Hi Rob,
Rob Royan wrote:
We are looking at implementing JFFNMS to monitor over 700 Cisco
routers and switches. Initial plan is to just replace MRTG as our
performance monitor. Other functions will be implemented later on. There are a couple of differences between the two programs that I
would like information on.
1. I would like to understand how the RRD files and Graphing is implemented within JFFNMS.
My understanding is that MRTG keeps track of a single day of polling and then condenses historical data into ever larger chunks of averages. A 'withpeak' configuration parameter provides the option of keeping track of the max value within each chunk of data. With the two values graphed one can see the average utilization along with the peaks that were experienced. A useful tool when looking at condensed information.
From what I have been able to find on the mailing list, I understand that JFFNMS does not condense any RRD data. The files are created with the capacity of holding a year's worth of 5 min polls. Is this true? Is there any compression done, be it within the graphing process or elsewhere? Would there be any value in adding a MAX Peak traffic line on the graphs or would the line just follow the Average?
Yes, that is true, I've never nedded to add a MAX DS to the RRDs, you could try it modifiying the Interface Type configuration.
2. With MRTG we are currently monitoring some interfaces on a one-minute polling cycle. I believe our reasoning behind this is outdated but I would like to find out what capabilities JFFNMS has in this capacity.
What I have found so far... When selecting a host with one minute polling cycles and the new poller the expected snmp traffic occurs in one-minute intervals. When looking at the graphs generated, they are still in 5-minute steps. The interface polling is set to: "When Poller Runs" and the rrd files were deleted and recreated. Am I missing a configuration step, or is this as expected?
This is true, the poller can poll in a 1 minute interval, but the graphs are in 300 seconds intervals, this can be changes in the "RRD Structure Step" field in the Interface Type configuration.
I am very impressed with what I see so far and commend you on the work you have done.
Good, I'm glad you like it.
Rob
Javier
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