[Ntop] Hard Disk space and rrd dumps

[Jorge Cuevas]

Thanks again!!!

Best regards,

Jorge

burton at ntopsupport.com escribió:
> Each rrd file is a fixed size.  The number of rrd files that will be created is dependent on the traffic you are seeing.
>
> However, the parameters such as number of months determine the duration of the data that will be stored and thus (indirectly) the per-rrd size.
>
> If the rrd stores, say, 5 months of data, it will always have 5 months of data.  Today those five months would be mid-August -> mid-January.  Next month it will be mid-September -> mid-February.  Always 5 months, but which 5 months changes over time.  Hence the fixed size of the file.
>
> There is some information about rrd files in the FAQ and there (is/used to be) a write-up on SourceForge too.
>
>
> -----Burton
>
>
>
> It does delimit it in a way, but from my understanding it still depends
> on the amount of data your saving - which is directly proportional to
> the network I/O load ntop sees and/or is configured to store.
>
> 3 months of data on my network might be 2GB, while 3 months on your
> network might be 20GB.  Also, unless your load is predictable and
> constant, it will will vary on your network as well.  January might be
> slow and only consume 1GB, while March is really busy and needs 20GB.
>
> I would say it defines the amount of time stored on disk, but the amount
> of data would be unique to each install and probably pretty dynamic.
>
> Gary
>
>
> -----Original Message-----
> From: ntop-bounces at unipi.it [mailto:ntop-bounces at unipi.it] On Behalf Of
> Jorge Cuevas
> Sent: Friday, December 28, 2007 10:33 AM
> To: ntop at unipi.it
> Subject: [Ntop] Hard Disk space and rrd dumps
>
> Hi all,
>
> As far as I understand myrrd in ntop, historical data can be accessed
> and graphics can be developed once rrd starts keeping information in
> /ntop/rrd.
>
> >From the ntop web interface, I can access rrd plugin configuration
> options.
>
> Does the "dump months" parameter fix in any global manner the amount of
> time (months) of the maximum period to represent historical data?
>
> If so, this parameter is delimiting as well the amount of hard disk
> space, I mean, the maximum space which will be used if the dump month
> period is covered updating rrd? Is there any way to know how much hard
> disk space is equivalent to for example 3 months dump month?
>
> Thanks in advance,
>
> Jorge
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-- 
Jorge Cuevas González    	<jcuevas at nesys-st.com>
Director de Proyectos         	www.nesys-st.com
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