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Chapter 6. Support for Content Restoration and Fail-

Over

Some common uses of DX Content Router are disaster recovery, backup, and archiving. In all these

cases, it will sometimes be necessary to recover lost content data from a remote cluster. The exact

nature of such a recovery process, and the ease and speed with which it happens, will depend

somewhat on the topology of the cluster network.

If the topology involves a one-way connection between the primary and DR clusters, then recovering

from a disaster that causes loss of data, perhaps because one or more nodes in the primary cluster

have been destroyed, must involve an administrative process to reverse the data flow. That's

because the primary cluster in such a topology is running only a Publisher service, which moves

data from the primary to the DR. In order to move data in the other direction for recovery purposes,

the primary cluster (and perhaps also the DR cluster) will need to be reconfigured to run one or

more Replicators, allowing the DR site to reconstitute lost data in the primary. Any lost data will be

unavailable until the loss is discovered and corrected by the two Content Router nodes.

Note

Administrators who temporarily install a Replicator or Publisher service on a DX Content

Router node as part of a DR event should plan to uninstall the temporary service when

all of the original objects have been replicated back to the source cluster. Failure to do so

may result in unintentional creation of a mirrored configuration when the cluster returns to

normal since both services will be installed on the same server.

In a mirrored architecture where the primary and DR clusters are both running paired Publishers

and Subscribers, the DX Content Router nodes will ensure that all appropriate data exists in both

clusters at all times. If there is a disaster in the primary cluster, the data can be repopulated using

the "Republish" function in the DR Publisher admin console.

In both the above scenarios, the loss of data can be corrected, but will be unavailable to applications

in the primary cluster until the DX Content Router nodes do their jobs and recover the data. If these

applications are made aware of the presence and address of the remote DR cluster, and if they

have visibility and access to the remote, then the applications can automatically fail-over to the

remote cluster in the event a stream is not currently accessible in the primary.

Version 2.2

December 2010