Graph went blank

[sirahza]

One of my graph went blank, it used to have full traffic

when i check rrd file

rrdtool fetch 911.rrd AVERAGE

1538457300: 8.8206352300e+06 -nan
1538457360: -nan -nan
1538457420: -nan -nan
1538457480: -nan -nan
1538457540: -nan -nan
1538457600: -nan -nan
1538457660: -nan -nan
1538457720: -nan -nan
1538457780: -nan -nan
1538457840: -nan -nan
1538457900: -nan -nan
1538457960: -nan -nan
1538458020: -nan -nan
1538458080: -nan -nan

and the rest of the file is

-nan -nan

and
rrdtool info 911.rrd


filename = "/usr/cacti/rra/911.rrd"
rrd_version = "0003"
step = 60
last_update = 1538482454
ds[traffic_in].type = "COUNTER"
ds[traffic_in].minimal_heartbeat = 1000
ds[traffic_in].min = 0.0000000000e+00
ds[traffic_in].max = 1.0000000000e+07
ds[traffic_in].last_ds = "68864251599136"
ds[traffic_in].value = NaN
ds[traffic_in].unknown_sec = 14
ds[traffic_out].type = "COUNTER"
ds[traffic_out].minimal_heartbeat = 1000
ds[traffic_out].min = 0.0000000000e+00
ds[traffic_out].max = 1.0000000000e+07
ds[traffic_out].last_ds = "249619026761109"
ds[traffic_out].value = NaN
ds[traffic_out].unknown_sec = 14
rra[0].cf = "AVERAGE"
rra[0].rows = 10080
rra[0].cur_row = 6023
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 = "AVERAGE"
rra[1].rows = 25920
rra[1].cur_row = 18983
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 = 2250
rra[2].cur_row = 1150
rra[2].pdp_per_row = 24
rra[2].xff = 5.0000000000e-01
rra[2].cdp_prep[0].value = NaN
rra[2].cdp_prep[0].unknown_datapoints = 14
rra[2].cdp_prep[1].value = NaN
rra[2].cdp_prep[1].unknown_datapoints = 14
rra[3].cf = "AVERAGE"
rra[3].rows = 9000
rra[3].cur_row = 4603
rra[3].pdp_per_row = 6
rra[3].xff = 5.0000000000e-01
rra[3].cdp_prep[0].value = NaN
rra[3].cdp_prep[0].unknown_datapoints = 2
rra[3].cdp_prep[1].value = NaN
rra[3].cdp_prep[1].unknown_datapoints = 2
rra[4].cf = "AVERAGE"
rra[4].rows = 797
rra[4].cur_row = 1
rra[4].pdp_per_row = 288
rra[4].xff = 5.0000000000e-01
rra[4].cdp_prep[0].value = NaN
rra[4].cdp_prep[0].unknown_datapoints = 158
rra[4].cdp_prep[1].value = NaN
rra[4].cdp_prep[1].unknown_datapoints = 158
rra[5].cf = "MIN"
rra[5].rows = 10080
rra[5].cur_row = 6023
rra[5].pdp_per_row = 1
rra[5].xff = 5.0000000000e-01
rra[5].cdp_prep[0].value = NaN
rra[5].cdp_prep[0].unknown_datapoints = 0
rra[5].cdp_prep[1].value = NaN
rra[5].cdp_prep[1].unknown_datapoints = 0
rra[6].cf = "MIN"
rra[6].rows = 25920
rra[6].cur_row = 18983
rra[6].pdp_per_row = 1
rra[6].xff = 5.0000000000e-01
rra[6].cdp_prep[0].value = NaN
rra[6].cdp_prep[0].unknown_datapoints = 0
rra[6].cdp_prep[1].value = NaN
rra[6].cdp_prep[1].unknown_datapoints = 0
rra[7].cf = "MIN"
rra[7].rows = 9000
rra[7].cur_row = 4603
rra[7].pdp_per_row = 6
rra[7].xff = 5.0000000000e-01
rra[7].cdp_prep[0].value = NaN
rra[7].cdp_prep[0].unknown_datapoints = 2
rra[7].cdp_prep[1].value = NaN
rra[7].cdp_prep[1].unknown_datapoints = 2
rra[8].cf = "MIN"
rra[8].rows = 2250
rra[8].cur_row = 1150
rra[8].pdp_per_row = 24
rra[8].xff = 5.0000000000e-01
rra[8].cdp_prep[0].value = NaN
rra[8].cdp_prep[0].unknown_datapoints = 14
rra[8].cdp_prep[1].value = NaN
rra[8].cdp_prep[1].unknown_datapoints = 14
rra[9].cf = "MIN"
