Using EMS HA Monitors

82 Glossary
Glossary
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
HA Monitors 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 as an LVM disk.
PVG (physical volume group) A
grouping 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.
polling The process by which a monitor
obtains the most recent status of a
resource.
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.