[rrd-users] Time Shift on Trend Graph

Chris Mason chris at netnix.org
Fri Jun 28 15:45:50 CEST 2013


I have been through the documentation and I can't seem to find a way for
the graph to grow from the left instead of the right.
So, I thought I might try and do it manually by fetching the "first" entry
from the rrd - similar to the "last" function.

However, as I should have expected, although last returns the last input
into the rrd, first is returning the first entry for the RRA, not the first
time that I inserted data.

Is there any way to determine the first time I inserted data into the RRA
as opposed to the start of the RRA period?


On 25 June 2013 16:05, Chris Mason <chris at netnix.org> wrote:

> Hi,
> 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":
> LINE1:DS1Trend#808080::dashes';
> 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?
> Thanks,
> Chris
> 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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