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P-Guide Continuous Data Protection
Productive's P-Guide: Continuous Data Protection (CDP), A Closer Look
Date Published: September 23, 2008
Format: PDF
Length: 4 pages
Excerpt:
In the last few years, an answer has emerged in the form of a new generation of disk-based backup technologies. Generally lumped together under the term “Continuous Data Protection” (CDP), these systems allow for faster backups and nearly instantaneous data recovery.
What exactly is CDP? There are numerous definitions floating around. For instance, the Storage Network Industry Association (SNIA) defines it as a “a methodology that continuously captures or tracks data modifications and stores changes independent of the primary data, enabling recovery points from any point in the past.” IDC has defined it like this: “Continuous data protection, also referred to as continuous backup, pertains to products that track and save data to disk so that information can be recovered from any point in time, even minutes ago.”
How does CDP work? In part, the answer depends on the product and vendor. There are some fundamental differences in system types, however. The block-based approach is perhaps the most common these days. It works by capturing blocks of data as they are created and them storing them to an independent location. In contrast, file-based CDP solutions record file-system changes—creation of new files and modification or deletion of older ones, etc. Another type, application-based CDP, works from within a specific application and can be designed as part of the application itself.
Date Published: September 23, 2008
Format: PDF
Length: 4 pages
Excerpt:
In the last few years, an answer has emerged in the form of a new generation of disk-based backup technologies. Generally lumped together under the term “Continuous Data Protection” (CDP), these systems allow for faster backups and nearly instantaneous data recovery.
What exactly is CDP? There are numerous definitions floating around. For instance, the Storage Network Industry Association (SNIA) defines it as a “a methodology that continuously captures or tracks data modifications and stores changes independent of the primary data, enabling recovery points from any point in the past.” IDC has defined it like this: “Continuous data protection, also referred to as continuous backup, pertains to products that track and save data to disk so that information can be recovered from any point in time, even minutes ago.”
In other words, CDP protects and captures data as it is written to disk and automatically saves every change made to any item of data on a company’s system. By doing so, it can restore data to their condition before a loss or interruption occurred—and often in a matter of minutes or even seconds. The result: less data loss, potentially less business downtime, and an effective to find a balance between RTO and RPO.
One key distinction to keep in mind is the difference between “pure CDP” and “near-CDP.” Pure CDP systems provide infinite point-in-time recovery options, while near-CDP systems allow users to restore data to specific points in time through the creation of data snapshots.
How does CDP work? In part, the answer depends on the product and vendor. There are some fundamental differences in system types, however. The block-based approach is perhaps the most common these days. It works by capturing blocks of data as they are created and them storing them to an independent location. In contrast, file-based CDP solutions record file-system changes—creation of new files and modification or deletion of older ones, etc. Another type, application-based CDP, works from within a specific application and can be designed as part of the application itself.
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