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From: Greg Smith <greg@2ndQuadrant.com>
To: pgsql-performance@postgresql.org
Subject: Re: Raid 5 vs Raid 10 Benchmarks Using bonnie++
Date: Wed, 17 Aug 2011 21:08:08 -0400
Message-ID: <4E4C65F8.2000907@2ndQuadrant.com> (raw)
In-Reply-To: <009f01cc5d3e$bc3bc150$34b343f0$@com>
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	<f4e06a7cad34ee9217a3e57fd4eb0e67.squirrel@sq.gransy.com>
	<D89151D3-D2E5-47E3-8B90-4A573DAB5FFA@darkstatic.com>
	<75A85649-2B95-43D5-8404-4776D2E580EC@darkstatic.com>
	<4E4C2FEB.5060301@2ndQuadrant.com>
	<009f01cc5d3e$bc3bc150$34b343f0$@com>

On 08/17/2011 08:35 PM, mark wrote:
> With XFS the mount option is nobarrier. With ext4 I think it is barrier=0

http://www.mjmwired.net/kernel/Documentation/filesystems/ext4.txt

ext4 supports both; "nobarrier" and "barrier=0" mean the same thing.  I 
tend to use "nobarrier" just because I'm used to that name on XFS systems.

-- 
Greg Smith   2ndQuadrant US    greg@2ndQuadrant.com   Baltimore, MD
PostgreSQL Training, Services, and 24x7 Support  www.2ndQuadrant.us




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