RRDTool is what we use to get the average out of a period of time.
We feed RRDTool with the values at every poll and then ask RRDTool for the
AVERAGE of a specific DS over a period of time (that we specify from the
rrd_grapher fucntion).
Javier
Ying Hon Liu wrote:
Dear Javier,
Thanks a lot for your reply!
I'me trying to read the source code to understand how
the AVERAGE value is calculated (shown in the bottom
of the interface traffic performance graph). Could you
plase tell us how or where can we find the definition
of the "inputbits" or "input" in traffic.inc.php. How
the "inputbits" and "outputbits" average is
calculated/defined, what is its infomation source:
"AREA:inputbits#00CC00:'Inbound '",
"GPRINT:inputbits:MAX:'Max\:%8.2lf %sbps'",
"GPRINT:inputbits:AVERAGE:'Average\:%8.2lf %sbps'",
"GPRINT:inputbits:LAST:'Last\:%8.2lf %sbps\\n'",
$opts_DEF[]="CDEF:inputbits=input,UN,input,input,IF,8,*";
$opts_DEF[]="CDEF:outputbits=output,UN,output,output,IF,8,*";
What is the value of "input" and "output"? And where
can I find the definition of rrdtool_get_def?
$opts_DEF =
rrdtool_get_def($data,array("input","output"));
To may knowledge, jffnms store every collected value
in the RRD file as shown in the following command
output capture. What function jffnms has used to
consolidate/calculate a single AVERAGE value (over a
arbitary period, e.g. a week, a month or an year)? If
you're too busy to give detail info, could you please
tell us where can we find the answer? Thansk!
debian-test1:/opt/jffnms/rrd# rrdtool info
interface-375-0.rrd
filename = "interface-375-0.rrd"
rrd_version = "0001"
step = 300
last_update = 1145615421
ds[data].type = "COUNTER"
ds[data].minimal_heartbeat = 600
ds[data].min = 0.0000000000e+00
ds[data].max = 1.8750001000e+07
ds[data].last_ds = "51923474"
ds[data].value = 1.5335526316e+01
ds[data].unknown_sec = 0
rra[0].cf = "AVERAGE"
rra[0].rows = 103680
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
Henry
===================================================
Date: Sat, 08 Apr 2006 11:55:10 -0300
From: Javier Szyszlican <[EMAIL PROTECTED]>
Organization: JFFNMS
CC: jffnms-users@lists.sourceforge.net
Subject: Re: [jffnms-users] how JFFNMS calculates the
performance
average
We use the average function in RRDTool to do that, so
is no really
ours.
But if your graph have some down time (it will count
as 0 for the
average).
Javier
Ying Hon Liu wrote:
Dear JFFNMS author or experienced users,
We would like to know how JFFNMS calculates the
average interface performance data value. To our
understanding, is it:
(total (sum of) performance data over a specific
period) / (no. of sampling).
Where can we find the formula from the JFFNMS
configuration file? Could you plase help explain how
the average is calulated over different time
duration?
We're testing the functionality and data accuracy of
JFFNMS. We've provisioned a Cisco c2924 switch port
object (or "Interface", in JFFNMS's terminology) at
about 6:00pm yesterday. For the traffic graph, we're
checking the data collected and calculated by JFFNMS
up to 11:30am today (07-Apr-06). The average values
are shown as below:
Graph 1 (all the data are colleted within a time
period) :
from : today 10:30
to : today 11:30
Inbound average : 1.32 kbps
Outbound average : 79.82 kbps
Graph 2 (with some undefined period/the time during
which the monitored object hasn't been provisoned
yet(10:30-18:00)) :
from : 2006-04-06 10:30
to : today 10:30
Inbound average : 2.89 kbps
Outbound average : 7.04 kbps
Graph 3 (with most of the time during which the
monitored object hasn't been provisoned
yet(2006-03-31
to yesterday 2006-04-06 18:00)
from : 2006-03-31 10:30 (last week)
to : today 10:30
Inbound average : 2.92 kbps (which is close to Graph
2)
Outbound average : 7.55 kbps
Graph 4 (with most of the time during which the
monitored object hasn't been provisoned
yet(2006-03-31
to yesterday 2006-04-06 18:00)
from : 2006-03-31 10:30 (last week)
to : today 10:30
Inbound average : 2.92 kbps (which is close to Graph
2)
Outbound average : 7.55 kbps
Graph 5 (with almost all of the time during which
the
monitored object hasn't been provisioned yet
(2005-04-07 to yesterday 2006-04-06 18:00)
from : 200-04-07 10:30 (last year)
to : today 10:30
Inbound average : 7.97 kbps (??? why is it larger
???)
Outbound average : 16.29 kbps (??? why is it larger
???)
Thanks in advance!
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--
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Javier Szyszlican, Project Leader, JFFNMS
[EMAIL PROTECTED]
I hope JFFNMS or I were helpful to you, if you
can, please donate at http://jffnms.org/donate
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