[rrd-users] Re: Randomly blocky graphs

Alex van den Bogaerdt alex at ergens.op.het.net
Fri Oct 7 20:18:12 MEST 2005

On Fri, Oct 07, 2005 at 04:30:20PM +0100, Steven Hartland wrote:

>  '--start', -10800,
>  '--width', '500',

No '--end' so use the default of 'now'.  'Now' is almost always later than
the last update time of the database, you may want to change that.

[snip 8 times DEF:       {servers,players}{avg,max,min,last}]
[snip 6 DEFs being used: {servers,players}{avg,max,last}]

This will not be the source of the problem, but why graph 6 out of 8 ?

> step = 300
> rra[0].cf = "AVERAGE" > rra[0].rows = 288 > rra[0].pdp_per_row = 1
> rra[1].cf = "AVERAGE" > rra[1].rows = 700 > rra[1].pdp_per_row = 6
> rra[2].cf = "AVERAGE" > rra[2].rows = 372 > rra[2].pdp_per_row = 24
> rra[3].cf = "AVERAGE" > rra[3].rows = 730 > rra[3].pdp_per_row = 288
[snip similar RRAs but with {max,min,last}]

There should always be enough PDPs available in the RRA with 1 PDP per CDP.
I've looked at the RRA selection mechanism and cannot see why it would
select another RRA.  I even ran a test program, using various values for
start,end and for last update of the database.  It always returned RRA 0.

In other words: no bug found.  If there is one, I couldn't find it.

Perhaps this solves your problem: do specify '--end', let it be a whole
multiple of 300 and let it be in the past, not in the future.

Alternatively: specify '--end now-300 --start end-10800'.

Alex van den Bogaerdt

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