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Figure 4-12
SAN Extension Technology Comparison
•
WDM - This technology supports high-bandwidth, low-latency
applications with short RTO and RPO requirements. Applications
include peer-to-peer computer clustering (grid computing) and
real-time disk mirroring (SDR or ADR operational mode) over
short to medium metropolitan distances. WDM scales to higher
bandwidths at a lower relative cost than SONET or SDH. 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.
•
SONET and SDH - These technologies support medium-
bandwidth, medium-latency applications with short-to-long RTO
and RPO requirements. Applications include asynchronous disk
backup or tape vaulting over metropolitan to extended (intercity)
distances. Unless one or more SAN routers are included in the
extended-distance link (native FCP or iFCP), the technology is
vulnerable to disruptions caused by fabric or link problems.
Implementing SAN Internetworking Solutions
Implementing SAN Internetworking Solutions
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