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There are three
approaches to data replication in the Client-Server environment and focusing on
the SMB (small to medium size business) market;
·
Host based
·
Array (storage device) based
·
Network (appliance) based (a blend of hardware
and software)
Before investing
in each, and organization must perform some type of Business Impact Analysis
(BIA))to determine cost justification. Consider two scenarios;
·
Bank or organizations with large amounts of
in-flight transactions would need real-time replication (low DRO- see section 4.7.1) if the cost of losing the data justifies
the cost to implement the technology (Typically $30K+ leased line)
·
A medical office enters Exam data into a
Electronic Medical Record system (EMR) that averages 20 exams per hour, would
only loose 2 exams with a RTO of 5 minutes for a typical Array based storage
system ($10K). Host based, at a cost of $500 per server, would be more cost
effective.
This document
will review existing technologies related to data replication in the industry
and provide insight on recommended uses and applications. A comparison of
selected products will be used to demonstrate technology application.