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2021-12-03T15:18:19.499269Z
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V 861
gvinum: add deprecation notice

Vinum is a Logical Volume Manager that was introduced in FreeBSD 3.0,
and for FreeBSD 5 was ported to geom(4) as gvinum. gvinum has had no
specific development at least as far back as 2010, and has a number of
known bugs which are unlikely to be resolved.

Add a deprecation notice to raise awareness but state that vinum "may
not be" available in FreeBSD 14.  Either it will be removed and the
notice will be updated to "is not" available, or someone will step up
to fix issues and maintain it and we will remove the notice.

Reviewed by:	imp (earlier version)
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D29424

(cherry picked from commit b218441ac074d9cb9417e284980bf87f79a89585)

Git Hash:   3664eb6ff7fa7161fb346c2b7c24c919d84ad6dd
Git Author: emaste@FreeBSD.org
END