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Re: Debunking myths about metadata CRC overhead

To: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>
Subject: Re: Debunking myths about metadata CRC overhead
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Tue, 4 Jun 2013 12:53:07 +1000
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <20130603111011.461d10b5@xxxxxxxxxxxxxx>
References: <20130603074452.GZ29466@dastard> <20130603111011.461d10b5@xxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Mon, Jun 03, 2013 at 11:10:11AM +0200, Emmanuel Florac wrote:
> Le Mon, 3 Jun 2013 17:44:52 +1000 vous écriviez:
> > There has been some assertions made recently that metadata CRCs have
> > too much overhead to always be enabled.  So I'll run some quick
> > benchmarks to demonstrate the "too much overhead" assertions are
> > completely unfounded.
> Just a quick question: what is the minimal kernel version and xfsprogs
> version needed to run xfs with metadata CRC? I'd happily test it on
> real hardware, I have a couple of storage servers in test in the 40 to
> 108 TB range.

If the maintainers merge all the patches I send for the 3.10-rc
series, then the 3.10 release should be stable enough to use for
testing with data you don't care if you lose.

As for the userspace code - that is still just a patchset. I haven't
had any feedback from the maintainers about it in the past month, so
I've got no idea what they are doing with it. I'll post out a new
version in the next couple of days - it's 50-odd patches by now, so
it'd be nice to have it in the xfsprogs git tree so people could
just pull it and build it for testing purposes by the time that 3.10


Dave Chinner

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