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| Graphing anomally http://steveshipway.org/forum/viewtopic.php?f=2&t=548 |
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| Author: | RicoX9 [ Sat Mar 19, 2005 11:12 am ] |
| Post subject: | Graphing anomally |
Had some network problems today, spanning-tree went a bit bonkers and induced a loop. I ended up with a 700mbit/s storm on my backbone links. When I go to look at the graphs, it shows 70 mbit/s. Here's the number straight from the interface: 717691000 The thing is that under normal traffic, like now, it is graphing correctly. The graph shows right at 7 mbit/s right now and the counter is 7062000. It looks like when I go over 100 mbit/s, it drops the least significant digit. Am I missing something obvious in my configs? I've done MRTG since 1997, and am pretty familiar with the config options. Initially I considered adding a Factor = 10, but that would screw up the graphs, as they're fine at my normal workday speeds. Thanks, Richard |
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| Author: | stevesh [ Sat Mar 19, 2005 3:55 pm ] |
| Post subject: | |
This is a known problem in MRTG. If your traffic exceeds 100Mb/s, you should be using 64-bit counters rather than the default 32-bit counters, else you get wrap occurring. Also, I think older versions of MRTG/perl resulted in a fixed length interger field, dropping off the first digit. This may be what's happenning here? Steve |
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| Author: | RicoX9 [ Tue Mar 22, 2005 3:51 am ] |
| Post subject: | 64 bit counters |
I'll have to look at setting the counters higher. Actually, it appears to be dropping the least significant digit, as the results would be right if they were multiplied by a factor of 10. |
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