HP Storage Mirroring Software - Manual (Page 15)

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Replication
Replication is the real-time transmission of file changes. Unlike other related technologies, which are based on a disk driver
or a specific application, Storage Mirroring’s replication process operates at the file system level and is able to track file changes
independently from the file’s related application. In terms of network resources and time, replicating changes is a more efficient
method of maintaining a real-time copy of data than copying an entire file that has changed.
After a source and target have been connected through Storage Mirroring, file system changes from the user-defined
mission-critical data are tracked. Storage Mirroring immediately transmits these file changes to the target machine. This
real-time replication keeps the data on the target machine up-to-date with the source machine and provides high availability
and disaster recovery with minimal data loss.
Unlike mirroring which is complete when all of the files have been transmitted to the target, replication captures the changes
as they are written to the source and sends them to the target continuously. Replication keeps the target up-to-date and
synchronized with the source.
Source Target
User/Application
updates
part of a file
Only the changed
portion of the file
is replicated
Up-to-date
copy maintained
on the target