Date: Sun, 30 May 2010 20:55:43 -0400 From: Gary Palmer <gpalmer@freebsd.org> To: David Magda <dmagda@ee.ryerson.ca> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: Make ZFS auto-destroy snapshots when the out of space? Message-ID: <20100531005543.GA77116@in-addr.com> In-Reply-To: <4632C12D-2B1E-4073-B2C9-E9D15C212EF1@ee.ryerson.ca> References: <4C017419.9010909@strauser.com> <4632C12D-2B1E-4073-B2C9-E9D15C212EF1@ee.ryerson.ca>
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On Sun, May 30, 2010 at 08:33:40PM -0400, David Magda wrote: > On May 29, 2010, at 16:07, Kirk Strauser wrote: > > >I'd propose standardizing on an attribute like > >org.freebsd:allowautodestroy. Modify ZFS's disk full behavior [...] > >Also run a daily periodic script to ensure that the free space stays > >below a configurable threshold each day so that ZFS isn't constantly > >butting up against completely full drives. > > > Why not simply have a script that runs and checks for pool usage and > then deletes snapshots with that attribute if necessary? Why do you > need to have have it built into ZFS? Suggestion: zfs can have settings that trigger an event to be delivered to devd when a filesystem hits a certain percentage full (or under a certain percentage free space left). That way you can have the event triggered at the filesystem level, which I believe is the correct thing to do (so you're not polling), and also delivers the level of control you want. Regards, Gary
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