D2D Replication Data Recovery Options; Restore Directly From The D2D Target Device; Reverse Replication On The D2D; Recovery Options Data Center Rebuild And Reverse Replication - HP StorageWorks 12000 - Virtual Library System EVA Gateway Manual

D2D Replication Data Recovery Options

Replication on D2D enables easier recovery of data in the event of a major site disaster. The data is
not instantly available but has to be recovered through a standard restore process using a backup
application. These scenarios look at what happens in the event of a total remote site disaster and lose
the server and the D2D appliance that was protecting it.
In the event of a total disaster at a remote site where the D2D Backup System and the servers it is
protecting are destroyed or damaged, the replicated data at the disaster recovery (target) site can
be accessed by means of a backup server on the remote site and transferred either to an application
or onto physical tape for distribution. Alternatively, when the damaged site is repaired the Virtual
Tape Library at the disaster recovery site can be used to "reverse replicate" to the Virtual Tape Library
at the previously damaged site.
Figure 38 Recovery Options — Data Center Rebuild and Reverse Replication
.

Restore Directly from the D2D Target Device

The first method of recovery uses the fact that there are probably more trained IT personnel at the
data center and equipment such as the spare servers may well be kept there. The HP D2D system
with replication can act as a source device, a target device or a non-replicating library (a library that
can be connected to a system and data recovered directly from the device). You can convert the target
library into a non-replicating library (by deleting the relevant replication slot mappings), construct a
new server at the data center, hook up the D2D device, and recover the unique server data. Once
complete, the new server and a new D2D can be shipped to the remote site and replication
reestablished.

Reverse Replication on the D2D

A second method of recovering is to perform a function called reverse replication. The data is copied
back from the target to the new source appliance at the remote site. When this is complete, the remote
site can be rebuilt and the server recovered from the data now available on the remote site. The effect
HP StorageWorks VLS and D2D Solutions Guide 95