From owner-freebsd-questions@freebsd.org  Sat Feb  4 19:42:13 2017
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Date: Sat, 4 Feb 2017 11:42:07 -0800 (PST)
From: Roger Marquis <marquis@roble.com>
To: freebsd-questions@freebsd.org
Subject: Disappearing /dev/diskid/DISK*
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What would cause these entries be disappearing and reappearing, several
days apart, on an 11.0-RELEASE-p6 system with ZFS root?

Roger