Date: Tue, 7 Dec 2010 12:44:02 GMT From: Martin Simmons <martin@lispworks.com> To: freebsd-fs@freebsd.org Subject: Re: auto-mounting ZFS snapshots Message-ID: <201012071244.oB7Ci2AD006887@higson.cam.lispworks.com> In-Reply-To: <AANLkTikUcxCmtZObc_XaU9YVWVQDySMBTNB%2B1=8yvatn@mail.gmail.com> (message from Freddie Cash on Mon, 6 Dec 2010 13:31:14 -0800) References: <4524EE89-E0A2-4CCF-92F9-80BB709C4BF6@patpro.net> <AANLkTikNJuJPMJ5Ktwi6TiOjCBr7WGrPN5UfJswAbfCw@mail.gmail.com> <DCA2288C-81EF-453D-9DC9-25A54F4C69A7@patpro.net> <4CFD558C.2060202@DataIX.net> <AANLkTikUcxCmtZObc_XaU9YVWVQDySMBTNB%2B1=8yvatn@mail.gmail.com>
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>>>>> On Mon, 6 Dec 2010 13:31:14 -0800, Freddie Cash said: > > On Mon, Dec 6, 2010 at 1:28 PM, jhell <jhell@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
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