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SubjectRe: RAID5 chunksize?
On Tue, Dec 10, 2002 at 10:23:30AM -0500, Robert L. Harris wrote:
>
>
> Ok, say I'm building a 4 disk raid5 array. Performance is going to be
> critical as this system is going to be very IO intensive. We had to go
> RAID5 though due to filesystem requirements.
>
> According to the manufacturer the disks have:
>
> 8Meg DataBuffer
> 10K RPM Rotational speed
> SCSI Ultra 160
>
> (Drive is:
> http://www.fel.fujitsu.com/home/product.asp?L=en&PID=248&INFO=fsp)
>
> What is the ideal Chunksize?

Measure.

Try 4k, 32k, 128k, and see which is best.

Please post the results to the list :)

It is important that you benchmark not with tiotest or bonnie, but with
the actual applications that need to use this server.

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