[rrd-users] Maximum number of data sources/max cdef size.

Andreas Maus a.maus at science-computing.de
Fri Feb 9 18:12:38 CET 2007

On Fri, Feb 09, 2007 at 05:02:27PM +0000, George Barnett wrote:
> Hi,
> I'm aggregating boxes into a graph to draw a cluster and I'm getting
> null values.
> Is there a maximum number of datasources in 1 graph?
> Is there a maximum size of a cdef?
> I've found that if I do this with only a few DS's, it works fine.  Maybe
> somebody has tried this before?
> My graph command is below:

Hi George.

I guess that there is a upper limit, but I don't think you reach it ;)
I'm doing similar graphs for 166 nodes, with 4 DS for each node
(CPU stats: user,nice,system,idle) without any problem
(using rrdtool 1.2.12 - yes I know thats old ;).
(This includes several CDEF statements like sorting out unreachable nodes, etc. )

Whats puzzling me are your strange (at least for me) looking
DEFs. e.g.:


Whats these sql thingy? Do you store your data in an SQL database ?
If yes, maybe thats the problem. I'm storing my data in plain rrd files.



Dipl.-Ing. Andreas Maus             science+computing ag
System Administration               Hagellocher Weg 73
mail: a.maus at science-computing.de   72070 Tuebingen, Germany
tel.: +49 7071 9457 456             www.science-computing.de
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 189 bytes
Desc: not available
Url : http://lists.oetiker.ch/pipermail/rrd-users/attachments/20070209/c1fda6a2/attachment.pgp 

More information about the rrd-users mailing list