[rrd-users] Find first non-NaN value in RRD?

[David Carmean]

I need to programmatically choose between dozens, if not a hundred, 
pairs of RRD files to determine which have the "best" or the "most" 
data.  One of the things I'm doing is an rrddump and fgrep to count 
the number of non-NaN samples.  But I also need to find the first 
and last non-NaN values in the the RRD.  There's only one ds per 
RRD (Zenoss).  rrdfirst is not behaving as I'd expect.  It gives 
me the first/oldest slot, no matter whether it has a valid sample or 
not.

Somebody has to have solved this problem?  

Thanks.

-- 
David Carmean						Network Appliance, Inc
Infosystems Architect,					495 E. Java Drive
Java (Sunnyvale) Engineering Lab Services		Sunnyvale, CA  94089