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Date: Wed, 17 Jan 2018 08:10:06 +0100
From: Marko Turk <markoml@markoturk.info>
To: Victor Sudakov <vas@mpeks.tomsk.su>
Cc: freebsd-questions@freebsd.org
Subject: Re: Dualboot and ZFS
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Hi,

On Tue, Jan 16, 2018 at 11:52:06PM +0700, Victor Sudakov wrote:
> Marko Turk wrote:
> > since zroot/usr is not mounted, path /usr/bin/* in the filesystem
> > belongs to dataset zroot/ROOT/some_test_be=20
>=20
> But why is that? This must be witchcraft :-)
>=20
> Why does it not belong to dataset "zroot", or dataset
> "zroot/ROOT/some_other_great_be"?=20
>=20
> Is it because zroot/ROOT/some_test_be is mounted on / ?

Yes, exactly.

>=20
> > so that's why the files are
> > there.
> >=20
> > E.g.:
> > $ df -h /usr/bin/
> > Filesystem            Size    Used   Avail Capacity  Mounted on
> > zroot/ROOT/default    504G     19G    485G     4%    /
> >=20
>=20
> Very demonstrative, thank you, but what makes "zroot/ROOT/default" and
> not any other dataset the container for the files in /usr/bin/ ?

Because of the mountpoints.

zroot/usr exists so you can create children of it which will not be in a
BE.

For example, zroot/usr/src is not a part of a BE:

$ df -h /usr/src/
Filesystem       Size    Used   Avail Capacity  Mounted on
zroot/usr/src    487G    1.6G    485G     0%    /usr/src

/Marko

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