|
North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: PSINet/Cogent Latency
----- Original Message ----- From: "Phil Rosenthal" <[email protected]> Subject: RE: PSINet/Cogent Latency > Call me crazy -- but what's wrong with setting up RRDtool with a > heartbeat time of 30 seconds, and putting in cron: > * * * * * rrdscript.sh ; sleep 30s ; rrdscript.sh > > Wouldn't work just as well? > > I haven't tried it -- so perhaps this is too taxing (probably you would > only run this on a few interfaces anyway)... Redback's implementation overcame the limitation of monitoring say, 20,000 user circuits. You don't want to poll 20,000 interfaces for maybe 4 counters each, every 5 minutes. I think the problem with using rrdtool for billing purposes as described is that data can (and does) get lost. If your poller is a few cycles late, the burstable bandwidth measured goes up when the poller catches up to the interface counters. More bursting is bad for %ile (or good if you're selling it), and the customer won't like the fact that they're getting charged for artifically high measurements. Bulkstats lets the measurement happen independant of the reporting. --Doug
|