[mrtg] rrdtool graph intermittent !!!

[orcganir at chinabank.ph]

my graph-display on some of my targets are intermittent. sometimes it
displays a graph sometimes it's just gray...
this is what I saw when I issued the rrdtool fetch [filename.rrd] average
command. anybody knows what it means???

                        ds0               ds1

1092027000: -1.#IND000000e+000 -1.#IND000000e+000
1092027060: -1.#IND000000e+000 -1.#IND000000e+000
1092027120: -1.#IND000000e+000 -1.#IND000000e+000
1092027180: -1.#IND000000e+000 -1.#IND000000e+000
1092027240: 2.0491803279e+000 1.7377049180e+000
1092027300: 2.0491803279e+000 1.7377049180e+000
1092027360: -1.#IND000000e+000 -1.#IND000000e+000
1092027420: -1.#IND000000e+000 -1.#IND000000e+000
1092027480: -1.#IND000000e+000 -1.#IND000000e+000
1092027540: -1.#IND000000e+000 -1.#IND000000e+000
1092027600: -1.#IND000000e+000 -1.#IND000000e+000
1092027660: -1.#IND000000e+000 -1.#IND000000e+000
1092027720: -1.#IND000000e+000 -1.#IND000000e+000
1092027780: -1.#IND000000e+000 -1.#IND000000e+000
1092027840: -1.#IND000000e+000 -1.#IND000000e+000
1092027900: -1.#IND000000e+000 -1.#IND000000e+000
1092027960: -1.#IND000000e+000 -1.#IND000000e+000
1092028020: -1.#IND000000e+000 -1.#IND000000e+000
1092028080: -1.#IND000000e+000 -1.#IND000000e+000
1092028140: 2.0491803279e+000 1.7377049180e+000
1092028200: 2.0491803279e+000 1.7377049180e+000
1092028260: -1.#IND000000e+000 -1.#IND000000e+000
1092028320: -1.#IND000000e+000 -1.#IND000000e+000
1092028380: -1.#IND000000e+000 -1.#IND000000e+000
1092028440: -1.#IND000000e+000 2.3389830508e+000
1092028500: -1.#IND000000e+000 2.3389830508e+000


Rouel

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