HP StorageWorks 4000/6000/8000 .HP StorageWorks SAN Design Reference Guide, Pa - Page 279

15 SAN extension SAN extension enables you to implement disaster-tolerant storage solutions over long distances and multiple sites. This chapter describes the following topics: • SAN extension overview, page 279 • Fibre Channel long-distance technology, page 282 • Multi-protocol long-distance technology, page 290 • HP multi-protocol long-distance products, page 298 • HP storage replication products, page 323 • Certified third-party WDM, iFCP, and SONET products, page 352 SAN extension overview A SAN extension is an extended ISL connection between switches, typically linking two sites. An extended ISL is considered to be: • Any distance greater than: • 50 m for 8 Gb/s Fibre Channel • 150 m for 4 Gb/s Fibre Channel • 300 m for 2 Gb/s Fibre Channel • 500 m for 1 Gb/s Fibre Channel • Any distance between a pair of WDM, FCIP, or FC-SONET products NOTE: Fibre Channel distances listed here assume the use of type OM2 fiber optic cable. For the supported distances for each Fibre Channel speed and interconnect type, see "SAN fabric connectivity rules" on page 167. SAN Design Reference Guide 279