HP ProLiant 4500 Compaq ProLiant Cluster HA/F100 and HA/F200 Administrator Gui - Page 33

Planning Considerations, Cluster Configurations

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2-2 Compaq ProLiant Clusters HA/F100 and HA/F200 Administrator Guide Planning Considerations To correctly assess capacity, network, and failover needs in your business environment, it is important to have a good understanding of clustering and the things that affect the availability of clusters. The items detailed in this section will help you design your Compaq ProLiant Cluster so that it addresses your specific availability needs. s Cluster configuration design is addressed in "Cluster Configurations." s A step-by-step approach to creating cluster groups is discussed in "Cluster Groups." s Recommendations regarding how to reduce or eliminate single points of failure are contained in the "Reducing Single Points of Failure in the HA/F100 Configuration" section of this chapter. By definition, a highly available system is not continuously available and therefore may have single points of failure. NOTE: The discussion in this chapter relating to single points of failure applies only to the Compaq ProLiant Cluster HA/F100. The HA/F200 includes dual redundant loops, which eliminate certain single points of failure contained in the HA/F100. Cluster Configurations Although there are many ways to set up clusters, most configurations fall into two categories: active/active and active/standby. Active/Active Configuration The core definition of an active/active configuration is that each node is actively processing data when the cluster is in a normal operating state. Both the first and second nodes are "active." Because both nodes are processing client requests, an active/active design maximizes the use of all hardware in both nodes.

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2-2
Compaq ProLiant Clusters HA/F100 and HA/F200 Administrator Guide
Planning Considerations
To correctly assess capacity, network, and failover needs in your business
environment, it is important to have a good understanding of clustering and the
things that affect the availability of clusters. The items detailed in this section
will help you design your Compaq ProLiant Cluster so that it addresses your
specific availability needs.
■
Cluster configuration design is addressed in “Cluster Configurations.”
■
A step-by-step approach to creating cluster groups is discussed in
“Cluster Groups.”
■
Recommendations regarding how to reduce or eliminate single points of
failure are contained in the “Reducing Single Points of Failure in the
HA/F100 Configuration” section of this chapter. By definition, a
highly
available system is not
continuously
available and therefore may have
single points of failure.
NOTE:
The discussion in this chapter relating to single points of failure applies only to the
Compaq ProLiant Cluster HA/F100. The HA/F200 includes dual redundant loops, which
eliminate certain single points of failure contained in the HA/F100.
Cluster Configurations
Although there are many ways to set up clusters, most configurations fall into
two categories: active/active and active/standby.
Active/Active Configuration
The core definition of an active/active configuration is that each node is
actively processing data when the cluster is in a normal operating state. Both
the first and second nodes are “active.” Because both nodes are processing
client requests, an active/active design maximizes the use of all hardware in
both nodes.