Specifies if more than one instance can start on a single
node. By configuring vertical stacking, the application placement
controller can start more than one instance of the dynamic cluster
on the node when a large workload exists.
Use vertical stacking to improve bottleneck conditions
between applications. Select Allow more than one instance
to start on the same node, and type the Number
of instances value. The number of instances is the number
of application servers for a cluster that are needed to use all the
power of a node. Also, the number you choose for vertical stacking
is the number of servers that are automatically created.
If you use target nodes for vertical stacking
that are at an older product version than the deployment manager version,
adding new members on the same node is disabled. Vertical stacking
is available only on application servers, WebSphere Application
Server Community Edition servers, and PHP servers that have cluster
members that are automatically defined by rules.