[rrd-users] RRA

[fadwa salam]

Hello,
thank you for your answer,
but i think your idea is the same as making all in the loop to build it in
one go
the problem is: when i made rrdtool info rrd_file.rrd ,only one RRA is
created and took the last value of pdp and nb: it's mean pdp3 and nb3

2011/7/7 Simon Hobson <linux at thehobsons.co.uk>

> fadwa salam wrote:
>
> >I want to do a loop to create RAR archives by varying each time
> >pdp_per_row and number of records that will be given as arguments.
> >
> >    rrdtool create $ rrd \
> >              - start $ now \
> >              - step = $ step \
> >              DS: Power: GAUGE: 600: U: U
> >              RRA: AVERAGE: 0.5: $ pdp $ nb
> >
> >The problem is that I can not handle RAR alone. They are linked to
> >the process of the creation.
> >
> >if I put the whole process of creation inside the loop ,it create a
> >single RAR archive and take the last value.
>
> If I understand this correctly, you want build up an RRA piecemeal -
> create the basic file and then add RRAs to it one by one.
>
> This is not supported by RRD, you are expected to build it in one go
> - like this :
>
>   rrdtool create $ rrd \
>     - start $ now \
>     - step = $ step \
>     DS: Power: GAUGE: 600: U: U
>      RRA: AVERAGE: 0.5: $pdp1 $nb1
>     RRA: AVERAGE: 0.5: $pdp2 $nb2
>     RRA: AVERAGE: 0.5: $pdp3 $nb3
>
> Whilst there are tools for adjusting RRD files, I don't think it
> would be easy (or even possible ?) to do what you want with them.
>
> Possibly your best approach would be to make a "wrapper script" to
> consolidate the steps and then make one call to create the RRD file.
> Something along these lines :
>
> cmd_text="- start $ now \
>     - step = $ step \
>     DS: Power: GAUGE: 600: U: U \
> "
>
> while <some condition> do
>   <get consolidation>
>   cmd_text=`echo "${cmd_text} RRA:${cf_func}:${hb}:${pdp}:{nb} \
> "`
> done
> rrdtool create $ rrd ${cmd_text}
>
> --
> Simon Hobson
>
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