[INFO] What is this 'm' or 'u' after my numbers in graphs??

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rony
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[INFO] What is this 'm' or 'u' after my numbers in graphs??

Post by rony »

Because of the amount of resent post I have been seeing, and past, I have decided this is sticky information.

Basically, if you see a letter after a number on your graphs, it is an unit that rrdtool has converted that value to. This is done for readability. The following table gives you an idea of the possible units that will follow a number in your graphs.

Code: Select all

10^-18  a - atto
10^-15  f - femto
10^-12  p - pico
10^-9   n - nano
10^-6   u - micro
10^-3   m - milli
0    (no unit)
10^3    k - kilo
10^6    M - mega
10^9    G - giga
10^12   T - tera
10^15   P - peta
Last edited by rony on Fri Mar 09, 2007 9:54 am, edited 6 times in total.
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spex
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Post by spex »

If you have value's based on 1024 e.g. from storage devices the values shown are wrong. Can you tell cacti to handle that correct, or is a cdef the only solution.
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rony
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Post by rony »

In the data source, base value should be changed from 1000 to 1024.
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spex
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Post by spex »

I could not find the place where you can change the base value.
Looked at datasource and datatemplate and at rrd with rrdeditor.
Can you please explain a little more....
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rony
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Post by rony »

I should really consider sleeping more, it might help me to answer questions right.

It's actually a graph value not a data source value.

Sorry... :oops:
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spex
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Post by spex »

rony wrote:It's actually a graph value not a data source value.
I can not find the desired item.
Maybe you talk about a definition of cdef's or gprints.
But the scaling is as far as I know be done automatically by rrdtool.
So cdefs or gprints are not the right way.

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jt72
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Limit to x decimal places or specific notation?

Post by jt72 »

I am reading/graphing a value reported in tenths - eg 101 is value given back which equals 10.1 dBmV.

This works fine unless the value is between -9 to +9 (so -.9 to +.9 dBmV). In this case I get 900m instead of .9

Is it possible to restrict the values to one decimal place or to use a specific notation? It's not a big deal, but the data is represented in a way users are not familiar with.
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Post by BSOD2600 »

This is an rrdtool issue, so if you figure out how to do it (maybe reading through the manual), then yes, it can be possible ;-).
DervMan
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Post by DervMan »

Did you find a solution to this?

I too am getting 200m on the y axis when I want .20.

Thanks
mensmaximus
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Post by mensmaximus »

How your values are show below the graph is a matter of gprint settings. The predefined gprints have all a trailing %s which will "autoscale" numbers to milli, mega, peta and so on.

If you want to display your values in "real" format just define a new gprint preset (cacti console - management - graph management - gprint presets - add) named e.g. "myrealvalues" with %8.2lf as gprint text.

In your graphtemplate now all you have to do is to select "myrealvalues" as the gprint type for each graph item you want to display "real" numbers.
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Re: [INFO] What is this 'm' or 'u' after my numbers in graph

Post by jweinraub »

I know this was published quite some time ago, but I am still getting the suffix and load average already has

Code: Select all

%8.2lf
.

In here:

Image

It seems to only happen with 0.x mm. Once it gets above 1.0 mm, it is fine, e.g.:

Image

Any ideas as to why this is occurring?
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Re: [INFO] What is this 'm' or 'u' after my numbers in graph

Post by phalek »

The later Cacti versions have a pre-defined CDEF called "Exact numbers". Try that one
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Re: [INFO] What is this 'm' or 'u' after my numbers in graph

Post by jweinraub »

I am using exact numbers right now. It appears to be the same result.
Edit: I just added the exponent to zero. It seems to have done the trick.
Image

However, doing the same trick, won't work for this graph:

Image

It doesn't show the decimal so it has the same significant digits so the graph is fairly useless since pressure is rather subtle.
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