[rrd-users] Re: rrd update

[Alex van den Bogaerdt]

Owen DeLong wrote:
> 
> As I understand it, DERIVE is only for counters that get reset on
> _EVERY_
> read.  This wouldn't help in his case, because the RESETS are random.

I think you're confusing ABSOLUTE and DERIVE.  What you describe
is the ABSOLUTE data source type.  The DERIVE data source type is
like a counter, except that it can also produce a negative delta
(which isn't possible using a COUNTER).

In the documentation:

" Internally, derive works exaclty like COUNTER but without
  overflow checks. So if your counter does not reset at 32 or 64 bit you
  might want to use DERIVE and combine it with a MIN value of 0.
"
Random resets are one example of counters that don't reset at 2^32 or
2^64.  Don't forget the MIN value ...

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