HP Storage Mirroring V5.1 Software - Manual (Page 15)

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One-to-one, active/active
Description Each server acts as both a source and target actively replicating data to each
other.
Applications This configuration is appropriate for failover and critical data backup. This
configuration is more cost-effective than the Active/Standby configuration
because there is no need to buy a dedicated target server for each source.
In this case, both servers can do full-time production work.
Considerations Coordination of the configuration of Storage Mirroring and other applications
can be more complex than the one-to-one active/standby configuration.
During replication, each server must continue to process its normal workload.
Administrators must avoid selecting a target destination path that is included
in the source’s replication set. Any overlap will cause an infinite loop.
To support the production activities of both servers during failover without
reducing performance, each server should have sufficient disk space and
processing resources.
Failover and failback scripts must be implemented to avoid conflict with the
existing production applications.
Data from first source
Data from second source
Source and Target
(Active)
Target and Source
(Active)