linux-kernel - Re: XFS internal error (memory corruption)

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Date:	Wed, 6 Jul 2011 04:05:05 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	T?r?k Edwin <edwintorok@...il.com>, xfs-masters@....sgi.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	xfs@....sgi.com
Subject: Re: XFS internal error (memory corruption)

On Wed, Jul 06, 2011 at 05:22:21PM +1000, Dave Chinner wrote:
> Unless you have a good sized chunk of BBWC in front of your disks,
> in which case internal logs are just as fast. In fact, internal logs
> can are often faster in this case because an internal log on a 12
> disk RAID6 array can sink a whole log more bandwidth than an external
> log on a 2-disk RAID0 mirror.....
> 
> At least, that's what my hardware tells me. ;)

Sure, a nice BBWC setup will give you good results.  But it's generally
much more expensive than a simple setup with a raid5 or 6 and a mirror for
the log device.

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