Nimbostratus
Employee
https://support.f5.com/kb/en-us/products/big-ip_ltm/manuals/product/LTM_config_guide_943.pdf.pdf
Page 12-38
With an SNMP DCA type of monitor, you can check the performance of a
server running an SNMP agent such as UC Davis, for the purpose of load
balancing traffic to that server. With this monitor you can define ratio
weights for CPU, memory, and disk use.
Performance monitors are generally used with dynamic ratio load balancing.
Page 12-39
When configuring an SNMP DCA custom monitor, you can use the default
CPU, memory, and disk coefficient and threshold values specified in the
monitors, or you can change the default values. Optionally, you can specify
coefficient and threshold values for gathering other types of data. Note that
if the monitor you are configuring is for a type of SNMP agent other than
UC Davis, you must specify the agent type, such as Win2000.
To understand how to use the coefficient and threshold values, it is
necessary to understand how the overall ratio weight is calculated. The
overall ratio weight is the sum of relative weights calculated for each metric.
The relative weights, in turn, are based on three factors:
• The value for the metric returned by the monitor
• The coefficient value
• The threshold value
Given these values, the relative weight is calculated as follows:
w=((threshold-value)/threshold)*coefficient
You can see that the higher the coefficient, the greater the relative weight
calculated for the metric. Similarly, the higher the threshold, the greater the
relative weight calculated for any metric value that is less than the threshold.
(When the value reaches the threshold, the weight goes to zero.)
Nimbostratus
I can't say I dove too deep into the manual...But at least I know where to find it now. BTW it was a very good explaination, I'm trying to locate the default weights for each node and where can I alter that?