I've found that copying over the rrd to be the most reliable way to maintain history.

If I've migrated a port and forgotten to copy the rrd at the time, then I just do an rrdmerge of the two ports later to collate the data together.

It also means that you can delete/purge the original rrd if that port is going to be re-purposed for another use and you don't want the history polluting that graph.

M





On 10 Feb 2021, at 8:50 pm, Markus Klock via observium <observium@observium.org> wrote:

One trick is to create a port group of the old port and the new port and graph the traffic of the port group.
This way you will generate one graph with both the new and old data combined. 

Den ons 10 feb. 2021 10:38Klimek, Denis via observium <observium@observium.org> skrev:

Hi Arne,

 

we are using the Billing Module to store important data of transit uplinks. Maybe this fits your requirements too?

 

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igfb

 

Von: observium <observium-bounces@observium.org> Im Auftrag von Arne Van Theemsche via observium
Gesendet: Mittwoch, 10. Februar 2021 09:39
An: observium@observium.org
Cc: Arne Van Theemsche <arnevt@gmail.com>
Betreff: [Observium] best practices regarding interface switching and historical data

 

Hi,

 

I was wondering how you guys tackle the problem of changing the port of (e.g. your transit uplink)  to another physical port & historical data. Since rrd's are stored under "port-<snmpid>" format, this event causes you by default to loose your historical data. Or even worse, you have to change your routing engine with a more recent version, and after replacing it seems all your snmp id's are changed.

 

this is certainly of importance for our interfaces which have a label that automatically creates aggregates graphs.

How I do this until now is copying the rrd file to the new location, but this seems so... dirty

 

kind regards

Arene

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