If you're running MRTG on 10 minute intervals,
isn't the "Interval: 5" setting in your config file
wrong? If the rrd file was created with Interval: 5,
and then you change the polling interval to 10, but
don't dump/recreate the rrd file, it'll still be operating
under the assumption your interval is 5 minutes, not
10 minutes.
Does your data start to look better if you run it at
five minute intervals, to match what your rrd file
is expecting?
Matt
>________________________________
> From: Simon Westlake <[email protected]>
>To:
>Cc: "[email protected]" <[email protected]>
>Sent: Wednesday, May 15, 2013 4:31 AM
>Subject: Re: [mrtg] Strange MRTG problem
>
>
>
>Thanks for the ideas. Community string is actually redacted, but I guess I
>should've made that more obvious than mashing the keyboard :)
>
>
>Agreed, my first thought was v1 but I am now specifically targetting 64bit
>counter OIDs and I've verified it is using SNMP v2 through debug options.
>Definitely sure the port is the same - low values are slightly different but
>the intervals are also slightly different (Cacti is running on 1 minute, MRTG
>is running on 10 minutes.)
>
>
>The MRTG version is super old - that was one of my first thoughts, I'm just
>somewhat reluctant to even touch it as it's running on an incredibly old
>version of Linux as well but I think that is my next plan.
>
>
>Not using a third party front end, it is a custom PHP script that calls
>'rrdtool graph' directly. I will try rearranging the config file, thanks for
>that idea.
>
>
>
>On Tue, May 14, 2013 at 10:34 PM, Steve Shipway <[email protected]>
>wrote:
>
>A few thoughts
>>
>>1. You’ve just told the world your SNMP community string. Oops.
>>2. It certainly looks a bit like an SNMPv1 issue, though that would
>>generally top off about 120Mbps. However the config seems to use v2
>>correctly.
>>3. Are you absolutely certain that both graphs relate to the same port?
>> Possibly there is some confusion in the settings?
>>4. Look at the two graphs close up. Are they exactly the same for low
>>values, then lose it for high values? If so, maybe its using SNMPv1 anyway.
>>If not, maybe you’re graphing something different.
>>5. Which version of MRTG do you have? Possibly an old one is not
>>handling things correctly. Get a copy of 2.17.x installed and see if the
>>problem goes away.
>>6. There’s always the possibility that Cacti is getting it wrong, so
>>check there as well.
>>7. Is it a bits/bytes issue? If Cacti is showing 8x the MRTG value,
>>maybe MRTG is showing in bytes. Though you have ‘options bits’.
>>8. What frontend are you using for MRTG/RRD? Some, notably
>>Routers2.cgi in earlier versions, want the Target line to come first in the
>>stanza. Try rearranging them this way, maybe the Options line is getting
>>ignored and you’re viewing in bytes/sec.
>>
>>HTH
>>
>>Steve
>>
>>
>>________________________________
>>
>>Steve Shipway
>>ITS Unix Services Design Lead
>>University of Auckland, New Zealand
>>Floor 1, 58 Symonds Street, Auckland
>>Phone: +64 (0)9 3737599 ext 86487
>>DDI: +64 (0)9 923 6487
>>Mobile: +64 (0)21 753 189
>>Email: [email protected]
>>PPlease consider the environment before printing this e-mail:
>>打印本邮件，将减少一棵树存活的机会
>>
>>From:[email protected]
>>[mailto:[email protected]] On Behalf Of
>>Simon Westlake
>>Sent: Wednesday, 15 May 2013 2:26 p.m.
>>To: [email protected]
>>Subject: [mrtg] Strange MRTG problem
>>
>>Hello,
>>
>>It's been a long time since I used MRTG (I've been writing directly to rrds
>>for a long time now) but an old employer of mine asked me to troubleshoot a
>>legacy MRTG setup and I'm having a strange problem with it I cannot decipher.
>>
>>I am graphing a port in two ways. One is in Cacti, one is with MRTG. Both are
>>using 64bit counters (I have even setup the MRTG configuration to
>>specifically use the HC OIDs rather than assuming they are being queried by
>>specifying :::::2)
>>
>>In Cacti, I get the correct value (approximately 700-800Mbps per second.) In
>>MRTG, it is never more than 190-200Mbps.
>>
>>My MRTG configuration looks like this:
>>
>>WorkDir:/var/www/mrtg
>>Forks: 30
>>Refresh: 300
>>Interval: 5
>>MaxAge: 999999999999999999999999
>>SnmpOptions: retries => 1, timeout => 1
>>LogFormat: rrdtool
>>
>>
>>Options[DAS-c3229-bandwidth]: growright,bits,nolegend,nobanner,nopercent
>>Directory[DAS-c3229-bandwidth]: DAS-c3229
>>Target[DAS-c3229-bandwidth]:
>>1.3.6.1.2.1.31.1.1.1.10.140&1.3.6.1.2.1.31.1.1.1.6.140:[email protected]:::::2
>>Extension[DAS-c3229-bandwidth]: php
>>Suppress[DAS-c3229-bandwidth]: y
>>Title[DAS-c3229-bandwidth]: Bandwidth Utilization
>>Maxbytes[DAS-c3229-bandwidth]: 200000000000000000
>>AbsMax[DAS-c3229-bandwidth]: 200000000000000000
>>
>>I have tried tweaking a lot of things and I can't seem to figure out what's
>>going on. Any insight would be appreciated as I'm 2+ days into
>>troubleshooting this thing and it's driving me crazy. Thanks!
>>--
>>- Simon Westlake
>
>
>
>--
>- Simon Westlake
>[ digitalgunfire.com ]
>AIM: ShirowDG
>ICQ: 2227213
>Voice: (414) 810-6392
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