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From: "Paul Saab" <ps@mu.org>
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Cc: freebsd-stable@freebsd.org, Emil Mikulic <emikulic@gmail.com>
Subject: Re: ciss(4) not coping with large arrays?
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On Fri, May 16, 2008 at 12:50 AM, Claus Guttesen <kometen@gmail.com> wrote:

> > Running today's RELENG_7 (although 7.0-RELEASE has the same problem),
> > GENERIC kernel on an amd64 and I can't seem to get a da(4) device for
> > any arrays bigger than 2TB.
>
> In earlier releases (5 and 6 at least) you couldn't create partitions
> larger than 2 TB. I don't know whether work has been to circumvent
> this in 7 but tools like fsck has to be changed as well. Have you
> tried zfs?


zfs has nothing to do with this.  The driver is not properly dealing with
the large volume.

set the kernel tunable in loader.conf

kern.cam.da.3.minimum_cmd_size=16
kern.cam.da.4.minimum_cmd_size=16