[mrtg] Re: Massive peaks on counter resets

Scott_Rochford at DELL.com Scott_Rochford at DELL.com
Thu Feb 23 18:45:13 MET 2006

Many thanks Jan, 

I changed Maxbytes to 100000 and manually removed the values higher than
that from the log file, now the charts look correct again.

I would still be curious to know whether this is a bug or simply my
misunderstanding of how it works.  If it is a bug are there plans to fix
it?  Surely a sudden drop in a counter should result in a large negative
value (which I would expect to be discarded) rather than a large



-----Original Message-----
From: Koelstra, J. (Jan) [mailto:JKoelstra at MINSZW.NL] 
Sent: 20 February 2006 11:27
To: Rochford, Scott; mrtg at list.ee.ethz.ch
Subject: RE: [mrtg] Massive peaks on counter resets 


I don't know exactly what changed between these two versions. As work
around you can lower the MaxBytes value for this specific counter.
If the part of the logfile is representive for the normal traffic flow
you can set the Maxbytes to something like 3000 to avoid peaks higher
than this value and still have all the normal traffic graphed.



-----Original Message-----
From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]
On Behalf Of Scott_Rochford at DELL.com
Sent: Monday, February 20, 2006 10:50 AM
To: mrtg at list.ee.ethz.ch
Subject: [mrtg] Massive peaks on counter resets

Hi MRTG fans,

We use MRTG to monitor a variety of system performance counters
including Veritas Volume Manager stats from vxstat.  These are reset to
0 every night.

Previously using mrtg-2.9.25 this was working fine.  Since upgrading
recently to mrtg-2.13.0rc4 we have been getting massive peaks on the
charts every time the counter is reset.  What has changed between these
two versions that makes this happen?

We do NOT use rrdtool.

I have seen discussions of DERIVE versus COUNTER in the rrdtool list,
however they seemed to apply to rrdtool only.  I have also seen mention
of using 64-bit counters, however I can't see a way to turn that on for
values that are not collected using SNMP.

Here is a sample of the log file with such a peak:

1140100286 4614739 6217096
1140100286 1397 1658 1397 1658
1140099377 1105 1580 1105 1580
1140099300 1105 1580 1105 1580
1140099000 1105 1580 1105 1580
1140098700 1139 1577 1241 1580
1140098400 1241 1572 1241 1572
1140098100 1241 1572 1241 1572
1140097800 1246705 1263538 4614073 4675521
1140097500 4614073 4675521 4614073 4675521
1140097200 4614073 4675521 4614073 4675521
1140096900 3430080 3475828 4614073 4675521
1140096600 1115 1396 1115 1396
1140096300 1115 1396 1115 1396
1140096000 1246 1372 1628 1396
1140095700 1628 1305 1628 1305

Here are the settings in the MRTG config file for that parameter:

MaxBytes[_]: 999999999999
kMG[_]: k,M,G,T,P
kilo[_]: 1024
Options[_]: growright noinfo nopercent
YLegend[_]: Bytes / Sec
ShortLegend[_]: B/s
Legend1[_]: Total reads
Legend2[_]: Total writes
Legend3[_]: Peak reads
Legend4[_]: Peak writes
LegendI[_]:  reads:
LegendO[_]:  writes:
Colours[_]: SKYBLUE#0080FF, BLUE#000080, SKYBLUE#0080FF, BLUE#000080

Target[hostname_vxtotio_diskgroupname]: `/usr/bin/ssh hostname
/usr/local/bin/mrtgagent vxtot diskgroupname `
Title[hostname_vxtotio_diskgroupname]: Total I/O on Veritas Volumes in
PageTop[hostname_vxtotio_diskgroupname]: <H1>Total I/O on Veritas
Volumes in diskgroupname</H1>

Any suggestions would be greatly appreciated!

Scott Rochford

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