HP XC System Software Administration Guide Version 3.1

Do not assign 1 to both the head_node_required and
head_node_desired parameters. If you assign 1 to the
head_node_required parameter, assign 0 to the
head_node_desired parameter.
head_node_desired
Assigning 1 to this parameter indicates that running the service
on the head node is beneficial but not necessary.
Assigning 0 indicates that the service does not benefit from
running on the head node.
Do not assign 1 to both the head_node_required and
head_node_desired parameters. If you assign 1 to the
head_node_desired parameter, assign 0 to the
head_node_required parameter.
external_connection_required
Assigning 1 to this parameter indicates that the service requires
an external connection.
Assigning 0 indicates the service does not require an external
connection.
Do not assign 1 to both the
external_connection_required and
external_connection_desired parameters. If you assign
1 to the external_connection_required parameter,
assign 0 to the external_connection_desired parameter.
external_connection_desired
Assigning 1 to this parameter indicates that an external
connection is beneficial, but not necessary.
Assigning 0 indicates the service does not require an external
connection.
Do not assign 1 to both the
external_connection_required and
external_connection_desired parameters. If you assign
1 to the external_connection_desired parameter, assign
0 to the external_connection_required parameter.
exclusivity_desired
Assign 1 to this parameter if the service requires the exclusive
use of a node. If so, you must also specify the
exclusivity_group parameter.
Assign 0 if the service does not need the exclusive use of nodes.
exclusivity_group
Provide a name for the nodes for the service. The name is an
alphanumeric identifier (underscore characters are permitted),
but it must begin with an alpha character.
Services specifying the same exclusivity group name are
assigned to the same node or nodes from the correspondingly
named group of exclusive nodes.
The [A]nalyze menu option of the cluster_config utility examines the parameters for each
service.ini file and generates a report similar to the following:
[L]ist Nodes, [M]odify Nodes, [A]nalyze, [H]elp, [P]roceed, [Q]uit: A
Recommended Cluster Configuration
----------------------------------------------------------------
3 Total nodes
1 Nodes assigned service roles
0 Exclusive servers
1 Non-exclusive servers
3 Compute nodes
70 Managing and Customizing System Services