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Article Excerpt
Disaster recovery is a hot topic again. Events like hurricane Katrina tend to make organizations reflect on their vulnerabilities--including asking their IT departments about that disaster recovery project started (but never quite completed) back in 2002.
Disaster recovery planning is quite a complex undertaking. It includes considerations such evaluating each application and data source to determine both a Recovery Point Objective (RPO) and a Recovery Time Objective (RTO). RPO is the amount of data that can be lost before it affects the organization, and RTO is the time it takes to recover and restart the server and application. Together, these provide guidelines for how current data must be and how fast it must be recovered. In actuality, most organizations discover that only a very few (if any) applications require an always available, RPO/RTO rating. According to a Gartner survey in 2005, only 18 percent of businesses implement transaction level replication to activate 100 percent uptime on any applications. Clearly these mission critical, always available applications are only a subset of the total applications in these businesses and the overall total percentage of applications treated in this manner would be much smaller.
Once the data has been classified, it becomes even more difficult to deal with as different solutions and extremely high cost software and infrastructure are involved in maintaining and managing all of the components. Faced with these complexities and costs, many businesses decide that comprehensive disaster recovery is...
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