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From: Freddie Cash <fjwcash@gmail.com>
Date: Fri, 2 Mar 2018 16:09:34 -0800
Message-ID: <CAOjFWZ6J7UV_xXxtASqnonS8qatqaSSEqJUKyi9nw+ms+Ug1QQ@mail.gmail.com>
Subject: Re: zfs problems after rebuilding system
To: tech-lists <tech-lists@zyxst.net>
Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org>,
 FreeBSD Stable <freebsd-stable@freebsd.org>
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You said it's an external USB drive, correct? Could it be a race condition
during the boot process where the USB mass storage driver hasn't detected
the drive yet when /etc/rc.d/zfs is run?

As a test, add a "sleep 30" in that script before the "zfs mount -a" call
and reboot.

Cheers,
Freddie

Typos courtesy of my phone.