SNMP Configuration and Management Manual

Host Resources Subagent
SNMP Configuration and Management Manual—424777-006
11-100
Routing Traps
Routing Traps
Traps from the Host Resources Subagent are routed to SNMP managers identified in
the SNMP agent’s TRAPDEST objects. Refer to Configuring Trap Destinations on
page 2-38 for more information on this topic.
Enabling Traps
By default, all subagent traps are enabled whenever the subagent is started.
You can disable zhrmRAMThreshold and zhrmDiskThreshold traps at startup by
assigning these values to the -h and -i startup parameters:
-h 100
-i 0
When the subagent is running, you can set the value of several MIB objects to enable
or disable traps:
Thresholds and Traps
Two of the traps are generated when RAM or disk utilization reaches a high or low
threshold value: zhrmRAMThreshold and zhrmDiskThreshold.
Figure 11-6 illustrates how the high and low thresholds regulate trap generation. When
the subagent starts, the high and low thresholds are defined by the -h and -i startup
parameters. As RAM or disk utilization fluctuates, these thresholds are deactivated,
and reactivated and traps generated:
•
When RAM or disk utilization reaches the high threshold value, a trap is generated.
In addition, the high threshold is deactivated so that oscillations around it do not
cause repeated trap generation.
•
When RAM or disk utilization drops to the low threshold value, another trap is
generated and the low threshold deactivated to prevent repeated trap generation
as utilization fluctuates around the low threshold. The high threshold is reactivated.
•
Because the high threshold is activated, another trap is generated when RAM or
disk utilization reaches it. Then the high threshold is deactivated and the low
threshold reactivated.
zhrmDevUnTrapEnable This zhrmDevUnavail group object enables or disables
the zhrmTrapDeviceStateChange trap.
zhrmThrRAMTrapEnable This zhrmThreshold group object enables or disables the
zhrmRAMThreshold trap for RAM storage areas being
utilized too much.
zhrmThrDiskTrapEnable This zhrmThreshold group object enables or disables the
zhrmDiskThreshold trap for disk devices being utilized
too much.