[rrd-users] Q: How to fetch value from "start" to "end" in RRD/RRA

[Alex Lam]

Hello All,

Q1: How can I obtain the start and end value in the RRD/RRA so that
    I can dump all values in the rrd/rra during "start" to "end" time?

Q2: How can I just simply fetch from the start to the ending (or last)
    data value in rrd/rra?

I find that the value "start" and "end" cannot be used together or
reference to each other in command like
      rrdtool fetch --start --end

e.g.
Hope this can get the "start" and "end" value from the output
 > /usr/local/rrdtool-1.0.25/bin/rrdtool fetch etc6p3.rrd AVERAGE
            --start start+0s --end end-0s
ERROR: the start time cannot be specified relative to itself


Hope this can get the end value from the command output
 > /usr/local/rrdtool-1.0.25/bin/rrdtool fetch etc6p3.rrd AVERAGE
            --start end+0s --end end-0s
ERROR: the end time cannot be specified relative to itself

 > /usr/local/rrdtool-1.0.25/bin/rrdtool fetch etc6p3.rrd AVERAGE
            --start end+0s --end start-0s
ERROR: the start and end times cannot be specified relative to each other

Thanks in advance !

Best Regards,

         Alex          


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