On Thu, 15 Apr 2004, Cris Carampa wrote:
> scott.marlowe wrote:
>
> > The current king of putting postgresql on multiple platters and getting
> > best overall performance is a battery backed caching raid controller run
> > one or more many disk RAID-5 arrays.
>
> I thought the best choice were RAID-10 (1+0) (when available). There
> isn't a write penalty with RAID-5?
there is for software RAID-5 or for non-battery backed cached RAID-5, but
for a battery backed controller, the penalty is basically gotten rid of by
being hidden in a lazy write. Plus the controller can "gang" writes to
individual drives to achieve a very good throughput.
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