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Date: Thu, 10 Mar 2016 01:04:37 +0100
From: Miroslav Lachman <000.fbsd@quip.cz>
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To: marquis@roble.com, freebsd-current@freebsd.org
Subject: Re: zfsboot patch for /usr
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Roger Marquis wrote on 03/10/2016 00:36:
> Wondering if anyone has example patches for zfsboot (from
> usr.sbin/bsdinstall/scripts)?
>
> We're looking to change some of the default zfs subvolumes, removing /usr in
> favor of /usr/local in particular, and have run into a "parent does not exist"
> issue.  It's not clear where in the script the /usr parent dir should be
> mkdir'd.

I no nothing about this script but if you want /usr/local as ZFS 
filesystem, then you need to create parent (/usr in this case) and you 
can use property canmount=off plus different 'mountpoint' (for example 
/mnt/usr) to not mount /usr over existing directory on root filesystem.

Miroslav Lachman