[rrd-users] More observations and questions on COUNTER
philip at vogon.net
Sun Oct 24 16:40:00 CEST 2010
On 10/24/2010 12:48 AM, Simon Hobson wrote:
>> 3. I really wanted the stored values to be the same as the input
>> values. They obviously are not, which seems odd since the sample
>> period is 30 seconds, and I take great care to ensure that the
>> values sampled as close to 30 seconds apart as I can, and then
>> entered with a time set to a 30 second boundary. I thought this
>> should ensure that the stored value would be precisely the
>> difference between the current and previous value.
> Can you point out anomalies ? I've had a very quick look and the
> numbers seem about right to me. You do understand that RRD tool only
> ever stores rates don't you ?
> Ie, updates of :
> 80741789 - 80740899 = 890
> 890 / 30 = 29.667
> value stored :
> 1287866370: 2.9666666667e+01
So you are saying the rate is always per second?
I thought it was rate per <sample period> ??
So a value stored at the exact end of a sample period would be equal to
the value presented.
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