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The disparity between the requirements for network-attached and FC SAN-attached CDP architectures requires firms to evaluate different criteria before buying a product. CDP products for network-attached corporate servers call for companies to examine storage utilization and data change rates on each server and then determine the impact that will have on source and target server performance, storage requirements and network bandwidth. FC SAN-attached CDP products will involve lengthier testing and configuration periods on a per-server basis. Admins will need to allocate new FC ports on FC SAN directors for the CDP appliance and sufficient new storage capacity to mirror the source server's production volumes; they'll also need to deploy new storage that matches the performance of the production database to keep the CDP journal.
In the end, reduced recovery time and backup software integration will be the deciding factors in product selection. FC SAN-attached CDP products offer almost immediate recoveries and allow applications to failover and operate on virtual volumes presented by the CDP appliance with minimal or no app performance degradation. If simplified backup and recovery is your primary objective, backup products with integrated CDP promise to dramatically lower recovery time objectives and recovery point objectives.
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