Date: Mon, 6 Dec 2010 13:31:14 -0800 From: Freddie Cash <fjwcash@gmail.com> To: jhell <jhell@dataix.net> Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org>, Patrick Proniewski <patpro@patpro.net> Subject: Re: auto-mounting ZFS snapshots Message-ID: <AANLkTikUcxCmtZObc_XaU9YVWVQDySMBTNB%2B1=8yvatn@mail.gmail.com> In-Reply-To: <4CFD558C.2060202@DataIX.net> References: <4524EE89-E0A2-4CCF-92F9-80BB709C4BF6@patpro.net> <AANLkTikNJuJPMJ5Ktwi6TiOjCBr7WGrPN5UfJswAbfCw@mail.gmail.com> <DCA2288C-81EF-453D-9DC9-25A54F4C69A7@patpro.net> <4CFD558C.2060202@DataIX.net>
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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 d=C3=A9c. 2010, at 18:20, Freddie Cash wrote: >> >>> FreeBSD automounts the "hidden" .zfs filesystem hierarchy where >>> snapshots are "stored" automatically. =C2=A0No need for amd. >> >> The zfs man page reads: >> >> File =C2=A0system snapshots can be accessed under the ".zfs/snapshot" >> direc- tory in the root =C2=A0of =C2=A0the =C2=A0file =C2=A0system. =C2= =A0Snapshots =C2=A0are >> automatically mounted =C2=A0on 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). --=20 Freddie Cash fjwcash@gmail.com
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