From owner-freebsd-fs@FreeBSD.ORG  Tue Dec 13 18:17:11 2011
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Date: Tue, 13 Dec 2011 10:17:10 -0800
From: Jeremy Chadwick <freebsd@jdc.parodius.com>
To: siur <siur.vvm@gmail.com>
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Cc: freebsd-fs@freebsd.org
Subject: Re: epic UFS crash
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On Tue, Dec 13, 2011 at 05:54:26PM +0400, siur wrote:
> > Just curious, what type of RAID controller was this?
> 
> Oh, I don't remember. Some built-in intel controller.

Intel MatrixRAID hasn't worked well on FreeBSD for quite some time.
See Operating System Support, note the bugs:
http://en.wikipedia.org/wiki/Intel_Rapid_Storage_Technology

Be aware there is, in RELENG_8 and newer, better support for this using
the graid(8) utility.  I have been meaning to test this for months now,
but haven't had the time.

You'd probably be better off scrapping use of the built-in Intel stuff
and going with gmirror(8).

-- 
| Jeremy Chadwick                                jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                   Mountain View, CA, US |
| Making life hard for others since 1977.               PGP 4BD6C0CB |