10.1 ZFS - why canmount=off for /usr and /var by default?

[krad]

It makes a degree of sense, however what are the properties most people set
to inherit? Compression, atime, for me and I do that at the root dataset
anyway, and sometimes dedup if its an ssd based pool.

I still dont see why we set the mountpoint as this just confuses imho

On 19 February 2015 at 15:49, Trond Endrestøl <
Trond.Endrestol at fagskolen.gjovik.no> wrote:

> On Thu, 19 Feb 2015 12:06-0000, krad wrote:
>
> > It is a bit confusing, I have to ask why call it zroot/usr at all? I use
> > <pool>/os/ for stuff like ports etc and then set the mountpoint. If we
> must
> > use usr in the name why not set the mountpoint to legacy as well, as its
> > more clearly not used?
>
> Sorry for jumping in, but it's done simply to inherit the mountpoint.
>
> It has already been said, but here's a recap.
>
> Most of what you'll find in /usr belongs to the current BE. Datasets
> create below zroot/usr, e.g. zroot/usr/local, magically appears as
> /usr/foo, e.g. /usr/local. The same goes for zroot/var and /var.
>
> If you want to install FreeBSD with ZFS using some other train of
> thought, then feel free to do so.
>
> I have my own set of scripts at
> http://ximalas.info/~trond/create-zfs/canmount/, and they certainly
> have their flaws, and maybe I even change these scripts in the future
> as I move along and change my perspective on FreeBSD and ZFS.
>
> > On 15 February 2015 at 13:52, John Goerzen <jgoerzen at complete.org>
> wrote:
> >
> > > Ben Woods <woodsb02 <at> gmail.com> writes:
> > >
> > > >
> > > > To quote Allan Jude when I posed this question to him:
> > > >
> > > > "The /usr dataset has 'canmount' set to off. It only exists so that
> other
> > > > datasets can be created under it.
> > >
> > > That makes sense.  But it is misleading to have the mountpoint set to
> /usr
> > > and /var, isn't it?  In a zfs list, it looks as if it's being used for
> /usr
> > > and /var, when really as you say it's a container.
> > >
> > > I wonder - would there be a place I could submit a bug report to
> suggest
> > > that the mountpoint property be inherited at the default rather than
> set
> > > for
> > > these two filesystems?
> > >
> > > > To use boot environments, you need to install the tool from the ports
> > > tree:
> > > > sysutils/beadm-devel
> > >
> > > Interesting.  That looks quite nice.  I need to read up a bit more on
> it,
> > > clearly, since it seems to be more than just a zfs clone and zpool set
> > > bootfs that I was expecting.
> > >
> > > Thanks,
> > >
> > > John
>
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> | IT-ansvarlig,                 | System administrator,              |
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