[mrtg-developers] Re: Blocking Outages

Alex van den Bogaerdt alex at slot.hollandcasino.nl
Thu May 24 19:49:22 MEST 2001

Brian E. Seppanen wrote:

> I currently graph 2200 targets and that number will grow.  We're using
> MRTG 2.9.11 on a DELL Poweredge 2300 Server with Dual PIII 500 and 512 MB
> of RAM.  We're running MRTG in daemon mode with the possible forks set to
> 4.

You can probably increase the number of forks.  Keep an eye on memory
usage when you do so, you probably have plenty but look anyway.

> As it is currently if one of our monitored routers goes down for any
> length of time it blocks all other graphs from graphing.  I've tried
> modifying the default SNMP session values to only doing a single retry, to
> hopefully ease the blocking.  So far I haven't noticed a benefit in terms
> of blocking and graphing outages.

Try running multiple config files in parallel (different MRTG processes).
If one is delayed, the other(s) should continue without a problem. This
will also increase memory usage.

> I have been told that we need to monitor on each router in/out
> traffic,collisions,crc's, and some signal/noise on some routers.  Perhaps
> this is trying to do to much on one router, however, I need to see if it's
> possible to set up mrtg so that it graphs seemlessly when one router goes
> down.

Maybe you could benefit from RRDtool.  Move away from MRTG as the front
end, start using one of the others as mentioned on the RRDtool home page.
Using RRDtool will improve your resource usage, the new front end will
give you more possibilities for monitoring.

 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
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