HP StorageWorks Storage Mirroring Recover User's Guide (T5437-96008, November 2009)

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Chained
Description
The source servers sends replicated data to a target server, which
acts as a source server and sends data to a final target server, which
is often offsite.
Applications
This is a convenient approach for integrating local high availability
with offsite disaster recovery. This configuration moves the
processing burden of WAN communications from the source server
to the target/source server. After failover in a one-to-one, many-to-
one, or one-to-many configuration, the data on the target is no longer
protected. This configuration allows failover from the first source to
the middle machine, with the third machine still protecting the data.
Considerations
● The target/source server could become a single point of failure
for offsite data protection.
● You must pause the target when backing up database files on
the target.
Supported application configurations
Note: Blackberry Server and Exchange cannot be protected on the same machine.
Expand the following sections to view the configurations supported for each application.
Exchange
Exchange 2003 Exchange 2007
Source to target topology