Metrics and Techniques of True CDP

A true CDP solution needs to be time-addressable in order to recreate data exactly as it existed at any previous point in time and ensure fast recovery of critical data,. This means that data changes or snapshots of volumes need to be “time stamped,” and associated with a specific moment in time of the system’s operation. This time stamping is necessary so that they can be reviewed relative to the point when disaster occurred, in order to determine whether or not they are suitable points for recovery.

A true CDP solution also has to utilize the Recovery Point Objective (RPO) as its key metric, by protecting data with a very fine level of granularity. In other words, it simply must be able to recover data to any point in time. To do so, CDP solutions must be able to track data changes at the block, file, or application level, focusing down individual I/Os, data changes, or application events. As a secondary metric, the solution Recovery Time Objective (RTO) should also be low, meaning that the system can be restored to an uncorrupted point in time within a relatively short period of time.

Continuous Data Protection in StorTrends iTX

Until now, CDP has been more or less restricted to high-end enterprise-class storage systems due to the complexity and cost of implementing a reliable solution. But by capitalizing on the unique features of snapshot-capable iSCSI storage appliances, and placing the CDP functionality within the software rather than hardware, CDP is now within the reach of small and medium-sized businesses (SMBs), thanks to StorTrends iTX from American Megatrends (AMI).

The key benefits of CDP that allow organizations to reduce data loss (higher RPO) and perform quicker recovery of short-term data in the event of a data corruption or loss (lower RTO) are all presented at an attractive price in the innovative StorTrends® iTX storage software. StorTrends storage appliances, featuring the unbeatable combination of its Advanced Snapshot capability together with powerful Journal Assisted Replication offer outstanding data protection and value in a single product.

StorTrends® iTX combines its low-latency snapshot technology with efficient I/O journaling to offer a powerful, dependable CDP repository. The CDP services layer is very tightly integrated with the Journaling and Data Snapshot modules of the software. The snapshot technology in StorTrends iTX provides near-continuous data protection by creating and retaining hundreds of low-latency snapshots per volume at scheduled intervals, to produce numerous hourly, daily, monthly and yearly snapshots.

When combined with journaled storage, StorTrends iTX offers true CDP capabilities. Every write I/O is journaled, and entire volumes and application consistency groups can be rolled back to any point in time (APIT), to provide an instantaneous Recovery Point Objective (RPO). StorTrends iTX also features a “visual snapshot” interface to present a very intuitive and user friendly Snapshot Recovery Wizard for the selection, review, and rollback of snapshots. This near instantaneous rollback feature, paired with Redirect-on-Write (ROW) snapshots, enables StorTrends iTX to offer the industry’s fastest Recovery Time Objective (RTO), on the order of milliseconds in response time.

The Journaling module in StorTrends iTX registers with the caching/locking module above the DVM layer to provide I/O logging and support consistency groups. This module also tightly interfaces with the snapshot service to keep track of I/Os and events, forming the basis of event-addressable storage in StorTrends iTX. Journal files can be configured from up to 32 logical drives of any size to serve as event-addressable storage.

Want to Learn More?

For more information about the Continuous Data Protection (CDP) capability featured in StorTrends Data Storage appliances, log in to download the whitepaper from our Storage Library. If you haven’t already registered on StorTrends.com, click here to register and get started accessing detailed information on StorTrends products, including whitepapers, technical briefs, case studies, and more.