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Performing SNMP Sets

SNMP Sets are used to define the alerting thresholds for management information or to set SNMP

configuration information. Because these operations are considered sensitive, the Insight Management

architecture does not send SNMP Sets over the open SNMP connection between SIM and the

managed server. Instead, they are sent over the secure https channel link that SIM establishes with the

System Management Homepage framework. These Set requests are then sent to the Microsoft SNMP

Agent Service which passes them to the appropriate HP SNMP Extension Agent and then to an Insight

Management Agent. In the HP Insight Management Agents architecture, all SNMP Sets are passed to

and executed locally by the Foundation Agent as part of its extended functionality.

One function of a management system is to deliver alerts whenever the values for key system

parameters exceed or fall below the threshold values that have been set for them, or whenever

important system events occur. For example, a system administrator may want to be alerted whenever

disk utilization exceeds 85%. The Insight Management Agents architecture uses SNMP Trap

notifications to deliver these alerts to the SIM server, where they are processed and then displayed for

the system administrator on the SIM console.

Several different components of the Insight Management architecture, including parts of each of the

four Insight Agents, monitor the MIB and process the information to determine when to issue alerts.

 Remote Alerter Threads. Each Insight Management agent has a remote alerter thread that is

responsible for monitoring its portion of the HP MIB in the Windows Registry for Registry change

events. When the thread detects a change that requires an alert, such as a threshold being

exceeded, it writes an event to the Windows Event Log with a pre-defined Event ID.

 The HP Trap Thread. This extension to the Microsoft SNMP Agent Service scans the Windows Event

Log for alert events that have been written to it by the Remote Alerter Threads. It also detects other

key events in the log that should generate an alert.

 The Microsoft SNMP Agent Service. Based on the events selected by the HP Trap Thread, the

SNMP Agent Service generates the actual SNMP Traps that are sent to the SIM server for display

on the management console.

The Insight Manager alerting architecture is shown in Figure 2. This is a slightly more detailed view of

one section of the overall Insight Agents architecture shown in Figure 1.