[Bug 293917] zpool with active EDONR checksum can not hold the bootfs

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293917

            Bug ID: 293917
           Summary: zpool with active EDONR checksum can not hold the
                    bootfs
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: walter.von.entferndt@posteo.net

OBSERVED:
You can not boot from a zpool with active EDONR checksum. This is not a bug by
itself, instead the bug is that it's not documented!  There is no notion of
this, neither in any zpool-* nor zfs-* manpage.  Thank you for reminding us of
the meaning of RTFSD ("read the f*ing source, dude!").  So do we have to add a
page to the UNIX Haters Handbook?  The short documentation of this newly
available checksum algorithm sounds appealing, so I guess I'm not the only one
who activated it and then had to copy all data twice...

EXPECTED:
There should be a BIG FAT WARNING in the manpages and any other documentation
where the EDONR checksum property is mentioned, that as long as just one single
block in the whole pool uses this checksum method -- regardless if it's in the
bootfs dataset or any other dataset, volume or snapshot -- renders the whole
pool unbootable.

Thx in advance for fixing this!

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