values get updated in RRD DB but doesnt reflect when doing a fetch or dump

Question

i am populating an rrd db once an hour. The value gets successfully updated in rrd db but it doesnt doesnt get updated to archives

Whenever i try to fetch data using rrdfetch it return NaN and rrddump showns dump too.

but rrdtool info shows the last update value .

steps is 2000 and rras

'RRA:MIN:0.5:1:44640'
'RRA:MAX:0.5:1:44640'
'RRA:AVERAGE:0.5:1:44640'
'RRA:LAST:0.1:1:44640'

Following is my rrdtool info output .

filename = "abc.red.prod.rrd"
rrd_version = "0003"
step = 2000
last_update = 1341392733
ds[resume_l].type = "GAUGE"
ds[resume_l].minimal_heartbeat = 2000
ds[resume_l].min = NaN
ds[resume_l].max = NaN
ds[resume_l].last_ds = "22403399"
ds[resume_l].value = 1.6471702915e+10
ds[resume_l].unknown_sec = 0
ds[suspend_l].type = "GAUGE"
ds[suspend_l].minimal_heartbeat = 2000
ds[suspend_l].min = NaN
ds[suspend_l].max = NaN
ds[suspend_l].last_ds = "23203177"
    ds[suspend_l].value = 1.7281112506e+10
    ds[suspend_l].unknown_sec = 0
    rra[0].cf = "MIN"
    rra[0].rows = 44640
    rra[0].cur_row = 31110
    rra[0].pdp_per_row = 1
    rra[0].xff = 5.0000000000e-01
    rra[0].cdp_prep[0].value = NaN
    rra[0].cdp_prep[0].unknown_datapoints = 0
    rra[0].cdp_prep[1].value = NaN
    rra[0].cdp_prep[1].unknown_datapoints = 0
    rra[1].cf = "MAX"
    rra[1].rows = 44640
    rra[1].cur_row = 32625
    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
    rra[1].cdp_prep[1].value = NaN
    rra[1].cdp_prep[1].unknown_datapoints = 0
    rra[2].cf = "AVERAGE"
    rra[2].rows = 44640
    rra[2].cur_row = 41634
    rra[2].pdp_per_row = 1
    rra[2].xff = 5.0000000000e-01
    rra[2].cdp_prep[0].value = NaN
    rra[2].cdp_prep[0].unknown_datapoints = 0
    rra[2].cdp_prep[1].value = NaN
    rra[2].cdp_prep[1].unknown_datapoints = 0
    rra[3].cf = "LAST"
    rra[3].rows = 44640
    rra[3].cur_row = 8075
    rra[3].pdp_per_row = 1
    rra[3].xff = 1.0000000000e-01
    rra[3].cdp_prep[0].value = NaN
    rra[3].cdp_prep[0].unknown_datapoints = 0
    rra[3].cdp_prep[1].value = NaN
    rra[3].cdp_prep[1].unknown_datapoints = 0

and this is the output of rrdtool dump .. only selected regions

                        <!-- 2012-07-04 01:06:40 UTC / 1341364000 --> <row><v> NaN </v><v> NaN </v></row>
                    <!-- 2012-07-04 01:40:00 UTC / 1341366000 --> <row><v> NaN </v><v> NaN </v></row>
                    <!-- 2012-07-04 02:13:20 UTC / 1341368000 --> <row><v> NaN </v><v> NaN </v></row>
                    <!-- 2012-07-04 02:46:40 UTC / 1341370000 --> <row><v> NaN </v><v> NaN </v></row>
                    <!-- 2012-07-04 03:20:00 UTC / 1341372000 --> <row><v> NaN </v><v> NaN </v></row>
                    <!-- 2012-07-04 03:53:20 UTC / 1341374000 --> <row><v> NaN </v><v> NaN </v></row>
                    <!-- 2012-07-04 04:26:40 UTC / 1341376000 --> <row><v> NaN </v><v> NaN </v></row>
                    <!-- 2012-07-04 05:00:00 UTC / 1341378000 --> <row><v> NaN </v><v> NaN </v></row>
                    <!-- 2012-07-04 05:33:20 UTC / 1341380000 --> <row><v> NaN </v><v> NaN </v></row>
                    <!-- 2012-07-04 06:06:40 UTC / 1341382000 --> <row><v> NaN </v><v> NaN </v></row>
                    <!-- 2012-07-04 06:40:00 UTC / 1341384000 --> <row><v> NaN </v><v> NaN </v></row>
                    <!-- 2012-07-04 07:13:20 UTC / 1341386000 --> <row><v> NaN </v><v> NaN </v></row>
                    <!-- 2012-07-04 07:46:40 UTC / 1341388000 --> <row><v> NaN </v><v> NaN </v></row>
                    <!-- 2012-07-04 08:20:00 UTC / 1341390000 --> <row><v> NaN </v><v> NaN </v></row>
                    <!-- 2012-07-04 08:53:20 UTC / 1341392000 --> <row><v> NaN </v><v> NaN </v></row>
            </database>
    </rra>

Answer 1

note, that rrdtool does silently ignore values violating data source restrictions set at creation time ... it will log NaN instead. Use updatev instead of update to get instant feedback on what is stored to the RRAs.