(sorry, Dean, that you're getting a duplicate email; forgot to hit
reply-all)
Well. the vast majority of plugins are gmond plugins, and gmond don't store
anything persistently. They just provide metrics. New gmetad plugins might
do something different, but AFAIK, very few of these are in production.
In general, gmetad just puts the value it got from gmond (and all its
plugins), into the RRDtool database. These are often/nearly always 15s
averages themselves.
In order to stay fixed-size, RRDtool then averages it (by default) to
construct your historical record. So if you're taking the defaults, for
example, your every-15s samples only last for about an hour, then are
averaged up into a 5m sample.
Your "RRA" parameters in gmetad tell RRDtool what kinds of manipulations to
do on what time windows as it consolidates historical data. When you need
higher-resolution history, you'll take a lot more space for your RRD files.
OTOH, I've found that for a lot of historical stuff, even the day-level
resolution that's the default for old Ganglias is still very handy, and you
can still get a lot of value from those custom charts. They'll get better
as the history fills in (well, rather suddenly; RRD uses the best resolution
it has for the whole time range, so it only gets better when you have finer
resolution for the whole period.)
-- ReC
On Tue, Apr 26, 2011 at 11:12 AM, Hiller, Dean (Contractor) <
dean.hil...@broadridge.com> wrote:
> I was wondering if most plugins just store the raw data in the rrdb, or if
> they calculate what is to be displayed in the graph first??? Anyone have
> any idea? I am hoping it is the raw data so I can go back and manipulate
> data at some point in the past and create a new graph rather than storing
> the data to just display the graph itself. (ie. Particularly if it is a
> percentage or something). This way, I can just use rrdtool to generate me
> some new graphs based on old data between two dates.
>
>
>
> Thanks,
>
> Dean
>
>
>
>
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