nagios && rrd

[Fredrik Wänglund]

I usually set up the RRDs to store minute-values for the last 35 days 
(50400 rows) and hour-averages for the last 5 years (.43800 rows) This
makes the files around 1.5Mb for each DS.
Performance is not really affected by the number of rows since the 
filesize is constant and rrdtool store new values by inserting it at a 
'floating' insertion-point (if the rrd is 'full',rrdtool will always 
overwrite the oldest value). This is why it's called rrd, Round-Robin 
Database.


/FredrikW


Fred Albrecht wrote:

>Please visit www.tiscali.co.za
>
>
>Hi Stanley
>
>  
>
>>If you mean a 3 month interval from the current time, then 
>>provided that 
>>the RRD has been designed to keep that number of data points (ie the 
>>RRA that uses only 1 data point contains that number of rows eg
>>    
>>
><snip> 
>  
>
>>rra[0].cf = "AVERAGE"
>>rra[0].rows = 32768
>>rra[0].pdp_per_row = 1
>>rra[0].xff = 5.0000000000e-01
>>rra[0].cdp_prep[0].value = NaN
>>rra[0].cdp_prep[0].unknown_datapoints = 0
>>rra[0].cdp_prep[1].value = NaN
>>rra[0].cdp_prep[1].unknown_datapoints = 0
>>)
>>    
>>
>
>Ah, I've learnt something today! ;)  From my background with cricket I never really messed with the details of rrd, cricket simply configured the rrd for me.  The default time (I think) that cricket takes is to keep the records "uncompressed" for about two days, then averaging starts.  
>
>How would rrd handle 3000+ datafiles with 32k+ rows each?  Any idea what kind of performance impact this will have?
>
>Thanx for clearing this up.
>
>:)
>fred
>
>
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