| From: | "Scott Marlowe" <scott(dot)marlowe(at)gmail(dot)com> |
|---|---|
| To: | "Leigh Dyer" <leigh(at)eclinic(dot)com(dot)au> |
| Cc: | "Glyn Astill" <glynastill(at)yahoo(dot)co(dot)uk>, "Guillaume Smet" <guillaume(dot)smet(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Recomendations on raid controllers raid 1+0 |
| Date: | 2008-03-14 05:53:41 |
| Message-ID: | dcc563d10803132253i386118a8ma6d85655d495f626@mail.gmail.com |
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| Lists: | pgsql-performance |
On Thu, Mar 13, 2008 at 5:14 PM, Leigh Dyer <leigh(at)eclinic(dot)com(dot)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 we should 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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