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.
This chapter discusses several types of Extended Distance
Cluster that use basic Serviceguard technology with software mirroring
(using MirrorDisk/UX or Veritas VxVM) and Fibre Channel. Both two
data center and three data center architectures are illustrated.
This chapter discusses the following:
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