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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