From: Luke Lonergan <llonergan@greenplum.com>
To: Steinar H. Gunderson <sgunderson@bigfoot.com>
To: Craig James <craig_james@emolecules.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Autodetect of software RAID1+0 fails
Date: Fri, 01 Jun 2007 22:41:07 -0700
Message-ID: <C2865103.322BB%llonergan@greenplum.com> (raw)
In-Reply-To: <20070601213501.GA23940@uio.no>
Steinar,
On 6/1/07 2:35 PM, "Steinar H. Gunderson" <sgunderson@bigfoot.com> wrote:
> Either do your md discovery in userspace via mdadm (your distribution can
> probably help you with this), or simply use the raid10 module instead of
> building raid1+0 yourself.
I found md raid10 to be *very* slow compared to raid1+0 on Linux 2.6.9 ->
2.6.18. Very slow in this case is < 400 MB/s compared to 1,800 MB/s.
- Luke
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To: pgsql-performance@postgresql.org
Cc: llonergan@greenplum.com, sgunderson@bigfoot.com, craig_james@emolecules.com
Subject: Re: Autodetect of software RAID1+0 fails
In-Reply-To: <C2865103.322BB%llonergan@greenplum.com>
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