[Bug 209096] zfsroot bricked on 10.3-RELEASE

[Bruce Evans]

On Wed, 3 Aug 2016 a bug that doesn't want replies at freebsd.org wrote:

> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209096
>
> --- Comment #35 from Andriy Gapon <avg at FreeBSD.org> ---
> (In reply to Daniel Ylitalo from comment #33)
> Hmm, so it seems that lsdev -v does not report the disk size as I've expected.
> So it's not that useful :-(
>
> BTW, it seems that you are still using a single huge partition for ZFS...
> If you split it into the under 2TB and above 2TB partitions, then you could
> easily test the theory by making the >2TB partition a root ZFS pool and
> checking if you can boot to it.

Old BIOSes break at 128GB.  Of course, you shouldn't use zfs on systems
with such a small limit.

I have a 10 year old laptop, which is not very old for me.  Changing its
disk from 100 GB to 750 GB worked well except when I tried to move
partitions above the 128GB boundary on it.  This was confusing, although
I have a lot of experience keeping partitions below 8GB so that they were
bootable with the 1989 boot0 that I used to use, and had rewritten this
boot0 to remove its limit, and was switching systems to use it.

Bruce