Tobias Oetiker wrote: > Karl, > > 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. > > cheers > tobi
thanks Tobi. 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 ... - Karl > Today Karl Fischer wrote: > >> Hello, >> >> 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. >> >> Example: >> >> --step=1 >> DS:loadavg:GAUGE:10:0:U >> 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 _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
