Using Serviceguard Extension for RAC, 6th Edition, April 2008

array configured with 16 I/O ports. Each node is connected to the array using two
separate Fibre channels configured with PV Links. Each channel is a dedicated bus;
there is no daisy-chaining.
Figure 1-6 Eight-Node Cluster with XP or EMC Disk Array
FibreChannel switched configurations also are supported using either an arbitrated
loop or fabric login topology. For additional information about supported cluster
configurations, refer to the HP 9000 Servers Configuration Guide, available through your
HP representative.
Extended Distance Cluster Using Serviceguard Extension for RAC
Basic 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 Understanding and Designing Serviceguard Disaster Tolerant
Architectures user’s guide, which discusses several types of extended distance cluster
Extended Distance Cluster Using Serviceguard Extension for RAC 33