[rrd-users] Timestamps and last_ds values

[Steve Rogers]

Hi,

We have just started using rrdtool over the past couple of months. Currently
using rrdtool-1.0.33.

When creating a new rrd with a step of 600 (10 mins) the timestamps are
every 10 minutes, but at 10, 20, 30 etc past the hour, even though the job
that adds data into the rrd are run at 12, 22, 32 etc. Rrd updates values at
the nearest timstamp, but when doing a fetch I often see two timestamps with
NaN values. Is this normal?

rrd fetch

rrdtool fetch test.rrd AVERAGE -s now-600
                      ds0           ds1

1004964000: 1.1365000000e+01 2.0486666667e+01
1004964600: 1.1876666667e+01 2.3506666667e+01
1004965200: NaN NaN

rrdtool fetch test.rrd AVERAGE -s now-600
                      ds0           ds1

1004964600: 1.1876666667e+01 2.3506666667e+01
1004965200: NaN NaN
1004965800: NaN NaN

The only explaination of this is that I'm doing a fetch before the actual
update has occured, but because data is collected after the timestamp, there
are two timestamps with NaN values reported by fetch??

Also, when using GAUGE as the ds type, last_ds always contains UNKN. Is this
correct?

Thanks in advance,
Steve

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Steve Rogers                         e: steve.rogers at icl.net
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~




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