HP StorageWorks 64 FW 07.00.00/HAFM SW 08.06.00 McDATA Products in a SAN Envir - Page 192

Implementing SAN Internetworking Solutions 4 • IP - This technology supports low-bandwidth, high-latency applications with long RTO and RPO requirements. Applications include asynchronous disk backup or tape vaulting over metropolitan to extended (intercity) distances. SAN routers are included in the extended-distance link (iFCP only), so the technology isolates the connected SANS and prevents disruptions caused by fabric or link problems. Table 4-4 compares and contrasts the transport technologies. Table 4-4 Transport Technology Comparison Requirement Bandwidth (native storage) Extended-link latency Dark Fiber Medium Low Network scalability Performance monitoring Extended distance (greater that 120 Km) Security Routed SAN benefits Fair Average No Good No WDM High Low Good Average No Good No SONET/SDH Medium Medium Fair Good Yes Good No IP Low High Good Good Yes Good Yes Additional factors to consider are: • Availability of a physical infrastructure - If fiber-optic cable is available, WDM is a good choice because of high bandwidth, low cost, and ease of use. SONET and SDH connectivity is generally available within metropolitan and intercity regions. IP provides the highest level of long-distance connectivity but supports only low-bandwidth, high-latency applications. • Bytes of data requiring backup - The volume of data associated with the SAN is a consideration in selecting the transport bandwidth. As an example, the approximate time required to perform a 60-terabyte backup is: - 50 days over a single OC-3 connection. - One week over a single GbE connection. - Three hours over a 2 Gbps, 32-channel WDM connection. 4-48 McDATA Products in a SAN Environment - Planning Manual