HP XC System Software Installation Guide Version 4.0

• “Common Role” (page 218)
• “Compute Role” (page 218)
• “Console_network Role” (page 218)
• “Disk_io Role” (page 219)
• “External Role” (page 219)
• “Ldap_server Role” (page 219)
• “Login Role” (page 219)
• “Management Hub Role” (page 219)
• “Management Server Role” (page 220)
• “NIS Server Role” (page 220)
• “Node Management Role” (page 220)
• “Resource Management Role” (page 221)
• “Voltaire_hsm Role” (page 221)
You can define multiple roles on any node. The head node, in particular, can have all of these
roles if you are setting up a small cluster.
If you need more information about services and node roles, see the HP XC System Software
Administration Guide.
F.3.1 Availability Role
The availability role is automatically assigned to all nodes that are members of availability
sets. You cannot assign this role to any node.
The configuration and management database names of the services provided by the
availability role are avail and translate.
The avail entry points make configuration specific changes for availability including configuring
the node to run the configured availability tools. The translate entry point calls the availability
tool scripts, which traverse the configuration and management database to obtain information
about services configured for availability. The availability tool scripts create the configuration
files necessary to enable the availability tool on the nodes on which it was configured.
F.3.2 Avail_node_management Role
Assign the avail_node_management role to fail over services on the head node that are usually
supplied by the node_management role.
In this release, the following services are supplied by the avail_node_management role:
• dbserver (database server)
• hptc_cluster_fs (hptc_cluster file system)
• kdump (crash dump)
• ntp (Network time protocol)
• pwrmgmtserver (power daemon server)
If you assign the avail_node_management role to another node in an availability set with the
head node, power management features are also configured on that other node. This provides
you with the ability to control power on the nodes in the cluster in the event that the head node
is unavailable.
The HP XC NTP configuration supports multiple internal servers. If you assign the
avail_node_management role to another node in an availability set with the head node, the
head node and the other node are both configured as peers and internal NTP servers for the
cluster.
Because you cannot assign the node_management role to any other node except the head node,
the avail_node_management role was developed to accomplish that task.
Never assign the avail_node_management role to the head node. Assign the
avail_node_management role only to the second node in an availability set to fail over the
services.
F.3 Role Definitions 217