gmirror, gpart and MBR vs GPT in the Handbook
freebsd at edvax.de
Mon Dec 2 17:46:58 UTC 2013
On Mon, 02 Dec 2013 12:35:03 -0500, Mike. wrote:
> On 12/2/2013 at 6:26 PM Polytropon wrote:
> |On Mon, 02 Dec 2013 12:13:32 -0500, Mike. wrote:
> |> My understanding is that MBR can be used with drives only up
> |> and including 2TB in size. So if I use MBR, the maximum
> |> size I could use would be 2TB. Is that correct?
> |Regarding UFS's 2 TB limitation:
> |Additionally, MBR can be troublesome on bigger hard disks
> |or stripes.
> |Today's consensus seems to be:
> |If you use ZFS, let ZFS deal with everything.
> |If you use UFS, use gpart for preparation work. Use GPT when
> |possible, MBR only in exceptions, and dedicated if and only
> |if you really _really_ know what you're doing. :-)
> Following the bsdinstall-partitioning link you cited, and then
> following a link on that page, I wind up here:
> which states:
> "...The organization of the partition table in the MBR limits
> the maximum addressable storage space of a disk to 2 TB ...."
> That (and other places) is where I got the 2TB limit of MBR into
> my head. Am I misunderstanding that statement?
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. :-)
Again, consensus seems to be: If you have big disks, use ZFS.
You use ZFS because the big disks are built into or attached
to big computers with sufficient RAM, so it won't be a problem.
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...
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