rrdtool performance tuning (fwd)

[Brooks Davis]

On Tue, Oct 30, 2007 at 12:32:42PM +0300, Dmitry Morozovsky wrote:
> On Mon, 29 Oct 2007, Brooks Davis wrote:
> 
> BD> On Mon, Oct 29, 2007 at 11:13:09AM +0300, Dmitry Morozovsky wrote:
> BD> > 
> BD> > [hmm, after thinking a bit I decided it would be more appropriate here, in 
> BD> > stable@]
> BD> > 
> BD> > Dear colleagues,
> BD> > 
> BD> > any hints to tune rrdtool with ~30k rrd files (approx 2k target devices)?
> BD> > 
> BD> > machine is mostly IO-bound, showing 100% disk load with 8 or sometimes even 3 
> BD> > mB/s, 300-400 tps (it's 2 SATA300 disks in gmirror)
> BD> 
> BD> Store it on a memory file system and take periodic snapshots.  The format is
> BD> hopeless for large numbers of updates.  The ganglia port's startup scripts show
> BD> an example of doing this.
> 
> I thought about this, but total size of these files is already more than 
> memory, and I'm not sure md would be suitable for this.

FWIW, this is the only work around ganglia users have found.  You might
consider a solid state disk or one of the battery backed RAM cards
out there if adding more memory and switching to a 64-bit OS isn't an
option.

-- Brooks
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