available space on the
media. During the seeding process, the incremental recovery points replicate to the target site. After the target core
consumes the seeding archive, the newly replicated incremental recovery points automatically synchronize.
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