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Configuring a Data Collection Module
114084 Rev. A 7-19
Statistics Group
When you enable the DCM, the RMON agent automatically creates a Statistics
configuration that records data for each network interface. Through your RMON
network management application, you can create as many Statistics
configurations as memory permits, up to the RMON limit of 65,535
configurations.
If you create multiple configurations, it is possible to collect the same set of
statistics for the same interface in multiple data tables. The absolute values of
those statistics may vary from table to table, because the baseline of each statistics
counter occurs when you create a configuration. You may prefer, however, to use
only one Statistics configuration to conserve memory for other RMON groups.
You need 200 bytes of memory for each Statistics configuration.
History Group
When you enable the DCM, the RMON agent automatically creates a History
configuration that collects History data at two intervals. The first configuration
provides short-term history by sampling statistics every 30 seconds and holding
up to 50 samples (in RMON terms “buckets”). The second configuration provides
long-term history by sampling statistics every 30 minutes and holding up to 50
buckets.
Through your RMON network management application, you can create as many
History configurations as memory permits, up to the RMON limit of 65,535
configurations.You can also set the number of buckets that a particular History
configuration uses to as many as available memory allows. If you request more
buckets than memory allows, the agent allocates enough buckets to fill available
memory.
You need 504 bytes of memory for each History configuration (252 bytes each for
the short-term and long-term History configurations).
The History data requires 52 bytes of memory per bucket. You calculate the total
memory (in bytes) that you need to store the data as follows:
Number of buckets * 52 * 2 History configurations
This calculation shows that you need approximately 5.1 KB for the default setting
of 50 buckets.
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