> Yesterday Un L'Unique wrote: > > > > > > > Some data sundenly gone... > > > > While searching what happend to my "lost data" I discover something strange: > > 1) it is possible to fetch NaN data prior to creation base or --start time > > eg rrdtool fetch --start 19900101 pebble_Cpu.rrd AVERAGE > > > > 2) rrdtool dump generate xml file containing very old ( 1997) NaN data. > > > > Bug or misunderstanding ? > > Well, mrtg contains a datastore of constant lenght. If you define > an RRA of 2 years length, and have a start time of "now" the > 'newest' data in the RRA will be 'now' and the 'oldest' from two > years ago ... as rrdtool does not know the data from 2 years ago it > is set to 'unknown' Well I find this surprising: why does rrdtool agreed to give me answer for something before the --start time ? Anayway, my database is 1 year lenght and I am able to fetch from 1990. I also got data from 1997 in the dump makeing it very large. ( after removing pre 2002 line, le dump shrink from 500MB to 11MB )
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