Using High Availability Monitors (June 2003)

Glossary
volume group
Glossary 97
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.
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 groupcan be activatedby
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.