Re: [rrd-users] Adding data in the past

[Steve Shipway]

> I want to add data in the past but cannot figure how to do so.

As Simon pointed out, you cannot do this, by design.  RRDTool performs
continuous consolidation of data which would not be possible were you able
to add data in the past.

If you have a large amount of historical data to add in one go, then you
could do it by creating a separate RRD file for this new data, then using an
RRD merge function to merge the two together.  I have an rrdmerge script in
the 'extras' directory of the Routers2 software distribution you can use,
and several other people have also created merge scripts; I think Tobi has
added merge functionality into the RRDTool 1.5 branch as well now.  This is
not ideal, though, as you still get a hiccup in RRA items which overlap both
sets, and you need to pick which RRD to use for which time window.  

Steve

Steve Shipway
T: +64 9 3737 599 ext 86487
E: s.ship...@auckland.ac.nz



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Re: [rrd-users] python-rrd doesn't know --left-axis-formatter

[Maxwell Carey]

On Wed, Mar 9, 2016 at 5:05 AM,  wrote:

> Hello there,
>
> I'm using python-rrdtool 1.4.8 (and rrdtool 1.4.8) on a raspberry Pi. It
> has been installed via apt-get from mirrordirector.raspbian.org
>
> When I try to use --left-axis-formatter in a rrd-graph, I encounter:
> rrdtool.error: unknown option '--left-axis-formatter'
>

The --left-axis-formatter option wasn't added until v1.5.0 (at least,
that's when it first appears in the documentation).


>
> And same thing if I try directly in bash.
>
> Do I need an earlier version ?


No, you need a later version.


> And more: why the last stable version is not in debian nor raspbian
> repositories ?
>

 Repositories usually don't contain the very latest releases of software
for stability and security reasons.
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[rrd-users] python-rrd doesn't know --left-axis-formatter

[crazycat]

Hello there,

I'm using python-rrdtool 1.4.8 (and rrdtool 1.4.8) on a raspberry Pi. It 
has been installed via apt-get from mirrordirector.raspbian.org


When I try to use --left-axis-formatter in a rrd-graph, I encounter: 
rrdtool.error: unknown option '--left-axis-formatter'


And same thing if I try directly in bash.

Do I need an earlier version ? And more: why the last stable version is 
not in debian nor raspbian repositories ?


Regards,
CrazyCat

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Re: [rrd-users] Adding data in the past

[Simon Hobson]

Olivier Nicole  wrote:

> I am stuck with aan annoying issue with rrdtool.
> 
> I want to add data in the past but cannot figure how to do so.

You can't That's a design feature, not a bug.

> So far, I have only added data now, but I want to reconstruct an history
> from data gathered from an older log file.

The *ONLY* way to do it is to start a new RRD file, with a start time before 
your first data point, and then feed the data in in increasing timestamp order. 
It gets tricky if some of the data you need to enter is actually in an RRD file 
and has already been consolidated - but that can (mostly) be worked around.


A bit more detail. RRD is not a regular database - it's a highly specialised 
one designed for one task (originally storing router traffic data). It doesn't 
have an arbitrary table that can have data inserted willy nilly - it has a 
circular buffer of predetermined size (set at database creation time) which 
only supports updated with time going forward (values actually stored depend on 
previous data).
In fact, other than (IIRC) the last value entered, not a single value you put 
in is stored ! All stored values are calculated on-the-fly and the data to 
update a previously entered value and recompute the stored value simply doesn't 
exist.

Alex has some great tutorials at http://rrdtool.vandenbogaerdt.nl
I suggest starting with "Rates, normalizing and consolidating" and "Describing 
the past, not predicting the future".

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[rrd-users] Adding data in the past

[Olivier Nicole]

Hi,

I am stuck with aan annoying issue with rrdtool.

I want to add data in the past but cannot figure how to do so.

So far, I have only added data now, but I want to reconstruct an history
from data gathered from an older log file.

I am trying:

$ rrdtool update PUA.Win32.Packer.Upx-48.rrd 1425432131:1 
ERROR: PUA.Win32.Packer.Upx-48.rrd: illegal attempt to update using time 
1425432131 when last update time is 1457517650 (minimum one second step)

Which obviously is not working, but I cannot see where is my error.

1425432131 is the tmiestamp for Wed Mar  4 08:22:11 2015

Thanks in advance,

Olivier


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