[rrd-users] Re: Wow. Ready to thrown an e450 aat RRD :)

[Tobias Oetiker]

Yesterday you sent me mail regarding Re: [rrd-users] Re: Wow.  Ready to...:

*> > cool ... do you have any more detaild performance figures ... is your system
*> > rrd bound, data aquisition bound, disk or memmory bound ... (I found that
*> > rrd performance is significantly memmory bound because of excessive caching
*> > needs ... 
*> 
*> CPU is a bit high, but managable.  I'm grossly IO bound, even on a
*> hardware raid box with read/write caching built in.  We're going to keep
*> throwing spindles at it until we can max out the cpus.   This is all in
*> the data aquisition stage.
*> 
*> Some stats for you:
*>   1700 or so .rrd's
*>     10 datum each
*>      4 RRA's each
*> Updates are once per minute
*> 
*> On an E250, 1.5 gig ram, 6 drives in an A1000, this means
*> that I'm about 80% towards my redline of not keeping up.
*> 
*> 
*> I still need to get you images.. which I'll do privately.

great ... will they be publishable ?

note, that disk cache is only one element of the equation. It seems that the
OS keeps some sort of a file system cache which allows to reopen a file
quicker if it has already been opened recently ...

cheers
tobi

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