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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: PSINet/Cogent Latency
On Mon, Jul 22, 2002 at 11:42:57PM -0700, Gary E. Miller wrote: > > Yo Alexander! > > On Tue, 23 Jul 2002, Alexander Koch wrote: > > > imagine some four routers dying or not answering queries, > > you will see the poll script give you timeout after timeout > > after timeout and with some 50 to 100 routers and the > > respective interfaces you see mrtg choke badly, losing data. > > Yep. Anything gets behind and it all gets behind. > > That is why we run multiple copies of MRTG. That way polling for one set > of hosts does not have to wait for another set. If one set is timing > out the other just keeps on as usual. Parallelism is polling science 101. If your poller can't do this, it will never scale, just give up and go home. And I mean controlled parallelism, not forking out all your queries at once and letting the system sort it out (as I've seen done by people waving their redhat cds and perl tshirts). -- Richard A Steenbergen <[email protected]> http://www.e-gerbil.net/ras PGP Key ID: 0x138EA177 (67 29 D7 BC E8 18 3E DA B2 46 B3 D8 14 36 FE B6)
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