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



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. ;)

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