[rrd-users] rrd info fields, averages, maxes, rrdgraph

[Andres Kroonmaa]

 Hi good people,

 Can anyone explain to me, why "rrdtool info" shows that 24h average
 for given rra is _higher_ than max for same 24h? This seems typical,
 but how comes? This looks suspicious.

 Second, I understand, that below, rra[4] and rra[5] respectively hold
 ds averages and maxes for last 24h. I let rrd graph calculate same
 average/max for last 24h, and I get different results. Why?

 Also, what does rrd headers ds[dsN].value stand for? I thought they
 stand for CF:last (rate from last sample), yet with graph I get again
 different results. I don't get it.

#rrdtool info fastethernet0_1.rrd
filename = "fastethernet0_1.rrd"
rrd_version = "0001"
step = 300
last_update = 981573630
ds[ds0].type = "DERIVE"
ds[ds0].minimal_heartbeat = 1800
ds[ds0].min = 0.0000000000e+00
ds[ds0].max = NaN
ds[ds0].last_ds = "1902887567"
ds[ds0].value = 1.4077733077e+07
ds[ds0].unknown_sec = 0
ds[ds1].type = "DERIVE"
ds[ds1].minimal_heartbeat = 1800
ds[ds1].min = 0.0000000000e+00
ds[ds1].max = NaN
ds[ds1].last_ds = "3766923824"
ds[ds1].value = 1.8974612308e+07
ds[ds1].unknown_sec = 0
rra[0].cf = "AVERAGE"
rra[0].rows = 600
rra[0].pdp_per_row = 1
rra[0].xff = 0.0000000000e+00
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 = 600
rra[1].pdp_per_row = 6
rra[1].xff = 0.0000000000e+00
rra[1].cdp_prep[0].value = 1.8478077248e+06
rra[1].cdp_prep[0].unknown_datapoints = 0
rra[1].cdp_prep[1].value = 2.5527734670e+06
rra[1].cdp_prep[1].unknown_datapoints = 0
rra[2].cf = "AVERAGE"
rra[2].rows = 600
rra[2].pdp_per_row = 24
rra[2].xff = 0.0000000000e+00
rra[2].cdp_prep[0].value = 7.4878643473e+06
rra[2].cdp_prep[0].unknown_datapoints = 0
rra[2].cdp_prep[1].value = 1.0403525907e+07
rra[2].cdp_prep[1].unknown_datapoints = 0
rra[3].cf = "MAX"
rra[3].rows = 600
rra[3].pdp_per_row = 24
rra[3].xff = 0.0000000000e+00
rra[3].cdp_prep[0].value = 5.1352932593e+05
rra[3].cdp_prep[0].unknown_datapoints = 0
rra[3].cdp_prep[1].value = 7.4711004588e+05
rra[3].cdp_prep[1].unknown_datapoints = 0
rra[4].cf = "AVERAGE"
rra[4].rows = 600
rra[4].pdp_per_row = 288
rra[4].xff = 0.0000000000e+00
rra[4].cdp_prep[0].value = 1.2289683591e+08
rra[4].cdp_prep[0].unknown_datapoints = 0
rra[4].cdp_prep[1].value = 1.8594401140e+08
rra[4].cdp_prep[1].unknown_datapoints = 0
rra[5].cf = "MAX"
rra[5].rows = 600
rra[5].pdp_per_row = 288
rra[5].xff = 0.0000000000e+00
rra[5].cdp_prep[0].value = 9.1094674129e+05
rra[5].cdp_prep[0].unknown_datapoints = 0
rra[5].cdp_prep[1].value = 1.3906511967e+06
rra[5].cdp_prep[1].unknown_datapoints = 0


rrdtool graph \
 "/dev/null"    \
 "DEF:vavg0=fastethernet0_1.rrd:ds0:AVERAGE"       \
 "DEF:vmax0=fastethernet0_1.rrd:ds0:MAX"   \
 "DEF:vavg1=fastethernet0_1.rrd:ds1:AVERAGE"       \
 "DEF:vmax1=fastethernet0_1.rrd:ds1:MAX"   \
 "CDEF:savg0=vavg0"        \
 "CDEF:smax0=vmax0"        \
 "CDEF:savg1=vavg1"        \
 "CDEF:smax1=vmax1"        \
 "PRINT:savg0:LAST:ds0 lst - %12.1lf" \
 "PRINT:savg0:AVERAGE:ds0 avg - %12.1lf"      \
 "PRINT:smax0:MAX:ds0 max - %12.1lf" \
 "PRINT:savg1:LAST:ds1 lst - %12.1lf" \
 "PRINT:savg1:AVERAGE:ds1 avg - %12.1lf"      \
 "PRINT:smax1:MAX:ds1 max - %12.1lf"   \
 "-s -1day"


0x0
ds0 lst -     473262.3
ds0 avg -     543408.9
ds0 max -    2906656.6
ds1 lst -     635394.9
ds1 avg -     752755.6
ds1 max -    1390651.2



------------------------------------
 Andres Kroonmaa <andre at online.ee>
 Delfi Online
 Tel: 6501 731, Fax: 6501 708
 Pärnu mnt. 158, Tallinn,
 11317 Estonia


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