[Bug 209096] zfsroot bricked on 10.3-RELEASE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209096

--- Comment #31 from karl at denninger.net ---
(In reply to Daniel Ylitalo from comment #30)

This has ALWAYS been dangerous on a disk that is >2Tb; the solution is to place
the boot (or boot/root, if they're on the same filesystem) within the first 2Tb
and do *not* allow the size of that filesystem to cross the 2Tb boundary.  This
is an especially nasty problem because it appears that all is ok and is for a
while, right up until the system starts allocating space beyond the boundary
when you do an update... then you are suddenly hosed as the machine will not
boot.

It is safe to have root/boot on a disk larger than 2Tb, but *not* to allow the
size of that filesystem to extend across that boundary.

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