Re: [php-weathermap] feature

[Howard Jones <howie@xxxxxxxxxx>]

Travis Johnson wrote:
> Hi,
>
> I would like to request a new feature. I would like the ability to 
> display the maximum value for a link over the last XX number of hours.
>
> Example: I have several network maps that show current, real-time data 
> of all my backbone links. However, it would be very useful to just 
> enable a feature in the global config section and have it create an 
> additional map that shows the maximum value on all the links over the 
> last 24 hours.
I have something like this planned already. It won't be quite as you 
describe though.

You can use rrdtool's PRINT function to get it to calculate a VDEF for 
you over a period of time. That allows you to get monthly max, weekly 
average etc, but the syntax isn't the same as for a normal rrd target. I 
suppose for a limited number of cases it *could* be for the user, but by 
allowing any VDEF, it's much more flexible...

The downside of that is that it would be something you 'just enable'. 
Here's what I have in my notes for this:

rrdtool graph /dev/null -f "" -s now-30d -e now 
DEF:in=../rra/atm-sl_traffic_in_5498.rrd:traffic_in:AVERAGE 
DEF:out=../rra/atm-sl_traffic_in_5498.rrd:traffic_out:AVERAGE 
VDEF:avg_in=in,AVERAGE VDEF:avg_out=out,AVERAGE PRINT:avg_in:%lf 
PRINT:avg_out:%lf

to produce a 30 day average in/out value.  Change AVERAGE to any other 
CF as appropriate.

Maybe it should be two new features - the 'quick, just enable' version 
that translates from existing targets, and a more general one.

Howie