[rrd-users] Time Shift on Trend Graph

Chris Mason chris at netnix.org
Tue Jun 25 17:05:39 CEST 2013


I suppose the other option, if I am unable to achieve what I wanted, is to
only draw the trend line from the start of the actual data.
I use the following logic to draw a trend line for data source "DS1":


Is it possible to restrict the trend line to start when my data started
instead of at the beginning of the graph?
I would assume that any value within DS1 that was before my data would be
classified as unknown - is my DS1Trend CDEF removing the unknowns?


On 23 June 2013 13:17, Chris Mason <chris at netnix.org> wrote:

> Hi,
> I have the following graph which displays daily maximums over a period of
> a year:
> http://netnix.org/graph.png
> I have added a trend line to the graph using the Least Square Lines
> method. I am currently shifting the graph by 3 months using the following
> method:
> -s -1y+3months -e now+3months
> This works fine, but I wanted to try and shift the graph so the start of
> the graph is at the left most point and the graph is only ever displayed in
> the first 9 month period. It is easy if I only ever had more than 9 months
> worth of data, but if I only had 3 months worth of data, then I am looking
> for the graph to still start from the left with only the left 3 months
> being used?
> I am looking to try and do something similar to the "Filesystem
> Utilization and Predicted Trends" graph in the RRDTOOL gallery where in the
> picture, the graph is using the left hand side and the trends go into the
> right hand side.
> Any pointers?
> Thanks,
> Chris
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