Simple Serviceguard clusters are usually configured in a single
data center, often in a single room, to provide protection against
failures in CPUs, interface cards, and software. Extended Serviceguard
clusters are specialized cluster configurations, which allow a single
cluster to extend across two or three separate data centers for
increased disaster tolerance. Depending on the type of links employed,
distances of up to 100 km between data centers can be achieved.
Refer to Chapter 2 of the Designing Disaster Tolerant
High Availability Clusters manual, which discusses several
types of extended distance cluster that use basic Serviceguard technology
with software mirroring (using MirrorDisk/UX or Veritas VxVM) and
Fibre Channel.
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