[rrd-users] Re: Can interpolation be turned off?

[Alex van den Bogaerdt]

On Wed, Oct 16, 2002 at 11:38:30PM -0400, Josh Wyatt wrote:

> Reading in the Fine Tutorial (in the "Data Resampling" section", and
> confirming for myself, I see that RRDTool does interpolation when the
> timestamp on update doesn't exactly match (database start time) +
> (step)*x .

Indeed.  Therefore, if you update only at the right time, no resampling
will take place.  If "the right time" needs to be "any time", the
maximum step size for you is 1.

If you have a step size of 1 (seconds per PDP) and do *not* use the
AVERAGE CF, you won't end up with "1.2 people in the room".  There's
no need to have an RRA with 1 PDP per CDP.

For instance:
   RRA 1     300 PDPs per CDP   600 rows  CF=MIN
   RRA 2     300 PDPs per CDP   600 rows  CF=MAX
   RRA 3    1800 PDPs per CDP   600 rows  CF=MIN
   RRA 4    1800 PDPs per CDP   600 rows  CF=MAX
   RRA 5    7200 PDPs per CDP   600 rows  CF=MIN
   RRA 6    7200 PDPs per CDP   600 rows  CF=MAX
   RRA 7   86400 PDPs per CDP   732 rows  CF=MIN
   RRA 8   86400 PDPs per CDP   732 rows  CF=MAX

HTH
Alex

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