Date: Sat, 28 Mar 2020 15:36:20 +0000 From: Graham Perrin <grahamperrin@gmail.com> To: Allan Jude <allanjude@freebsd.org> Cc: freebsd-current@freebsd.org Subject: Re: ZFS: destroying snapshots without compromising boot environments Message-ID: <01524fd0-ae7b-028b-6259-5da485b48886@gmail.com> In-Reply-To: <1c2b71fa-b25c-21d4-2115-ddb3d7b129b2@freebsd.org> References: <14266e74-e2cc-ec14-187a-4bc9c9e6c32a@gmail.com> <1c2b71fa-b25c-21d4-2115-ddb3d7b129b2@freebsd.org>
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On 28/03/2020 15:19, Allan Jude wrote: > You can try to destroy the snapshot, if it is the basis of a clone, then > you will get an error, that you'd need to destroy the BE first, so you > might decide to keep that snapshot. As long as you don't use the -R flag > to zfs destroy dataset@snapshot, it will not destroy the clones. > > You can also use 'zfs promote' to make the clone into the parent, making > the original parent into the clone. This allows you to destroy that > original and the snapshot while keeping the clone. Perfect, thank you. I was nervous about destruction without warning. Below, are the differences (in measurement) between beadm and bectl to be expected? ---- root@momh167-gjp4-8570p:~ # beadm list BE Active Mountpoint Space Created Waterfox - - 15.9G 2020-03-10 18:24 r357746f - - 1.3G 2020-03-20 06:19 r359249b NR / 74.7G 2020-03-28 01:19 root@momh167-gjp4-8570p:~ # beadm list -aDs BE/Dataset/Snapshot Active Mountpoint Space Created Waterfox copperbowl/ROOT/Waterfox - - 137.0M 2020-03-10 18:24 r359249b@2020-03-17-21:57:17 - - 59.2G 2020-03-17 21:57 copperbowl/ROOT/Waterfox@2020-03-20-06:19:45 - - 67.0M 2020-03-20 06:19 r357746f copperbowl/ROOT/r357746f - - 1.2G 2020-03-20 06:19 Waterfox@2020-03-20-06:19:45 - - 59.2G 2020-03-20 06:19 r359249b copperbowl/ROOT/r359249b@2020-03-17-21:57:17 - - 15.7G 2020-03-17 21:57 copperbowl/ROOT/r359249b NR / 59.0G 2020-03-28 01:19 root@momh167-gjp4-8570p:~ # bectl list BE Active Mountpoint Space Created Waterfox - - 204M 2020-03-10 18:24 r357746f - - 1.21G 2020-03-20 06:19 r359249b NR / 74.7G 2020-03-28 01:19 root@momh167-gjp4-8570p:~ # bectl list -aDs BE/Dataset/Snapshot Active Mountpoint Space Created Waterfox copperbowl/ROOT/Waterfox - - 204M 2020-03-10 18:24 Waterfox@2020-03-20-06:19:45 - - 67.0M 2020-03-20 06:19 r357746f copperbowl/ROOT/r357746f - - 1.21G 2020-03-20 06:19 r359249b copperbowl/ROOT/r359249b NR / 74.7G 2020-03-28 01:19 r359249b@2020-03-17-21:57:17 - - 15.7G 2020-03-17 21:57 root@momh167-gjp4-8570p:~ # zfs list -t snapshot NAME USED AVAIL REFER MOUNTPOINT copperbowl/ROOT/Waterfox@2020-03-20-06:19:45 67.0M - 59.2G - copperbowl/ROOT/r359249b@2020-03-17-21:57:17 15.7G - 59.2G - copperbowl/iocage/releases/12.0-RELEASE/root@jbrowsers 8K - 1.24G - copperbowl/poudriere/jails/head@clean 328K - 1.89G - root@momh167-gjp4-8570p:~ # zfs destroy copperbowl/ROOT/r359249b@2020-03-17-21:57:17 cannot destroy 'copperbowl/ROOT/r359249b@2020-03-17-21:57:17': snapshot has dependent clones use '-R' to destroy the following datasets: copperbowl/ROOT/r357746f copperbowl/ROOT/Waterfox@2020-03-20-06:19:45 copperbowl/ROOT/Waterfox root@momh167-gjp4-8570p:~ # date ; uname -v Sat Mar 28 15:30:57 GMT 2020 FreeBSD 13.0-CURRENT #1 r359249: Tue Mar 24 00:12:27 GMT 2020 root@momh167-gjp4-8570p:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG root@momh167-gjp4-8570p:~ #
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