From: Scott Marlowe <scott.marlowe@gmail.com>
To: Leigh Dyer <leigh@eclinic.com.au>
Cc: Glyn Astill <glynastill@yahoo.co.uk>
Cc: Guillaume Smet <guillaume.smet@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Recomendations on raid controllers raid 1+0
Date: Thu, 13 Mar 2008 23:53:41 -0600
Message-ID: <dcc563d10803132253i386118a8ma6d85655d495f626@mail.gmail.com> (raw)
In-Reply-To: <47D9B566.3050907@eclinic.com.au>
References: <992988.82686.qm@web25812.mail.ukl.yahoo.com>
<47D9B566.3050907@eclinic.com.au>
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 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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To: pgsql-performance@postgresql.org
Cc: scott.marlowe@gmail.com, leigh@eclinic.com.au, glynastill@yahoo.co.uk, guillaume.smet@gmail.com
Subject: Re: Recomendations on raid controllers raid 1+0
In-Reply-To: <dcc563d10803132253i386118a8ma6d85655d495f626@mail.gmail.com>
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