[rrd-users] How to find first valid dp in rrd - repost - where are the experts?
rrd-users at ficos.de
Tue Nov 18 15:43:41 CET 2008
Tobias Oetiker wrote:
> rrdtool does not 'know' so the best you can do is to search for it
> ... maybe (!!!) some clever CDEF/VDEF can be constructed to return
> this result via graph:PRINT or XPORT. Otherwhise you have to fetch
> the data and then analyze it in an external script ... the whole
> process will be largely disk-io-bound, hence the way you implement
> this will not have a bif effect.
At least I know now that searching for it is the only way -
this is what I have done so far but I found it to be expensive ...
> Today Karl Fischer wrote:
>> since there was no answer to my last post, I'm trying again.
>> Where are the experts?
>> Is there a good way to find the first valid (not UNKN) datapoint in rrd?
>> rrdtools first doesn't quite do what I expected.
>> Instead it gives you "rrdtools last" - rrasize.
>> RRA:AVERAGE:0.5:1:259200 # 3 days
>> RRA:AVERAGE:0.5:10:259200 # 30 days
>> RRA:AVERAGE:0.5:60:259200 # 180 days
>> RRA:AVERAGE:0.5:600:259200 # 1800 days
>> If I have created a rrd like this and I started to use it a week ago,
>> I'm looking for a way to find out when that fist value was entered
>> into the rrd. Instead of telling me the first 'valid' DP in that rrd,
>> "rrdtools first file.rrd" tells me 'now - 3 days' and
>> "rrdtools first file.rrd --rraindex 3" tells me 'now - 1800 days'
>> What I would like to get is that point in time a week ago when I
>> entered the first value.
>> any ideas?
>> many thanks
>> - Karl
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