Aggregate 95th Percentile

[chrisf]

I've created an Aggregate of 2 port on a catalyst 5500.

So
3/1 in
3/2 in
3/1 out
3/2 out
Total: ....

I want to graph the 95th percentile and print its value.

When I try to set the "data source" to none it fails to create the graph.
When I set it to the last data source(3/2) the 95th is calculated ONLY for that data source... How do I have the 95th calculate off of the summation of the data sources.

With total I created a CDEF:
cdef=ALL_DATA_SOURCES_NODUPS,8,*

And set data source to NONE.

This worked exactly how I wanted summing all the interfaces....

Any help getting the 95th to do the same would be appreciated.

-Chris F

[rony]

First, what version of Cacti are you running.

I would suggest that you be running 0.8.6h as there are more Nth Percentile functions.

Please install and review the documentation for 0.8.6h. If you have more questions, please let me know.

[chrisf]

First, what version of Cacti are you running.

I would suggest that you be running 0.8.6h as there are more Nth Percentile functions.

Please install and review the documentation for 0.8.6h. If you have more questions, please let me know.

I'm running 0.8.6h.
After reading over the docs I think I've got what I need...
But just wanted to point something out...
the "Interface - Traffic (bits/sec, 95th Percentile)" graph template calculates the 95th using max and only the outbound traffic...
Shouldn't it be using aggregate sum and no data source to show the 95th for both inbound and outbound traffic?

The ISPs I'm familiar with calculate 95th using the sum of the inbound and outbound traffic.

I've changed my 95th entry to aggregate sum and the output looks correct.


-Chris

[rony]

Shouldn't it be using aggregate sum and no data source to show the 95th for both inbound and outbound traffic?

Yes.

The aggregate functions where adding, mostly for service providers and ISP. As they are more likely to have graphs where multple interfaces of traffic needed to be calculated with a correct 95th percentile.

Please be warned, and the docs say this too, that Aggregate graph variables require more memory and processing power to process than other graph variables. Keep this in mind when you are using them as to not overload your system.

[chrisf]

Shouldn't it be using aggregate sum and no data source to show the 95th for both inbound and outbound traffic?

Yes.

The aggregate functions where adding, mostly for service providers and ISP. As they are more likely to have graphs where multple interfaces of traffic needed to be calculated with a correct 95th percentile.

Please be warned, and the docs say this too, that Aggregate graph variables require more memory and processing power to process than other graph variables. Keep this in mind when you are using them as to not overload your system.

One final note, attached are two graphs the first is our providers bandwidth graph.
The second is produced by cacti and is our uplink to the provider.
I'm shocked at how much larger the cacti chart's numbers are... Have I done something wrong?