Hi to all, i'm tryng to create a simple graph with rrd. I already read some tutorials but i need some help. I'm using varnish and i want to get a stat for minute about cache hit and misses.
The rrd was created like that: rrdtool create varnishtest.rrd --start now --step 60 DS:varnish_hits:COUNTER:120:0:U DS:varnish_misses:COUNTER:120:0:U RRA:AVERAGE:0.5:1:1440 Hits and misses are values that grow or remain the same every minute: ex from the beginning: N:hits:misses N:0:0 N:0:0 N:1:1 1 hit 1 miss N:1:1 N:22:9 22 hit 9 miss N:22:22 N:22:22 With rrdtool fetch varnishtest.rrd AVERAGE i have this values: 1375347420: -nan -nan 1375347480: -nan -nan 1375347540: -nan -nan 1375347600: 0.0000000000e+00 0.0000000000e+00 1375347660: 1.6285472960e-02 1.6285472960e-02 1375347720: 3.8119370619e-04 3.8119370619e-04 1375347780: 3.4174780290e-01 1.3018963920e-01 1375347840: 8.2521970953e-03 2.1462575314e-01 1375347900: 0.0000000000e+00 5.1846076597e-03 1375347960: 0.0000000000e+00 0.0000000000e+00 1375348020: 0.0000000000e+00 0.0000000000e+00 rrdtool graph varnishtest.png --start=-40m --imgformat=PNG --title='Varnish' --vertical-label='requests/s' DEF:b="varnishtest.rrd":varnish_hits:AVERAGE LINE1:b#06F33E:Hits DEF:c="varnishtest.rrd":varnish_misses:AVERAGE LINE1:c#F30000:Misses In the graph attached i have strange spikes , 200 ? 300 ??? What i'm doing wrong ? thanks for the support Marco
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