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In order to minimize the amount of data transported over WAN links, StorTrends iTX offers two
types of data reduction features: compression and data deduplication. Whereas compression is a
pervasive and therefore well understood technology, deduplication is much more of an emerging
concept, and is considered to be something of a 'Holy Grail' for storage appliances. This section
will explain the data deduplication implementation of StorTrends iTX for WAN replication.
Like many of its competitors, StorTrends® employs delta-snapshot technology to transfer only
the data that has changed between passes in order to reduce the amount of data transported. In
addition to this, StorTrends® also employs an intelligent data-dedupe algorithm to filter out
some of the previously transmitted data from earlier passes. This technique provides significant
benefits for database applications, in particular.
At its most basic level, StorTrends iTX employs an optimal delta-snapshot replication technology
for the implementation asynchronous replication; the figure below illustrates the concept.
Figure 5:The Delta Snapshot Replication Technology behind Asynchronous Replication in StorTrends iTX
Appendix J : WDS and Deduplication in StorTrends iTX 307
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