[Bug 271262] bsdinstaller in AutoZFS + MBR mode always wipes disklabel - rendering system non-bootable

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271262

Allan Jude <allanjude@FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |allanjude@FreeBSD.org

--- Comment #8 from Allan Jude <allanjude@FreeBSD.org> ---
I would concur that removing MBR support is better.

There are significant issues with updating `zfsboot` (the next stage bootstrap)
in an MBR pool, since it lives within the partition which is opened exclusively
when the system is booted. So you have to use GEOM debug flags to allow
scribbling over random offsets of the disk in order to update your bootcode.

So even if it was not broken, it is a bad idea in general.
It only really existed because of some BIOSes that couldn't boot from GPT, but
that was fixed with the "GPT + Active" and "Lenovo Fix" options.

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