[ixpmanager] sFLOW graph limiting

[Paul Emmons]

Yes, I didn't think it would be that easy.  I'll watch our MySQL box and
maybe consider doing a slave of the database.

On Wed, Apr 27, 2022, 2:37 PM Nick Hilliard <nick at foobar.org> wrote:

> Paul Emmons via ixpmanager wrote on 27/04/2022 22:07:
> > The downside was that our sflow rrds got hosed.   Any thoughts of being
> > able to enforce an upper limit in the RRDs?
>
> this is not as simple as it looks.  Once you hard-code a limit into an
> RRD, it's difficult to change later because it needs to be done using
> "rrdtool tune --maximum"; this is problematic because you then need a
> second process outside the sflow-to-rrd script which handles
> provisioning changes. And then, which value do you set the max to - the
> ingress flow or the egress?  What if there's 100g ingress and 1G egress?
> What's the correct semantic value to use here?  One organisation will
> want to see the size of their DDOS; the other the utilisation on their
> link.  I.e. if you want fabric utilisation and congestion info, you
> would need to set all graphs on the IXP to be the size of the largest
> link on the entire IXP.
>
> Nick
>
>
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