HP StorageWorks 2/140 FW 08.01.00 McDATA Products in a SAN Environment Plannin - Page 188

Implementing SAN Internetworking Solutions 4 routed SAN connection ensures disruptions at one site are isolated and not allowed to propagate to other locations. This connection does not support native FCP or FICON operation. Figure 4-11 SoIP Extended-Distance Connectivity Several network service providers provide long-distance IP or GbE network transport services. Long-distance circuits are common. The technology provides low overhead, low to medium bandwidth, point-to-point transport of storage traffic, and is a cost-effective choice for remote data replication. Technology Comparison Figure 4-12 illustrates the complex relationship between RTO, RPO, and extended-distance transport technology options. Extendeddistance operational modes (RDR/S and RDR/A) are directly associated with the transport technology choice. Note there is substantial overlap in the functionality provided by transport technologies and no single transport technology satisfies all BC/DR requirements. Comparison factors to consider are: • Repeated or unrepeated dark fiber - This technology supports medium-bandwidth, low-latency applications with short RTO and RPO requirements. Applications include real-time disk mirroring (RDR/S or RDR/A) over short to medium metropolitan distances. Unless one or more SAN routers are included in the extended-distance link (native FCP only), the technology is vulnerable to disruptions caused by fabric or link problems. 4-46 McDATA Products in a SAN Environment - Planning Manual