IBM BS029ML - WebSphere Portal Server, Self Help Manual

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Chapter 2. Architecture and planning
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In this section, we provide a high-level overview of the two of the most common deployment
options.
The dual cluster with Two Lines of Production architecture
Figure 2-6 depicts a dual clustered WebSphere Portal Server V6.0.x architecture supporting
“Two Lines of Production”. Each “Line of Production” consists of multiple WebSphere Portal
Server cluster members and accesses that are effectively the same community,
customization. and wmm database domains. Such domains are said to be “shared” and are
responsible for ensuring a consistent user experience. The sharing of the database domains
ensures that data is automatically available to both “Lines of Production”. The one exception
to this is the release database domain associated with each “Line of Production”, as each
release domain maintains unique data specific to that “Line of Production” or cluster.
Figure 2-6 Database domains in a dual clustered WebSphere Portal Server V6.0.x architecture
Any user customization made against one cluster member, regardless of the “Line of
Production” or cluster, by a user, is now available to the same user, as and when that user
accesses any of the other cluster members participating in the same or different “Line of
Production”. It should be acknowledged, however, that under normal conditions session
affinity is maintained against the same cluster member for the duration of a user's session.
The only exception to this is when a cluster member becomes unavailable, either through a
deliberate or an unscheduled outage.
Figure 2-6 also shows a separate database server containing a shared JCR database.
Although not mandatory, it should be acknowledged that a JCR database will have very
different growth rates and performance characteristics from the main Portal domain
databases. Architecting a separate database, as such, possibly in a different database
instance or on a different physical database server, is one common option.
Portal
Portal
Portal
Portal
Portal
Portal
Portal
Portal
Database Server
WMM
Release A
Community
Customization
Release B
Portal Cluster
Line of Production B
Portal Cluster
Line of Production A
Database Server
JCR