[rrd-developers] Accelerator Daemon

John P. Rouillard rouilj at cs.umb.edu
Wed Jul 2 03:19:48 CEST 2008

In message <20080701233250.GA1734 at inyotech.local>,
Scott Brumbaugh writes:
>On Mon, Jun 30, 2008 at 10:52:23AM +0200, Florian Forster wrote:
>> On Sun, Jun 29, 2008 at 02:21:10PM -0700, Scott Brumbaugh wrote:
>> > When a large number of rrd updates occur at the same time the
>> > filesystem tries to write all updates to disk file at the same time.
>> > This slows the system.  I may be missing something but it looks like
>> > that will happen with this patch if a client is both writing and
>> > reading large numbers of rrd files simultaneously.
>> Yes, that's probably right. I didn't expect anyone with such a huge
>> number of RRD files to generate graphs periodically/statically instead
>> of on demand/dynamically.. Is anyone with a big number of files doing
>> that? If so: Why?
>[...]For large
>networks visually watching graphs for anomalies don't scale well.[...]
>Rrdtool allows for automated network monitoring through the rrd_xport
>function.  [...] it is good to be able to read out the last few rate
>estimates quickly after an update.

Using the predictive capabilities of rrdtool, it is also useful to
grab the last few Holt Winters FAILURE rra's out of an rrd and then
alert on that data.

				-- rouilj
John Rouillard
My employers don't acknowledge my existence much less my opinions.

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