Date: Fri, 23 Feb 2018 00:00:33 +0100 From: Dave Cottlehuber <dch@skunkwerks.at> To: freebsd-questions@freebsd.org, byrnejb@harte-lyne.ca Subject: Re: Resetting zfs snapshots Message-ID: <1519340433.3372351.1280283944.09E847B7@webmail.messagingengine.com> In-Reply-To: <a4990c9f32d613211008307e23ecbc47.squirrel@webmail.harte-lyne.ca> References: <a4990c9f32d613211008307e23ecbc47.squirrel@webmail.harte-lyne.ca>
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On Thu, 22 Feb 2018, at 22:29, James B. Byrne via freebsd-questions wrote: > I am in the process of setting up a new FreeBSD server which involves > transferring a large amount of data onto. The system was installed > with root zfs and snapshots were initialised immediately. > > Several iterations of test data transfer and deletes has now resulted > in snapshots exceeding 64 Gb. I wish to effectively restart/rebase > snapshots following the final transfer and eliminate all previous > ones. > > What is the safest way to do this? -read the manpage for `zfs destroy` carefully ;-) and make a backup. start off using: zfs destroy -vn zroot/path/to/dataset@first-snapshot%last-snapshot the -n ensures it only displays what it *would* do, but actually makes no changes. the @first%last is an inclusive range so the destruction would include: - first - last - everything in between You may want -r which does this same range destruction for all child datasets. If your goal is to *recursively* nuke all snapshots prior to "now" then you can: # make a snapshot right now that will be destroyed in the inclusive range zfs snapshot -r zroot@before # this snapshot will live on in infamy long after its comrades are gone zfs snapshot -r zroot@now # use the inclusive range to trash all preceding snapshots zfs destroy -vrn zroot@%before # at this point a backup is a really good idea zfs send -LevR zroot@now > somewhere/with/space I highly recommend Jude + Lucas' zfs books, well worth every penny. Also, if you're not using boot environments, start now. they are the best thing since zfs. You have a good opportunity to test these out before your system is live. [1]: sysutils/beadm-devel [2]: http://www.callfortesting.org/bhyve-boot-environments/ A+ Dave
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