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itself. (In firmware version 3.3.0 or higher, differential backups will deduplicate against each other
so the amount of data replicated is reduced to the size of incremental backups.) Database block-level
incrementals will also always be replicated as the entire size of the incremental backup because
the data is always unique.
Multi-node Replication Scaling
The HP VLS9000 and VLS12000 architectures allow formidable scaling in terms of capacity and
performance. Supporting multiple nodes, the backup throughput, deduplication comparison, and
the replication process can be load balanced across all the available nodes to ensure no bottlenecks
to performance. Because the VLS hardware should never be the bottleneck for replication, the
LAN/WAN link will be the bottleneck. For example, a 4-node configuration backing up 60 TB
per day could require a 1000 Mbit link for the daily replication traffic; this bandwidth is easily
achieved by balancing the replication workload across the four nodes.
Figure 46 Replication Scaling
The main reason to have replication LAN links on each node is to distribute the replication processing
evenly across the nodes (not to increase the bandwidth). Always use all of the nodes for replication
or you risk overloading the master node.
VLS Replication Implementation
You must perform the following to implement replication on VLS systems.
Licensing
On HP VLS devices, the replication is licensed as follows:
Requires Accelerated deduplication to be fully licensed and enabled on both the source and
target devices.
Requires VLS replication licenses on the replication target device, with one license for each
node configured in the target device. In active-passive deployment, you would install one
license per node in the passive target device. In many-to-one deployment, you would install
one license per node on the one target device (this then supports up to ten source devices,
and additional licenses are required for more than 10 sources). In the active-active deployment,
100 Replication
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