Port bandwidth over 100G can't shown properly on Obervium graph

Hello,I'm NOC from T-Mobile NL. Here we have a case have to get support from your side.
The issue is that Obervium do not show data in the graph when the interfaces have bandwith highter than 100G, which there is a similiar case with

https://jira.observium.org/browse/OBS-2872

But in the comments:

You can modify this setting : 

$config['max_port_speed'] = 12500000000; // Max port speed in RRD; default 100Gbit. Only used upon RRD creation!

And delete the port's RRD file. This will recreate the rrd database with a higher maximum value.

So could you help to specific the procedure to guide us delete port's RRD file, please? Many thanks.