SNMP Configuration and Management Manual

Host Resources Subagent
SNMP Configuration and Management Manual—424777-006
11-6
MIB Value Management
•
A dynamic object timer controls the rate at which hardware status and statistical
information is refreshed. Status information describes object states, such as
whether a device is up or down. Statistical information includes information such as
the current number of system users.
These two timers also control the rate at which software data is refreshed. Whenever
one of the timers runs down, values in the hrSWRun and hrSWRunPerf groups are
refreshed.
You set refresh timer values when you start the subagent, as describedStarting and
Stopping the Subagent on page 11-12. After the subagent is running, you can refresh
values on demand by setting the value of objects in the zhrmRefresh group from an
SNMP manager.
Although these counters control the rate at which most MIB values are refreshed, the
subagent also:
•
Uses an internal timer to refresh the average 60-second CPU load every 60
seconds
•
Updates the values of hrSystemDate and hrSystemUpTime in the hrSystem group
whenever these objects are accessed by a manager
MIB Value Management
To minimize the size of the subagent’s MIB, reduce the overhead of refreshing data,
and highlight certain critical resources, you can:
•
Limit entries in the hrSWRun and hrSWRunPerf groups to specific processes
•
Limit entries in the hrDevice group to specific devices
•
Suppress creation and maintenance of values in the hrSWRun and hrSWRunPerf
groups
The values maintained can be both preconfigured and dynamically altered. This ability
to maintain MIB values for a subset of hardware and software resources is particularly
useful for large hosts with many resources. It is also useful when you need to focus on
particularly critical resources.
Refer to Starting and Stopping the Subagent on page 11-12 for more information on
this topic.
Obtaining Information About the Subagent
Objects in the zhrmSaProcess group provide information about the subagent process.
Examples of information available are the name of the subagent process and statistics
about Get, GetNext, and Set requests the subagent has handled since starting.