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, then 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.