[rrd-users] Re: Randomly blocky graphs

Steven Hartland killing at multiplay.co.uk
Sat Oct 8 02:51:34 MEST 2005


Caught it doing it again tonight tried '--end now-300 --start end-10800'
still the same:
http://gaming.multiplay.co.uk/stats/players_day.png
Enabled debug in rrd_fetch results attached.

    Steve
----- Original Message ----- 
From: "Alex van den Bogaerdt" <alex at ergens.op.het.net>
> 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
> http://www.vandenbogaerdt.nl/rrdtool/
> 
> --
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> 
>

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