HP XC System Software Administration Guide Version 3.2

• Image server service
The golden client maintains an image of the file system that is the model for all the nodes
in the HP XC system. SystemImager is the underlying technology used to install the HP XC
software, distribute the golden image, and distribute configuration changes. With the
SystemImager, you can update every node with systemwide information, such as user
account data.
Note:
The golden client and SystemImager are bound to the same node.
• Configuration database server
The node assigned this service is the MySQL configuration database server for this system.
For additional information on the configuration database, see “Configuration and
Management Database” (page 38) .
• Dynamic Host Control Protocol (DHCP) server
This service assigns IP addresses for all devices on the internal network based on the DHCP
server node's Machine Access Control (MAC) address.
• Power daemon service
The power subsystem daemon enables you to turn on, turn off, cycle, and reset power on
individual nodes, and also report whether a node's power is on or off.
This daemon is automatically assigned to the head node.
For additional information on nodes and services, see the HP XC System Software Installation
Guide.
1.1.3 Roles
A role is defined as an aggregate of related services.
1.2 File System
Proper maintenance of the file system is crucial to the operation of the HP XC system. This section
describes key directories and offers guidelines for the maintenance of the file system.
The basic file system layout is the same as that of a standard Linux file system. Additions to the
layout for the HP XC system are described in this section.
Figure 1-1 illustrates the top of the file system hierarchy for a node in the HP XC system.
Figure 1-1 HP XC File System Hierarchy
1.2 File System 29