[rrd-developers] re fetching most recent DS values
rader at ginseng.hep.wisc.edu
Tue May 22 20:56:26 MEST 2001
If you update an RRD, let the next CDP time pass and then do
"rrdtool fetch some.rrd -s now" before the next update, you get
"NaN". So "rrdtool fetch ... -s now" doesn't always report
the most "recent" DS values... for example...
11:01 update causes DS to have the value 3 at 11:00
11:02 "rrdtool fetch -s now" returns 3 for 11:00
11:06 "rrdtool fetch -s now" returns NaN for 11:05
11:07 update causes DS to have the value 6 11:05
I've hacked "dsreport -now" to report values from the second
to the most current CDP when the last update is less than the
most current CDP time.
But I'm left wondering: can anyone think of a non-kludgy
I'd rather not have to duplicate this kludge in various
contexts, so I think there should be a native way to get
recent values from RRDtool... something like...
rrdtool recent-values some.rrd AVERAGE
I'd do the work myself but last time I tried to add a new
flavor of rrdtool command, trying to get the perl bindings
working without documentation left me dazed and confused!
If anyone understands perl-shared/* and is willing to help me
get over a hump or two, please contact me off list. Thanks.
Also, if anyone knows of a reference with details etc about
the C/perl bindings interface, please let me know.
- - -
systems & network guy
high energy physics
university of wisconsin
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