nagios && rrd

[Stanley Hopcroft]

Dear Sir,

I am writing to thank you for your letter but say I think you are 
mistaken.

On Wed, Apr 16, 2003 at 07:45:56AM +0200, Fred Albrecht wrote:
> 
> Except off course if your client does not want data loss, like mine 
> does.  They need to go back to any five minute interval,
>  anywhere in a three month range.
>

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

Here is an RRA that keeps 5 minute observations for 3 months

filename = "SONI_RTM.rrd"
rrd_version = "0001"
step = 300
last_update = 1050059101
ds[TotalDelayAverage].type = "GAUGE"
ds[TotalDelayAverage].minimal_heartbeat = 600

  ...

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
)

If on the other hand, you mean any 5 minute interval with no loss of 
accuracy, in the life of the monitoring, then as you say, it's necessary 
to store the data exactly in the persistent store of your choice - and 
worry about its maintenance etc.

I think however that for a lot of time series data, the RRD approach of 
keeping whatever number of observations you declare when you design your 
RRDs - depending on queries, graph sizes etc - and consolidate that data 
with averages or maxima for periods longer than that time, you are get 
the best of both worlds.

Perhaps I am missing the point ?

> fred

-- 
------------------------------------------------------------------------
Stanley Hopcroft
------------------------------------------------------------------------

'...No man is an island, entire of itself; every man is a piece of the
continent, a part of the main. If a clod be washed away by the sea,
Europe is the less, as well as if a promontory were, as well as if a
manor of thy friend's or of thine own were. Any man's death diminishes
me, because I am involved in mankind; and therefore never send to know
for whom the bell tolls; it tolls for thee...'

from Meditation 17, J Donne.


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