On Sun, Oct 24, 1999 at 09:58:11AM -0600, Greg Lehey wrote:
>
> Indeed. It's quite easy to put all cylinder groups on a single
> spindle; I've seen reports of up to 80% degradation under these
> circumstances.
>
> > Where sequential read/write performance is not critical you can stripe at
> > cluster size to avoid this. Other wise using an odd number of spindles for
> > a stripe and an even number for a RAID3 or RAID5 or stripeing at an interval
> > which is not a power of two should work (12,24,48,76 etc)
>
> The best I've heard of is 768 kB - 1 sector. This works on Vinum, but
> it seems that most RAID controllers use a somewhat simplistic striping
> algorithm. You might like to try 31 kB or such. This won't make any
> difference with rawio, though.
>
I would agree from experiance that 768 KB seems a good selection for vinum
and probably ccd too
--
GeoffB
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