rra[9].rows = 797
rra[9].cur_row = 1
rra[9].pdp_per_row = 288
rra[9].xff = 5.0000000000e-01
rra[9].cdp_prep[0].value = NaN
rra[9].cdp_prep[0].unknown_datapoints = 158
rra[9].cdp_prep[1].value = NaN
rra[9].cdp_prep[1].unknown_datapoints = 158
rra[10].cf = "MAX"
rra[10].rows = 10080
rra[10].cur_row = 6023
rra[10].pdp_per_row = 1
rra[10].xff = 5.0000000000e-01
rra[10].cdp_prep[0].value = NaN
rra[10].cdp_prep[0].unknown_datapoints = 0
rra[10].cdp_prep[1].value = NaN
rra[10].cdp_prep[1].unknown_datapoints = 0
rra[11].cf = "MAX"
rra[11].rows = 25920
rra[11].cur_row = 18983
rra[11].pdp_per_row = 1
rra[11].xff = 5.0000000000e-01
rra[11].cdp_prep[0].value = NaN
rra[11].cdp_prep[0].unknown_datapoints = 0
rra[11].cdp_prep[1].value = NaN
rra[11].cdp_prep[1].unknown_datapoints = 0
rra[12].cf = "MAX"
rra[12].rows = 9000
rra[12].cur_row = 4603
rra[12].pdp_per_row = 6
rra[12].xff = 5.0000000000e-01
rra[12].cdp_prep[0].value = NaN
rra[12].cdp_prep[0].unknown_datapoints = 2
rra[12].cdp_prep[1].value = NaN
rra[12].cdp_prep[1].unknown_datapoints = 2
rra[13].cf = "MAX"
rra[13].rows = 2250
rra[13].cur_row = 1150
rra[13].pdp_per_row = 24
rra[13].xff = 5.0000000000e-01
rra[13].cdp_prep[0].value = NaN
rra[13].cdp_prep[0].unknown_datapoints = 14
rra[13].cdp_prep[1].value = NaN
rra[13].cdp_prep[1].unknown_datapoints = 14
rra[14].cf = "MAX"
rra[14].rows = 797
rra[14].cur_row = 1
rra[14].pdp_per_row = 288
rra[14].xff = 5.0000000000e-01
rra[14].cdp_prep[0].value = NaN
rra[14].cdp_prep[0].unknown_datapoints = 158
rra[14].cdp_prep[1].value = NaN
rra[14].cdp_prep[1].unknown_datapoints = 158
rra[15].cf = "LAST"
rra[15].rows = 10080
rra[15].cur_row = 6023
rra[15].pdp_per_row = 1
rra[15].xff = 5.0000000000e-01
rra[15].cdp_prep[0].value = NaN
rra[15].cdp_prep[0].unknown_datapoints = 0
rra[15].cdp_prep[1].value = NaN
rra[15].cdp_prep[1].unknown_datapoints = 0
rra[16].cf = "LAST"
rra[16].rows = 25920
rra[16].cur_row = 18983
rra[16].pdp_per_row = 1
rra[16].xff = 5.0000000000e-01
rra[16].cdp_prep[0].value = NaN
rra[16].cdp_prep[0].unknown_datapoints = 0
rra[16].cdp_prep[1].value = NaN
rra[16].cdp_prep[1].unknown_datapoints = 0
rra[17].cf = "LAST"
rra[17].rows = 9000
rra[17].cur_row = 4603
rra[17].pdp_per_row = 6
rra[17].xff = 5.0000000000e-01
rra[17].cdp_prep[0].value = NaN
rra[17].cdp_prep[0].unknown_datapoints = 2
rra[17].cdp_prep[1].value = NaN
rra[17].cdp_prep[1].unknown_datapoints = 2
rra[18].cf = "LAST"
rra[18].rows = 2250
rra[18].cur_row = 1150
rra[18].pdp_per_row = 24
rra[18].xff = 5.0000000000e-01
rra[18].cdp_prep[0].value = NaN
rra[18].cdp_prep[0].unknown_datapoints = 14
rra[18].cdp_prep[1].value = NaN
rra[18].cdp_prep[1].unknown_datapoints = 14
rra[19].cf = "LAST"
rra[19].rows = 797
rra[19].cur_row = 1
rra[19].pdp_per_row = 288
rra[19].xff = 5.0000000000e-01
rra[19].cdp_prep[0].value = NaN
rra[19].cdp_prep[0].unknown_datapoints = 158
rra[19].cdp_prep[1].value = NaN
rra[19].cdp_prep[1].unknown_datapoints = 158

How Can I fix this?

[netniV]

is the device actually responding and giving the information required?

[sirahza]

Actually yes
In that device (Cisco ) we have 20 Graphs for different ports
All af the Graphs is fine except this one