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Re: [Linux-cluster] GFS2 performance on large files



Dnia 2009-04-23, czw o godzinie 15:09 +0200, Christopher Smith pisze:
> Gordan Bobic wrote:
> 
> > To pick the optimum RAID block size, look at the disks. What is the
> > multi-sector transfer size they can handle? I have not seen any disks
> > to date that have this figure at anything other than 16, and
> > 16sectors * 512 bytes/sector = 8KB.
> > 
> > So set the RAID block size to 8KB.
> 
> Is this "chunk size" ?  Or would chunk size be #disks*8KB ?
> 
> > This is also why quite frequently a cheap box made of COTS components
> > can complete blow away a similar enterprise grade box with 10-100x
> > the price tag.
> 
> In fairness, those enterprise boxes typically have dual redundant 
> controllers with mirrored cache, and other failure-resistant goodies you 
> can't really do with COTS hardware. ;)

I don't want to stir the hornet's nest but just look at that:
http://linux.yyz.us/why-software-raid.html

There is no clear winner in that bet, but knowing pros and cons of both
approaches helps choose the best.

peace
-- 
Piotr Baranowski
Open Source Education Center www.osec.pl

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