Using the Event Monitoring Service (June 2003)

Glossary
LVM
Glossary100
LVM (Logical Volume Manager) Software
that manages disks in volume groups, and
allows you to create logical and physical
volume groupings.
M
MIB (Management Information Base). A
document that describes objects to be
managed. A MIB is created using a grammar
defined in “Structure of Management
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 assigns identifiers for the
objects.
MIB II (MIB2) An MIB that defines
information about the system, the network
interface cards, routing information, the
TCP and UDP sockets 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 by LVM.
polling The process by which a monitor
obtains the most recent status of a resource.
The method is defined by the monitor when
it is created.
polling interval Determines the maximum
amount of elapsed time before the monitor
knows about a change in resource status.
protocol The method used to send
notification messages. The options through
EMS include: opcmsg, SNMP, TCP, UDP,
syslog, console, textlog and email.
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 Software that provides the link
between clients (resource status consumers)
and resource monitors (resource status
providers). 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 Any entity that a monitor
application developer names. Examples
include a network interface, CPU statistics,
a MIB object, and a network service.