HP XC System Software Installation Guide Version 4.0

F.3.3 Cisco_hsm Role
This role defines where the optional Cisco InfiniBand Host Based Subnet Manager runs. The
service associated with this role is called ib_sm. For more information about when this role is
required, see Section F.2.1 (page 215).
HP recommends that you assign this role to the head node and another service node. Assigning
this role to another service node enables the Subnet Manager, and therefore the InfiniBand
network, to continue to function even if the head node is down.
Either the cisco_hsm or the voltaire_hsm roles might be present in a system, but not both.
F.3.4 Common Role
The common role is automatically assigned to all nodes, and it cannot be removed. This role runs
services that must be present on every node.
The configuration and management database names of the services provided by this role are as
follows:
• Node data collection with the collectl utility (collectl)
• Hardware information gathering (gather_data)
• Environmental monitoring for the HP ProLiant DL585 server (hpasm)
• HPTC file system client (hptc_cluster_fs_client)
• IP firewall (iptables)
• IP firewall for IPv6 (ip6tables)
• Network adapter setup (network)
• Nagios remote plug-in execution agent (nrpe)
• Parallel distributed shell (pdsh)
• SLURM launch (munge)
• Disk monitoring on the HP Integrity rx1620 (smartd)
These services provide functionality that is required on all nodes and are fundamental to the
proper functioning of the cluster.
F.3.5 Compute Role
Jobs are distributed to and run on nodes with the compute role. This role provides the services
required for the node to be an allocated resource of the SLURM central control service (slurmcd).
On systems with fewer than 63 total nodes, this role is assigned to all nodes; on large-scale systems
with more than 64 nodes, this role is assigned exclusively to nodes with no other roles assigned.
Any node with this role may be called upon to execute jobs scheduled by the users. Nodes with
this role are also often called compute nodes.
It is your responsibility to remove this role on a node if it is not wanted or required.
To enable monitoring of the nodes, run the Nagios remote plug-in execution agent on nodes
with the compute role.
F.3.6 Console_network Role
The console_network role enables you to map HP XC services with physical console
requirements to the appropriate nodes. By default, this role is assigned to the same set of nodes
as the management_hub role. In system installations in which only specially designated nodes
can access the console network, you can assign this role to those nodes instead, and the
management and monitoring tools use only those nodes.
You must assign the console_network role to nodes that have console access. Otherwise,
Nagios plug-ins that require console access will not collect data.
The configuration and management database names of the services provided by this role are as
follows:
• Console management facility master (cmf)
218 Node Roles, Services, and the Default Configuration