Using High Availability Monitors (June 2003)

Glossary
MIB II (MIB2)
Glossary96
Information” (SMI) format. This grammar
concisely defines the objects being managed,
the data types these objects take,
descriptions of how the objects can be used,
whether the objects are read-only or
read-write, and identifiers for the objects.
MIB II (MIB2) A MIB that defines
information about the system, the network
interface cards it contains, routing
information it contains, the TCP and UDP
sockets it contains and their states, and
various statistics related to error counts.
This MIB is widely adopted and is served by
most IP-addressed devices. Most system and
network resources managed by EMS are
taken from this MIB.
monitor See resource monitor.
N-P
notification See alert.
physical extent LVM divides each physical
disk into addressed units called physical
extents.
physical volume A disk that has been
initialized by LVM.
polling The process by which a monitor
obtains the most recent status of a resource.
PVG (physical volume group) Agrouping
of physical devices (host adapters, busses,
controllers, or disks), that allow LVM to
manage redundant links or mirrored disks
and access the redundant hardware when
the primary hardware fails.
PV links A method of LVM configuration
that allows you to provide redundant SCSI
interfaces and buses to disk arrays, thereby
protecting against single points of failure in
SCSI cards and cables.
Q-R
registrar The registrar process provides the
link between resource status consumers
(clients) and resource status providers
(resource monitors). The central part of the
resource monitor framework which uses the
resource dictionary to act as an intermediary
between client systems and resource
monitors.
resource May be any entity a monitor
application developer names. Examples
include a network interface, CPU statistics,
a MIB object, or a network service.
resource class A category of resources
useful during configuration. For example,
/net/interfaces/lan/status is provided as a
resource class.
resource dictionary A file describing the
hierarchy of resources that can be monitored
and the processes that perform the resource
monitoring.
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.
resource monitor A framework for
selecting resources of interest and
monitoring them according to the user's
criteria. When the resource value matches
the user's criteria, a notification is sent
according to the user's instructions.The
process that is used to obtain the status of a