FreeBSD Mail Archives

Date:      Sat, 28 Mar 2020 11:19:21 -0400
From:      Allan Jude <allanjude@freebsd.org>
To:        freebsd-current@freebsd.org
Cc:        Graham Perrin <grahamperrin@gmail.com>
Subject:   Re: ZFS: destroying snapshots without compromising boot environments
Message-ID:  <1c2b71fa-b25c-21d4-2115-ddb3d7b129b2@freebsd.org>
In-Reply-To: <14266e74-e2cc-ec14-187a-4bc9c9e6c32a@gmail.com>
References:  <14266e74-e2cc-ec14-187a-4bc9c9e6c32a@gmail.com>

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From: Allan Jude <allanjude@freebsd.org>
To: freebsd-current@freebsd.org
Cc: Graham Perrin <grahamperrin@gmail.com>
Message-ID: <1c2b71fa-b25c-21d4-2115-ddb3d7b129b2@freebsd.org>
Subject: Re: ZFS: destroying snapshots without compromising boot environments
References: <14266e74-e2cc-ec14-187a-4bc9c9e6c32a@gmail.com>
In-Reply-To: <14266e74-e2cc-ec14-187a-4bc9c9e6c32a@gmail.com>

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On 2020-03-28 03:24, Graham Perrin wrote:
> I imagine that some of the 2019 snapshots below are redundant.
>=20
> Can I safely destroy any of them?
>=20
> $ zfs list -t snapshot
> NAME=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 USED AVAIL=C2=A0
> REFER=C2=A0 MOUNTPOINT
> copperbowl/ROOT/Waterfox@2020-03-20-06:19:45=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 67.0M -=C2=A0 59.2G=C2=A0 -
> copperbowl/ROOT/r359249b@2019-08-18-04:04:53=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 5.82G -=C2=A0 40.9G=C2=A0 -
> copperbowl/ROOT/r359249b@2019-08-18-11:28:31=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 4.32G -=C2=A0 40.7G=C2=A0 -
> copperbowl/ROOT/r359249b@2019-09-13-18:45:27-0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 9.43G -=C2=A0 43.4G=C2=A0 -
> copperbowl/ROOT/r359249b@2019-09-19-20:03:26=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 5.13G -=C2=A0 43.3G=C2=A0 -
> copperbowl/ROOT/r359249b@2019-09-24-20:45:59-0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 7.67G -=C2=A0 44.6G=C2=A0 -
> copperbowl/ROOT/r359249b@2020-01-09-17:05:57-0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 7.66G -=C2=A0 55.2G=C2=A0 -
> copperbowl/ROOT/r359249b@2020-01-11-14:15:47=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 7.41G -=C2=A0 56.2G=C2=A0 -
> copperbowl/ROOT/r359249b@2020-03-17-21:57:17=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 12.0G -=C2=A0 59.2G=C2=A0 -
> copperbowl/iocage/releases/12.0-RELEASE/root@jbrowsers=C2=A0=C2=A0=C2=A0=
=C2=A0 8K -=C2=A0 1.24G=C2=A0 -
> copperbowl/poudriere/jails/head@clean=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0 328K -=C2=A0 1.89G=C2=A0 -
> $ beadm list
> BE=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Active Mountpoint=C2=A0 Space Cr=
eated
> Waterfox -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 12.2G 2020-03-10 18:24
> r357746f -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1.3G 2020-03-20 06:19
> r359249b NR=C2=A0=C2=A0=C2=A0=C2=A0 /=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 148.9G 2020-03-28 01:19
> $ beadm list -aDs
> BE/Dataset/Snapshot=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Active Mountpoint=C2=A0
> Space Created
>=20
> Waterfox
> =C2=A0 copperbowl/ROOT/Waterfox=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 - 137.0M
> 2020-03-10 18:24
> =C2=A0=C2=A0=C2=A0 r359249b@2020-03-17-21:57:17=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
- -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 59.2G
> 2020-03-17 21:57
> =C2=A0 copperbowl/ROOT/Waterfox@2020-03-20-06:19:45=C2=A0=C2=A0 - -=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 67.0M
> 2020-03-20 06:19
>=20
> r357746f
> =C2=A0 copperbowl/ROOT/r357746f=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 - -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 1.2G
> 2020-03-20 06:19
> =C2=A0=C2=A0=C2=A0 Waterfox@2020-03-20-06:19:45=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
- -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 59.2G
> 2020-03-20 06:19
>=20
> r359249b
> =C2=A0 copperbowl/ROOT/r359249b@2019-08-18-04:04:53=C2=A0=C2=A0 - -=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 5.8G
> 2019-08-18 04:04
> =C2=A0 copperbowl/ROOT/r359249b@2019-08-18-11:28:31=C2=A0=C2=A0 - -=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 4.3G
> 2019-08-18 11:28
> =C2=A0 copperbowl/ROOT/r359249b@2019-09-13-18:45:27-0 - -=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 9.4G
> 2019-09-13 18:45
> =C2=A0 copperbowl/ROOT/r359249b@2019-09-19-20:03:26=C2=A0=C2=A0 - -=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 5.1G
> 2019-09-19 20:03
> =C2=A0 copperbowl/ROOT/r359249b@2019-09-24-20:45:59-0 - -=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 7.7G
> 2019-09-24 20:45
> =C2=A0 copperbowl/ROOT/r359249b@2020-01-09-17:05:57-0 - -=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 7.7G
> 2020-01-09 17:05
> =C2=A0 copperbowl/ROOT/r359249b@2020-01-11-14:15:47=C2=A0=C2=A0 - -=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 7.4G
> 2020-01-11 14:15
> =C2=A0 copperbowl/ROOT/r359249b@2020-03-17-21:57:17=C2=A0=C2=A0 - -=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 12.0G
> 2020-03-17 21:57
> =C2=A0 copperbowl/ROOT/r359249b=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 NR /=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 59.0G
> 2020-03-28 01:19
> $
>=20
> _______________________________________________
> freebsd-current@freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-current
> To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.o=
rg"


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.


--=20
Allan Jude


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