HP XC System Software Installation Guide Version 3.0

• SuperMon aggregator (supermond)
• Syslogng (syslogng_forward)
These services are used to support scaling of the cluster. Nodes with this role provide local storage for
aggregation of system logs and performance information. Management hub services typically report up to
the node with the management_server role.
You can assign this role to several nodes of the cluster, and HP recommends that you consider using one
management hub for every 64 to 128 nodes.
Management Server Role
The management_server role contains services that manage the overall management infrastructure. Only
one node in the system can have the management_server role; in this release, the head node has this
role.
The management database names of the services provided by this role are as follows:
• Apache Web server (httpd)
• Nagios aggregator (nagios)
• Nagios service (nsca)
NIS Server Role
The nis_server role is not enabled by default. Assigning this role to a node configures the node as a NIS
slave server. If you assign this role to a node, you will be prompted to enter the name of your NIS master
server and NIS domain name during cluster_config processing.
Any node assigned with the nis_server role must also have an external Ethernet network connection
defined.
The management database name of the service provided by this role is nis_server.
Node Management Role
Nodes with the node_management role run a number of services that help manage other nodes in the
system. This role is restricted to the head node; it cannot be removed.
The management database names of the services provided by this role are as follows:
• Console management facility master (cmf)
• Database server (dbserver)
• Dynamic Host Control Protocol (DHCP) server (dhcp)
• HPTC file system server (hptc_cluster_fs)
• License manager (hptc-lm)
• Image server (imageserver)
• HP MPI interconnect setup (mpiic)
• Myrinet switch monitor (gmmon)
• NFS server (nfs_server)
• Network time protocol (ntp)
• Power daemon server (pwrmgmtserver)
• Quadrics switch monitor (swmlogger)
The MySQL database, in which all management configuration information is stored, runs on a node with
this role.
The power manager service manages the powering on and off of nodes in the system.
The MPI interconnect settings are managed by nodes running this role.
The image server service provides images from the SystemImager tool to all client nodes.
The NTP server synchronizes the time on all nodes.
94 Node Roles, Services, and the Default Configuration