HP StorageWorks Storage Mirroring user's guide (T2558-96073, February 2008)

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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.
Considerations
The target/source server could become a single point of failure for offsite data protection.
Source Target and Source Target