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Date:      Mon, 02 Dec 2013 17:23:20 -0900
From:      Peter Giessel <pgiessel@mac.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: gmirror, gpart and MBR vs GPT in the Handbook
Message-ID:  <E0439E56-EE01-4E03-891F-9694811FEF06@mac.com>
In-Reply-To: <20131202184642.d35c4548.freebsd@edvax.de>
References:  <201311301303210813.05DE187E@smtp.24cl.home> <alpine.BSF.2.00.1311301352140.99113@wonkity.com> <201312011121580096.005D00FB@smtp.24cl.home> <alpine.BSF.2.00.1312011016490.5791@wonkity.com> <201312021213320528.00673D5F@smtp.24cl.home> <20131202182623.43331984.freebsd@edvax.de> <201312021235030914.007AF1DF@smtp.24cl.home> <20131202184642.d35c4548.freebsd@edvax.de>

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On 2013, Dec 2, at 8:46, Polytropon <freebsd@edvax.de> wrote:

> I think you're correct regarding this finding: The data type 2^32
> (because of 32 bit) defines the 2 TB limit. It applies both on
> MBR (which stores 32 bit values) and UFS (which also stores 32
> bit values). However, I've never dealt with disks > 2 TB _and_
> UFS before, so I can't add specific individual findings. :-)

UFS works on drives bigger than 3 TB (ref /dev/da1p1 and =
/dev/mirror/gm0.journal):

[17:20][media: ~]> df -h
Filesystem                 Size    Used   Avail Capacity  Mounted on
/dev/da0s1a                247M    216M     11M    95%    /
devfs                      1.0k    1.0k      0B   100%    /dev
/dev/da1p1                   4T    3.6T     82G    98%    /media
/dev/da0s1e                3.9G    5.1M    3.6G     0%    /tmp
/dev/da0s1f                7.5G    5.8G    1.1G    84%    /usr
/dev/da0s1d                3.9G    733M    2.9G    20%    /var
/dev/mirror/gm0.journal    2.7T    1.8T    645G    74%    /media/mythtv
[17:20][media: ~]> more /etc/fstab
# Device                Mountpoint      FStype  Options         Dump    =
Pass#
/dev/da0s1b             none            swap    sw              0       =
0
/dev/da0s1a             /               ufs     rw              1       =
1
/dev/da1p1              /media          ufs     rw              2       =
2
/dev/da0s1e             /tmp            ufs     rw              2       =
2
/dev/da0s1f             /usr            ufs     rw              2       =
2
/dev/da0s1d             /var            ufs     rw              2       =
2
/dev/mirror/gm0.journal /media/mythtv   ufs     rw,async        2       =
2
/dev/acd0               /cdrom          cd9660  ro,noauto       0       =
0




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