Horizontal cluster topology
A horizontal cluster consists of at least two nodes with a single cluster instance in each node. Each node in the cluster typically represents a unique WebSphere Portal installation on a unique physical system. Horizontal clusters, like vertical clusters, provide a means of expanding the capacity and availability of the portal site, but unlike vertical clusters, each horizontal cluster instance has a unique set of physical resources (CPU and memory) and thus is not affected by other horizontal instance resource requirements.
The following diagram illustrates a horizontal cluster. All of the cluster nodes are on individual servers. The nodes are grouped into a cell and managed by a single Deployment Manager. All of the node use a common database and LDAP server. The database and LDAP server could also be clustered and in high traffic networks or networks where failover and recovery are critical, the database and LDAP server would typically be clustered in order to avoid a single point of failure.
Parent topic:
Server topologiesRelated concepts
Single-server topology
Stand-alone server topology
Vertical cluster topology
Combination of horizontal and vertical clusters
Multiple clusters
Single-server topology for Web Content Management
Dual-server configuration for Web Content Management
Staging-server topology for Web Content Management
Cluster