[rrd-developers] rrd file access code
tobi at oetiker.ch
Mon Oct 13 20:44:22 CEST 2008
Today Daniel.Pocock at barclayscapital.com wrote:
> To maximise the benefit of the striping algorithm, there is some
> additional code (which I'm yet to complete) which ensures that a newly
> created RRD will have it's first CDPs stored at the same offset within
> the RRD as the other stripes. I'll try to generalise this concept to
> work within your new framework. Do you see any problem with bumping the
> offset of a new RRD file in this way?
no sure what you mean by this ? you want to synchronize the RRA
pointers ? this is certanly possible. At the moment they actually
get randomized, so that not all RRDs flip to the next diskblock at
the same time ... :-) this reduces disk impact since whenever a new
block gets touched it has to be read into cache first ...
> The algorithm is aimed at products like Ganglia, where all the RRDs are
> the same size and updated at the same time.
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Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
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