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Yet there are caveats related to using host-level replication software instead of backup or CDP software. Not all host-level replication software products catalog or track the copied versions of replicated data. This necessitates the continued use of backup software at the central site to maintain older copies of the replicated data. Vendors' definitions and deployments of CDP also differ. Steve Duplessie, founder and senior analyst at Milford, MA-based Enterprise Strategy Group, refers to the features of products like EMC Corp.'s RepliStor as "kCDP" or "kinda CDP" because while they let users create multiple point-in-time data snapshots, they differ from true CDP functionality where each write I/O is journaled and users can recover data from any specified point in time.


 

Host-level replication software is available in three distinct architectures: Windows-only file system, multi-OS file system and multi-OS block-level products. Each alternative offers specific features that make it a better fit for some types of data protection. Key features like real-time failover,

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bidirectional replication, and tools for sizing bandwidth and data compression make some host-level replication software products better equipped for enterprise deployments.

This was first published in December 2006

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