From: Jeff Younker <Jeff@mdli.com>
From: Bert Driehuis <driehuis@playbeing.org>
When an SNMP agent restarts, this will show up as a
spike on the Cricket graphs because of the way RRDTOOL
handles SNMP counter values. Of course, they can be
suppressed by defining a maximum value for the
datasource, but doing that sort of sucks because you
need a very precise understanding of the ranges that
your data can take (which, in particular for things like
monitoring a Squid cache, if often information you don't
have at the outset).
It's also useful to know that versions of RRDTool below 1.0.10 have a bug
which can generate spurious spikes. This bug is only present on certain
architectures, but if you're getting spikes at random points not related to
variable roll over then upgrade RRDTool to 1.0.10.
- Jeff Younker - jeff@mdli.com - These are my opinions, not MDL's -
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