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.
Thanks,
Taylor
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