HP XC System Software Administration Guide Version 2.1

1
HP XC Administrative Environment
This chapter introduces the HP XC Administrative E nvironm ent and discusses key components.
The following topics are covered in this chapter:
• A description of nodes and services (Sec
tion 1.1)
• A discussion of Administrator passwords (Section 1.2)
• A description o f the secure shell as a means to access the HP X C system (Section 1.3)
• An explanation of the HP XC administra
tive commands (Section 1 .4)
• A discussion on th e HP XC c onfigu ration and management database (cmdb) (Section 1.5)
• A brief discussion on networking in the HP XC en vir onment (Section 1 .6)
• A discussion on local storage (Section
1.7)
• A description of key files and directories in the HP XC file system (Section 1.8)
• A discussion of system log files (Section 1.9)
• An introduction to modulefiles (Sect
ion 1.10)
• A brief description of the means by w h ich softw a re is distributed through the system
(Section 1.11)
• A discussion of suggested administrative tasks (Section 1.12)
1.1 Understanding Nodes, Roles, and Services
The HP XC system consists of ind ividual n odes that sup ply vario us services.
In this manual, a node is described based on the service it provides. Thus, management services
are hosted on a management hub node. Usually a node provides multiple services, so it can be
known by multiple nam es. A role is defined as an aggregate of related services.
_________________________ Note _________________________
Perform all system administrat
ion from the n ode that p ro vid es the app ropriate
service, usually the head nod
e.
The head node is the node tha t i s installed first. The head node is established with the alias
nh during in stallation . You can use this alias in command lines when you w ant to designate
the head no de.
In some con fig uratio ns the managem ent hub may be the head node; in other configurations,
they are two different nodes.
Other nodes are assigned se
rvices; examples are listed here:
• Compute
Compute nodes run the Simple Linux Utility for Resource Management (SLURM) that
enables them to launch, monitor, and control jobs.
By default, all n odes in th
e system are compute n odes.
• SLURM Central Control Daemon Service
The node that provides this service runs the daemon for the SLURM central control.
HP XC Administrative Environment 1-1