Guaranteed benefits A "health insurance" perspective turns the economics of DR on its head. It is no longer necessary to justify a DR investment based on an unpredictable event-a disaster-that is unlikely to happen in any given year. Instead, the benefits are guaranteed to accrue every time it is necessary to perform maintenance that would otherwise shut down operations.Continuous Data Protection (CDP), which may be included in an AIX HA solution or implemented as a separate product, provides the missing piece of the puzzle. Rather than maintaining a replica server, it saves individual data updates. Those updates can then be used to restore an individual data item to a particular point in time should the need arise. DR is too complex a topic to discuss in its entirety here. The point is that it is much easier to justify an investment in full-spectrum business continuity "health insurance" than the costs of basic disaster recovery "life insurance." Rich Krause is a Senior Product Marketing Manager at Vision Solutions. Rich has more than 20 years of experience in product marketing, product management and product development in the enterprise software marketplace. Rich is a frequent speaker and writer on topics related to data protection and business continuity. Prior to joining Vision Solutions, Rich was director of technical services for Clear Communications. He can be reached at Richard.Krause@visionsolutions.com.
However, while a HA solution may be the ultimate in DR, it does not provide a way to recover from data corruption or accidental deletion. The problem is that the HA replicator will likely immediately replicate any data corruption or accidental deletion to the backup system. The result is that there will be two copies of the corrupted data and no copies of the data before the corruption or deletion.