Owner's Manual

758 Active Performance Monitor
See Monitors on page 770 for a more the beginning of a more general description of how to create
and configure monitors.
NOTE:
OpenManage Network Manager Active Performance Monitoring supports monitoring SNMP devices
and subcomponents that support the IETF Entity MIB Definition (RFC 2037, 2737 and/or 4133) without
requiring a specific OpenManage Network Manager Device Driver for that device type.
Retention
The basis of all reporting and dashboard presentations is retained data from established monitors.
In other words, each monitor provides a simple schema from which you can produce a chart, graph
or report.
To reduce resource impacts, the scope of retained data may exclude some of the collected data. A
monitor may have no retained data and only emit events based on transient results in the
execution/calculation.
For example, the application can derive a metric from several collected values and you may opt to
retain only the derived result.
All monitors rely on a polling engine which provides runtime mediation activities for distributed
device interaction at regular intervals.
Several types of monitors are available in this release:
- SNMP Attributes (Interfaces or Scalars) - Scalars are compatible with any SNMP agent, but do
not support indexing for table support. This integrates with inventory at the chassis level.
-
SNMP Interface —Compatible with any SNMP agent supporting the IF-MIB and integrates to
managed inventory at the subcomponent level. Supports data in any table indexed by an
ifIndex value.
- See Monitor Entities on page 773 and following for more about these monitors.
All monitors have the following behaviors:
-
Retention —To retain monitor data, a retention policy is associated with the monitor. Monitors
may share a retention policy. The retention policy controls how long data is held per roll-up
period.
Reachability state —The reachability of the target agent is determined per collection interval.
Any state change results in an event which updates the alarm view.
Availability state —The availability of the target is determined per collection interval. Availability
is retained according to the monitor retention policy. Any state change results in an event which
updates the alarm view.
Calculated Metrics—Any numeric values collected by the monitor may be used to produce derived
metrics. A metric is defined by an algebraic formula which may include collected values.