[rrd-users] RRD files with more than one data source

permalink · #1 (**permalink**) 08-27-2007

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Hi List,

=20

I'm new to RRDtool and have some basic questions about organizing RRD
files.

=20

=20

>From looking at the documentation and the code it seems that both update
and graph (uses internally fetch) commands always use explicitly or
implicitly all DS defined in a given RRD file.

=20

When using update it seems that even if <-template> option is used -
still unknown value is set to any non mentioned DS.=20

When fetch is used there is no way in the API to relate to a specific DS
and all are fetched.

=20

If I'm correct:

It seems reasonable to put some DS in same RRD file just if those DS are
really updated together and may be used together to build graphs.

Otherwise to use different RRD files - Each RRD file per DS.

=20

=20

But on the other hand:

What about disk space when many files are used?

What about performance as each update requires open and closes the file
- while bulk update of different DS in same RRD file can be done in one
update call?

=20

My questions:

=20

Am I correct in my understanding the APIs?

Is it recommended to define some DS on same RRD file?=20

If yes when it's recommended?

=20

=20

Any help is appreciated.

=20

=20

Thanks,

=20

Yishai.

=20

=20

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<div class=3DSection1>

Hi List,<o:p></o:p>

<o:p> </o:p>

I’m new to RRDtool and have some basic
questions about organizing RRD files.<o:p></o:p>

<o:p> </o:=
p>

<o:p> </o:p>

From looking at the documentation and the code =
it
seems that both update and graph (uses internally fetch) commands always =
use explicitly
or implicitly all DS defined in a given RRD file.<o:p></o:p></font=
>

<o:p> </o:p>

When using update it seems that even if <-te=
mplate>
option is used - still unknown value is set to any non mentioned DS. <o:p=
></o:p>

When fetch is used there is no way in the API t=
o relate
to a specific DS and all are fetched.<o:p></o:p>

<o:p> </o:p>

If I’m correct:<o:p></o:p><=
/p>

It seems reasonable to put some DS in same RRD =
file
just if those DS are really updated together and may be used together to =
build
graphs.<o:p></o:p>

Otherwise to use different RRD files - Each RRD=
file
per DS.<o:p></o:p>

<o:p> </o:p>

<o:p> </o:p>

But on the other hand:<o:p></o:p>=


What about disk space when many files are used?=
<o:p></o:p>

What about performance as each update requires =
open
and closes the file – while bulk update of different DS in same RRD=
file can
be done in one update call?<o:p></o:p>

<o:p> </o:p>

My questions:<o:p></o:p>

<o:p> </o:p>

A=
m I correct
in my understanding the APIs?<o:p></o:p>

I=
s it recommended
to define some DS on same RRD file? <o:p></o:p>

I=
f yes when
it’s recommended?<o:p></o:p>

<o:p> </o:p>

<o:p> </o:p>

Any help is appreciated.<o:p></o:p></fon=
t>

<o:p> </o:p>

<o:p> </o:p>

Thanks,<o:p></o:p>

<o:p> </o:p>

Yishai.<o:p></o:p>

<o:p> </o:=
p>

<o:p> </o:=
p>

</div>

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If you have received this email in error please notify the system manager=
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