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IP SANs: A Guide to iSCSI, iFCP, and FCIP Protocols for Storage Area Networks by Tom Clark

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5.2. Layer 3–IP

IP has achieved near-universal acceptance as the network protocol of choice for data communication networks. Like Ethernet, this wide-spread adoption has not been the result of exceptional performance or design excellence, but of steady encroachment against competing solutions via availability, lower cost, and open systems orientation. Originally designed to withstand intense network disruptions (such as Cold War nuclear exchanges), IP provides only a best-effort delivery mechanism. On the surface this would make IP unsuitable for mission-critical storage applications, which demand guaranteed delivery of data to disk and tape. In practice, however, adapting an inherently laissez-faire protocol to the more rigorous requirements ...

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