[mrtg] bandwidth question

Taylor Lewick Taylor.Lewick at us.fortis.com
Wed May 14 22:22:57 MEST 2003

Okay, here is my situation.
I recently configured a Gigabit interface card on one of our tape media servers.

I then told the other servers to backup to this server.

I then tested some backups. I watched for over 10 minutes, with overlap on the MRTG 5 minute interval, and the lowest rate I ever saw come through to that interface was 125 Mbits per second, and the highest was 267 Mbits per second.  Great it works!  I verifed these results by using the SolarWinds Bandwidth monitor tool, as well as with GlancePlus (measurement software for HP-UX), so I feel pretty good about two different tools seeing the same results.

When I checked the MRTG graph, it showed 104 Mbits per second during that period.  
I verified that the MaxSpeed for this link shows 1000.0 Mbits/sec

Then to really load it, I opened up ftp jobs from 6 different servers to that interface and transferred some huge data files.  I saw the bandwidth go to over 300 Mbps per second for well over 10 minutes.

Yet when I checked the MRTG graph, it only showed 111 Mbits/sec during the ftp test, and 104 Mbits/sec during the backup test.
Any ideas as to why it isn't displaying what I think it should, specifically higher values?  It is a 5 minute average right?  Both times I made sure the tests lasted at least 10 minutes to cover at least one 5 minute window of high bandwidth.


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