[Bug 271989] zfs root mount error 6 after upgrade from 11.1-release to 13.2-release

From: <bugzilla-noreply_at_freebsd.org>
Date: Fri, 23 Jun 2023 06:57:47 UTC

--- Comment #15 from Markus Wild <freebsd-bugs@virtualtec.ch> ---
thank you for the references to the label definition, looks like I
guessed correctly from ktrace on zdb -l 

about labelclear: the man page for this potentially very destructive
command is very short. It currently just says 
"Removes ZFS label information from the specified device". It's 
great to see it's just clearing what zdb -l would list.

Considering I was not the first to be uncertain what that means
if the "device" is a whole-disk-device, it would help to add something
to the man page like "If the device refers to a whole disk, not a partition,
only label entries at the beginning and end of the disk are acted upon,
individual partitions are not affected as long as they don't overlap with
the beginning and end of the disk".

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