• Replication-Source Library: This is a library on a D2D Backup System that has been configured
for backups from a host server and has some or all of its slots configured to be replicated. This
library is visible to the host.
• Replication-Target Library: This is a library on a D2D Backup System that has been configured to
contain slots that are replicants of those in a source library. This library is not visible to the host,
unless you configure devices to make it visible. This facility should be used with care. See
“Backup applications and target libraries” on page 82.
A single HP D2D Backup System may host both Replication-Source and Replication-Target Libraries
and can, therefore, act simultaneously in both Source and Target Appliance roles. However, the host
server will only be able to access Replication-Source or Non-Replicating Libraries. All actions on
Replication-Target Libraries are controlled from the HP D2D Web Management Interface.
Remote Site Data Center
1. Host backing up
3. Target Appliance2. Source Appliance
4. Non-Replicating Library
6. Replication Target Library5. Replication Source Library
Figure 37 Replication elements
Fan In, Fan Out and job concurrency
When configuring replication on complex sites, for example many Remote Sites into a Data Center,
care must be taken when planning how appliances and libraries will be replicated. The key concepts
to understand are FAN OUT, FAN IN and Concurrency.
Fan OUT
When we talk about FAN OUT, we are considering the number of replication Target Appliances that
are supported from that Source Appliance (the HP D2D Backup System that contains the libraries that
you wish to replicate).
Each library on the Source Appliance may be mapped to only one library on the Target Appliance.
You cannot split slot mappings from one Source Library across several Target Libraries.
D2D Backup System HP D2D4112 77
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