ZFS: destroying snapshots without compromising boot environments

[Andrey Fesenko]

On Sat, Mar 28, 2020 at 10:30 AM Graham Perrin <grahamperrin at gmail.com> wrote:
>
> I imagine that some of the 2019 snapshots below are redundant.
>
> Can I safely destroy any of them?
>
> $ zfs list -t snapshot
> NAME                                                     USED AVAIL
> REFER  MOUNTPOINT
> copperbowl/ROOT/Waterfox at 2020-03-20-06:19:45            67.0M -  59.2G  -
> copperbowl/ROOT/r359249b at 2019-08-18-04:04:53            5.82G -  40.9G  -
> copperbowl/ROOT/r359249b at 2019-08-18-11:28:31            4.32G -  40.7G  -
> copperbowl/ROOT/r359249b at 2019-09-13-18:45:27-0          9.43G -  43.4G  -
> copperbowl/ROOT/r359249b at 2019-09-19-20:03:26            5.13G -  43.3G  -
> copperbowl/ROOT/r359249b at 2019-09-24-20:45:59-0          7.67G -  44.6G  -
> copperbowl/ROOT/r359249b at 2020-01-09-17:05:57-0          7.66G -  55.2G  -
> copperbowl/ROOT/r359249b at 2020-01-11-14:15:47            7.41G -  56.2G  -
> copperbowl/ROOT/r359249b at 2020-03-17-21:57:17            12.0G -  59.2G  -
> copperbowl/iocage/releases/12.0-RELEASE/root at jbrowsers     8K -  1.24G  -
> copperbowl/poudriere/jails/head at clean                    328K -  1.89G  -
> $ beadm list
> BE       Active Mountpoint  Space Created
> Waterfox -      -           12.2G 2020-03-10 18:24
> r357746f -      -            1.3G 2020-03-20 06:19
> r359249b NR     /          148.9G 2020-03-28 01:19
> $ beadm list -aDs
> BE/Dataset/Snapshot                              Active Mountpoint
> Space Created
>
> Waterfox
>    copperbowl/ROOT/Waterfox                       -      - 137.0M
> 2020-03-10 18:24
>      r359249b at 2020-03-17-21:57:17                 - -           59.2G
> 2020-03-17 21:57
>    copperbowl/ROOT/Waterfox at 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 at 2020-03-20-06:19:45                 - -           59.2G
> 2020-03-20 06:19
>
> r359249b
>    copperbowl/ROOT/r359249b at 2019-08-18-04:04:53   - -            5.8G
> 2019-08-18 04:04
>    copperbowl/ROOT/r359249b at 2019-08-18-11:28:31   - -            4.3G
> 2019-08-18 11:28
>    copperbowl/ROOT/r359249b at 2019-09-13-18:45:27-0 - -            9.4G
> 2019-09-13 18:45
>    copperbowl/ROOT/r359249b at 2019-09-19-20:03:26   - -            5.1G
> 2019-09-19 20:03
>    copperbowl/ROOT/r359249b at 2019-09-24-20:45:59-0 - -            7.7G
> 2019-09-24 20:45
>    copperbowl/ROOT/r359249b at 2020-01-09-17:05:57-0 - -            7.7G
> 2020-01-09 17:05
>    copperbowl/ROOT/r359249b at 2020-01-11-14:15:47   - -            7.4G
> 2020-01-11 14:15
>    copperbowl/ROOT/r359249b at 2020-03-17-21:57:17   - -           12.0G
> 2020-03-17 21:57
>    copperbowl/ROOT/r359249b                       NR /           59.0G
> 2020-03-28 01:19
> $


beadm destroy ? ;)