[rrd-users] dump/fetch do not show lastupdate value

[Konstantin]

nobody can help ?


On Tue, Nov 5, 2013 at 12:44 PM, Konstantin <rrd-users at delphir.com> wrote:

> I have noticed that rrdtool dump/fetch commands sometimes populate values
> as NaN even if I have written updates several times to rrd (with different
> timestamps).
>
> "lastupdate" command shows that value was successfully written, but whats
> preventing it from being displayed?
>
> Please note, that I put single values into rrd few times a day, but the
> resolution is 600 seconds. So most of the values will be NaN, but why I get
> NaN for periods with updated values?
>
> here is the output:
> # rrdtool lastupdate testrrd.rrd
> 1383560879: 800.1103515625
>
> # rrdtool fetch testrrd.rrd AVERAGE --start 1383559800 --end 1383565200
> 1383560400: -nan
> 1383561000: -nan
> 1383561600: -nan
> 1383562200: -nan
> 1383562800: -nan
> 1383563400: -nan
> 1383564000: -nan
> 1383564600: -nan
> 1383565200: -nan
> 1383565800: -nan
>
> # rrdtool info testrrd.rrd
> filename = "testrrd.rrd"
> rrd_version = "0003"
> step = 600
> last_update = 1383560879
> header_size = 792
> ds[testrrd].index = 0
> ds[testrrd].type = "GAUGE"
> ds[testrrd].minimal_heartbeat = 86400
> ds[testrrd].min = NaN
> ds[testrrd].max = NaN
> ds[testrrd].last_ds = "800.1103515625"
> ds[testrrd].value = 1.0164953906e+05
> ds[testrrd].unknown_sec = 0
> rra[0].cf = "AVERAGE"
> rra[0].rows = 1095
> rra[0].cur_row = 1009
> rra[0].pdp_per_row = 144
> rra[0].xff = 5.0000000000e-01
> rra[0].cdp_prep[0].value = 4.6826486719e+04
> rra[0].cdp_prep[0].unknown_datapoints = 0
> rra[1].cf = "AVERAGE"
> rra[1].rows = 1152
> rra[1].cur_row = 1014
> rra[1].pdp_per_row = 1
> rra[1].xff = 5.0000000000e-01
> rra[1].cdp_prep[0].value = NaN
> rra[1].cdp_prep[0].unknown_datapoints = 0
>
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