Re: Recomendations on raid controllers raid 1+0 - Mailing list pgsql-performance

From Scott Marlowe
Subject Re: Recomendations on raid controllers raid 1+0
Date
Msg-id dcc563d10803132253i386118a8ma6d85655d495f626@mail.gmail.com
Whole thread Raw
In response to Re: Recomendations on raid controllers raid 1+0  (Leigh Dyer <leigh@eclinic.com.au>)
List pgsql-performance
On Thu, Mar 13, 2008 at 5:14 PM, Leigh Dyer <leigh@eclinic.com.au> wrote:
> Glyn Astill wrote:
>  > Bonie++ benchmarks below.
>  >
>  > I believe the the Perc 5/i Raid 10 mode is actually a span of mirrors, rather than the expected stripe of mirrors
weshould expect from 1+0, and that this is the reason for the shitty performance. 
>  >
>
>  Could you build three RAID-1 mirrors on the device, and then stripe that
>  using software RAID-0?

That can be a useful option.  You'd have to test it on your setup, but
RAID-0 is dead simple, so letting the kernel handle the RAID-0 part is
pretty low cost.  Especially if you've got lots of CPU power, like
many of today's servers.

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