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[79.66.147.78]) by smtp.gmail.com with ESMTPSA id l12sm11573155wrt.73.2020.03.28.00.24.17 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 28 Mar 2020 00:24:17 -0700 (PDT) To: freebsd-current@freebsd.org From: Graham Perrin Subject: ZFS: destroying snapshots without compromising boot environments Message-ID: <14266e74-e2cc-ec14-187a-4bc9c9e6c32a@gmail.com> Date: Sat, 28 Mar 2020 07:24:17 +0000 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Rspamd-Queue-Id: 48q9G63Rdmz4DD4 X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=qilKZ2O4; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of grahamperrin@gmail.com designates 2a00:1450:4864:20::433 as permitted sender) smtp.mailfrom=grahamperrin@gmail.com X-Spamd-Result: default: False [-3.00 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36:c]; FREEMAIL_FROM(0.00)[gmail.com]; TO_DN_NONE(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RECEIVED_SPAMHAUS_PBL(0.00)[78.147.66.79.khpj7ygk5idzvmvt5x4ziurxhy.zen.dq.spamhaus.net : 127.0.0.10]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; MID_RHS_MATCH_FROM(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com.dwl.dnswl.org : 127.0.5.0]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; IP_SCORE_FREEMAIL(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; IP_SCORE(0.00)[ip: (-9.09), ipnet: 2a00:1450::/32(-2.38), asn: 15169(-0.47), country: US(-0.05)]; RCVD_IN_DNSWL_NONE(0.00)[3.3.4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.4.6.8.4.0.5.4.1.0.0.a.2.list.dnswl.org : 127.0.5.0]; RCVD_TLS_ALL(0.00)[] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 28 Mar 2020 07:24:42 -0000 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@2020-03-20-06:19:45            67.0M -  59.2G  - copperbowl/ROOT/r359249b@2019-08-18-04:04:53            5.82G -  40.9G  - copperbowl/ROOT/r359249b@2019-08-18-11:28:31            4.32G -  40.7G  - copperbowl/ROOT/r359249b@2019-09-13-18:45:27-0          9.43G -  43.4G  - copperbowl/ROOT/r359249b@2019-09-19-20:03:26            5.13G -  43.3G  - copperbowl/ROOT/r359249b@2019-09-24-20:45:59-0          7.67G -  44.6G  - copperbowl/ROOT/r359249b@2020-01-09-17:05:57-0          7.66G -  55.2G  - copperbowl/ROOT/r359249b@2020-01-11-14:15:47            7.41G -  56.2G  - copperbowl/ROOT/r359249b@2020-03-17-21:57:17            12.0G -  59.2G  - copperbowl/iocage/releases/12.0-RELEASE/root@jbrowsers     8K -  1.24G  - copperbowl/poudriere/jails/head@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@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@2019-08-18-04:04:53   - -            5.8G 2019-08-18 04:04   copperbowl/ROOT/r359249b@2019-08-18-11:28:31   - -            4.3G 2019-08-18 11:28   copperbowl/ROOT/r359249b@2019-09-13-18:45:27-0 - -            9.4G 2019-09-13 18:45   copperbowl/ROOT/r359249b@2019-09-19-20:03:26   - -            5.1G 2019-09-19 20:03   copperbowl/ROOT/r359249b@2019-09-24-20:45:59-0 - -            7.7G 2019-09-24 20:45   copperbowl/ROOT/r359249b@2020-01-09-17:05:57-0 - -            7.7G 2020-01-09 17:05   copperbowl/ROOT/r359249b@2020-01-11-14:15:47   - -            7.4G 2020-01-11 14:15   copperbowl/ROOT/r359249b@2020-03-17-21:57:17   - -           12.0G 2020-03-17 21:57   copperbowl/ROOT/r359249b                       NR /           59.0G 2020-03-28 01:19 $