Using the Event Monitoring Service (June 2007)

Glossary
volume group
Glossary 101
resource class A group of EMS resources
organized into a filesystem type structure.
Examples include system resources and
cluster resources. See resource instance.
resource dictionary A set of files that
provide to the registrar a hierarchy of
resources on the local system and respective
resource monitors.
resource instance The actual resources
that can be monitored. For example,
/net/interfaces/lan/status/lan0 may refer to a
particular network interface installed on the
monitored system. See resource class.
resource monitor The process that is used
to obtain the status of a resource and send
event notifications if appropriate. A monitor
checks resources on the local system. The
resource monitor maps the physical resource
into a standard interface understood by
EMS.
resource path A full resource path includes
the resource class hierarchy and instance.
S-T
SNMP (Simple Network Management
Protocol) Standard protocol for
network-based retrieval of information about
system resources.
state The current value of a resource (UP or
DOWN). For some resource instances, a
monitor may need to maintain a history of
past events or conditions in order to know
the resource value. In this case, a monitor is
said to be maintaining state information.
Stateless monitors do not keep any history of
past conditions.
target The target application is notified
when a monitored resource reaches the
condition for which notification was
requested. For example, a target application
could be MC/ServiceGuard or IT/Operations
(ITO).
U-Z
volume group In LVM, a set of physical
volumes whose extents are grouped together
and then made available to users as logical
volumes. A volume group can be activated by
only one node at a time unless you are using
MC/LockManager. MC/ServiceGuard can
activate a volume group when it starts a
package. A given disk can belong to only one
volume group. A logical volume can belong to
only one volume group.