With the improved availability feature, the HP XC System Software transfers
management of specific services and nodes to an availability tool.
During the cluster_config operation, you define
a set of nodes and services as an availability set. The availability
tool manages the configured services and the nodes, and relocates
the service to another configured node in the event of a node failure.
The availability tool is not bundled with the HP XC System Software;
you must order it from the manufacturer and install it according to
the manufacturer's prescribed installation procedure. The HP XC System Software Installation Guide provides
information on the installation needs of the availability tool.
One such availability tool is HP Serviceguard,
which is shown in examples in this chapter. If you prefer to use another
availability tool, for example, the open source Heartbeat tool, you
can create scripts in a tools-specific directory to run the necessary
commands. For more information, contact the HP XC support
team at:
<xc_support@hp.com>
The software for the availability tools is located
in a directory that the manufacturer chooses. The HP XC System Software provides
a directory, /opt/hptc/availability/, under which
tool-specific directories are created. These subdirectories contain
scripts and routines that automate the configuration and management
of the availability tool on the HP XC system.
During the system startup, which is discussed
in Chapter 3, you issue a command that transfers the control of specific services
previously assigned to a node in an availability set to the availability
tool. This tool manages those services, aliases, and the failover
from one node to another.
The availability tool monitors the node health,
services, and aliases. If, for example, a node fails, the availability
tool restarts the services that node was responsible for on another
node in its availability set.
Before reconfiguring the HP XC system,
you must issue another command to remove its aliases and to return
control of the services from the availability tool to the HP XC system.
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