On 30/12/2010 10:39, Stan Hoeppner wrote:
[...]
quoted text
> Any RAID scheme that uses parity is less than optimal, and up to
> horrible, for heavy random IO loads.  As always, this depends on "how
> heavy" the load is.  For up to a few hundred constant IOPS you can get
> away with parity RAID schemes.  If you need a few thousand or many
> thousand IOPS, better stay away from parity RAID.

Sorry, I have to disagree with this, in this situation. RAID-6 over 4 
discs will be just as fast for reading multiple small files as RAID-10 
over 4 discs, and a web server is a read-mostly environment, while at 
the same time I can't imagine any RAID schema ever giving thousands of 
IOPS over 4 discs, parity or no.

Cheers,

John.

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