auto-mounting ZFS snapshots

[Martin Simmons]

>>>>> On Mon, 6 Dec 2010 13:31:14 -0800, Freddie Cash said:
> 
> On Mon, Dec 6, 2010 at 1:28 PM, jhell <jhell at dataix.net> wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > On 12/06/2010 16:13, Patrick Proniewski wrote:
> >> On 6 déc. 2010, at 18:20, Freddie Cash wrote:
> >>
> >>> FreeBSD automounts the "hidden" .zfs filesystem hierarchy where
> >>> snapshots are "stored" automatically.  No need for amd.
> >>
> >> The zfs man page reads:
> >>
> >> File  system snapshots can be accessed under the ".zfs/snapshot"
> >> direc- tory in the root  of  the  file  system.  Snapshots  are
> >> automatically mounted  on demand and may be unmounted at regular
> >> intervals. The visi- bility of the ".zfs" directory can be controlled
> >> by the "snapdir" prop- erty.
> >>
> >> "may be unmounted at regular intervals" <-- what about this? Do I
> >> have to create a periodic script that'll unmount snapshots? And if
> >> so, how can I make a script that'll unmount only snapshots mounted
> >> for over, say, 1 hour?
> >
> > No this is a no worry type of thing. This is a transparent process that
> > handles what is available. Just consider them mounted all the time but
> > you will not see them.
> >
> > Play with it a little and see what it looks like. mount(1) will not even
> > show them as mounted so there is no worries here. The correct thing
> > happens to keep you from shooting yourself in the foot.
> 
> Oh, that's right.  Mount was updated in 8.x to not show ZFS snapshots,
> so you don't even have to worry about it anymore.
> 
> My previous reply applies to 7.x, though (which is what's running on
> one of our backups boxes).

In 8.0 at least, they are still shown in the output of
/etc/periodic/security/200.chkmounts by default.

__Martin