Disaster Recovery Patterns
In general, you should consider three main DR patterns when trying to achieve Level 1 through Level 4 DR.
Active/Passive DR Sites Pattern
Figure 56.2 illustrates the active/passive DR sites pattern. This typical disaster recovery configuration is probably the most common in the world (for those who are doing DR). It involves a primary site (the normal environments in which you do business day in and day out) and a passive DR site. This passive DR (alternative) site can be anything and anywhere. It could be a “hot” alternate site that is ready for you to apply a current database backup to (and application image, too), or it could be a “cold” alternate site that you have to either go out and lease, co-locate with, or ...
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