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Re: XFS internal error (memory corruption)

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: XFS internal error (memory corruption)
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Wed, 6 Jul 2011 04:05:05 -0400
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, T?r?k Edwin <edwintorok@xxxxxxxxx>, xfs-masters@xxxxxxxxxxx, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <20110706072221.GZ1026@dastard>
References: <4E12A927.9020102@xxxxxxxxx> <20110705130932.GF1026@dastard> <4E1313C1.6020309@xxxxxxxxx> <20110706040403.GW1026@dastard> <20110706070756.GA25800@xxxxxxxxxxxxx> <20110706072221.GZ1026@dastard>
User-agent: Mutt/1.5.21 (2010-09-15)
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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