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Re: Software vs Hardware RAID 10?



On Thursday, 30.08.2007 at 10:37 +0200, Goswin von Brederlow wrote:

> > [RAID 6]
>
> If you write a single block then you have to read the 2 parity blocks
> for the stripe, update them and write 3 blocks. So you have 5 times
> the traffic on the bus. For anything doing single block writes this is
> quite the killer. I would imagine a database like oracle to just die
> with software raid6.

*nods* I believe most database 'vendors' recommend RAID-10, and
specifically to avoid any of the parity-based RAIDs, such as RAID-5 and
RAID-6.  Presumably for exactly the reasons you've outlined.  For
example, see http://edoceo.com/liber/db-postgresql-performance.php

Dave.
-- 
Dave Ewart
davee@ceu.ox.ac.uk
Computing Manager, Cancer Epidemiology Unit
Cancer Research UK / Oxford University
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