On Thu, 16 Feb 2012, Jeremy Chadwick wrote:
On Fri, Feb 17, 2012 at 01:08:28AM +0100, Miroslav Lachman wrote:
Please don't mix two things together. gpart can replace fdisk and
bsdlabel, but GPT vs. MBR is a different thing. GPT doesn't play
nice with GEOM classes which store their metadata on last sector.
For example, you can't use gmirror of a whole drives and use GPT on
top of this mirror. (and gmirror is not the only one)
This is quite possibly the most concise, clearest definition of a major
(borderline catastrophic) situation pertaining to GPT + GEOM
combinations.
I'm going to be more bold than usual: who is fixing this, and when is it
going to be MFC'd to 9, 8, and probably 7 would be a good idea? If
nobody is fixing this, someone had better light a fire under someone's
ass to fix it. I'm absolutely amazed this is still a problem.
How can it be fixed? GPT only has two points of reference, the start
and end of the disk. To do more it would have to be aware of a lot of
possible disk formats.
On the other hand, GEOM stuff works inside GPT partitions. And if
that's not acceptable, MBR partitions will be around for a long time.
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