Using the Event Monitoring Service (June 2007)

Glossary 99
Glossary
A-H
alert An event. A message sent to tell a user
or application when that certain conditions
are met, an action or state you want to know
about. For example, you may want to be
alerted when a disk fails or when available
filesystem space falls below a certain level.
asynchronous monitor A monitor that
monitors resource instances (or resource
class) asynchronously. It is event driven and
send notifications when events occur. It does
not keep track of the current state or value of
each resource it monitors.
client The application that creates or
cancels requests to monitor particular
resources. The consumer of a resource status
message. A user of the Resource Monitor
framework. This user may browse resources,
request status, and make requests to have
resources monitored. Examples are
MC/ServiceGuard as it starts a package or
the HP SMH interface to EMS.
dictionary See Resource Dictionary.
Event Monitoring Service (EMS) A
means to create requests, monitor, and
report events about resources on a system.
EMS observes a system and does not modify
it.
EMS Framework A set of APIs together
with the registrar process and the resource
dictionary, which allows client applications
to request that resources be monitored and a
target application be notified.
EMS API The interface between the
registrar, client applications, target
applications, and resource monitors.
EMS GUI The HP SMH interface to EMS.
One type of a client application, use it to
create monitoring requests.
ems cli A command line utility that is used
to configure and manage persistent
monitoring requests for Event Monitoring
Service (EMS) monitors, such as, HA
Monitors, Hardware Monitors and Kernel
Monitors.
event An alert.
HA High Availability.
I-L
ITO HP OpenView IT/Operations, formerly
known as Operations Center
logical extent The basic allocation unit for
a logical volume is called a logical extent. For
mirrored logical volumes, either two or three
physical extents are mapped for each logical
extent, depending on whether you are using
2-way or 3-way mirroring.
logical volume The segments of spaces
that can be separated physically on a disk or
be on serial disks. Each collection appears to
the operating system as a single disk. Like
disks, logical volumes can be used to hold file
systems, raw data areas, dump areas, or
swap areas. Unlike disks, logical volumes
can be given a size when they are created,
and a logical volume can later be expanded
or reduced. Also, logical volumes can be
spread over multiple disks.
LUN (Logical Unit Numbers) A logical disk
device composed of one or more physical disk
mechanisms, typically configured into a
RAID level.