好吧，这让我很抓狂。在系统上运行 zfs，我的根分区似乎毫无原因地缩小了。现在我的空间已经用完了，而且找不到所有东西都去了哪里。
简单df展示如下：
[root@SV02 /]# df -h
Filesystem Size Used Available Capacity Mounted on
rpool/ROOT/opus-2457409-2017-11-07-release
90G 6.6G 35G 16% /
swap 11G 404K 11G 1% /etc/svc/volatile
...
/usr/lib/libc/libc_hwcap1.so.1
41G 6.6G 35G 16% /lib/libc.so.1
...
swap 11G 4K 11G 1% /tmp
swap 11G 60K 11G 1% /var/run
rpool/export 90G 32K 35G 1% /export
rpool/export/home 90G 86K 35G 1% /export/home
rpool/export/home/open 90G 404M 35G 2% /export/home/open
rpool 90G 43K 35G 1% /rpool
已使用/可用似乎不一致...尝试追踪它：
[root@SV02 /]# du -sh * | sort -h | tail -10
10M root
48M lib
58M etc
141M kernel
174M platform
405M export
1.5G opt
1.5G usr
3.1G var
3.6G proc
好的，那里只有几 GB 的数据...以为可能是快照，但事实似乎并非如此：
[root@SV02 /]# zfs list -t all
NAME USED AVAIL REFER MOUNTPOINT
rpool 55.5G 34.6G 43.5K /rpool
rpool/ROOT 38.6G 34.6G 31K legacy
rpool/ROOT/C_Backup1 1.24M 34.6G 5.61G /
rpool/ROOT/C_backup2 1.33M 34.6G 5.61G /
rpool/ROOT/napp-it-0.8l3 3.00M 34.6G 2.10G /
rpool/ROOT/napp-it-0.9e1 1.66M 34.6G 5.61G /
rpool/ROOT/nfsv4 54K 34.6G 2.11G /
rpool/ROOT/openindiana 18.3M 34.6G 2.02G /
rpool/ROOT/opus-2457044-2015-01-31-install 65.4M 34.6G 31.6G /a
rpool/ROOT/opus-2457044-2015-01-31-preinstall 1K 34.6G 5.61G /
rpool/ROOT/opus-2457044-2015-05-19-pre15 45K 34.6G 6.32G /
rpool/ROOT/opus-2457044-2016-10-03-backup 52K 34.6G 31.3G /
rpool/ROOT/opus-2457409-2016-10-04-install 15.5M 34.6G 31.7G /a
rpool/ROOT/opus-2457409-2016-10-04-preinstall 52K 34.6G 31.5G /
rpool/ROOT/opus-2457409-2017-11-07-release 38.5G 34.6G 6.57G /
rpool/ROOT/opus-2457409-2017-11-07-release@install 4.40M - 1.56G -
rpool/ROOT/opus-2457409-2017-11-07-release@2014-02-25-22:01:25 6.64M - 1.58G -
rpool/ROOT/opus-2457409-2017-11-07-release@2014-02-25-22:05:33 84.6M - 2.02G -
rpool/ROOT/opus-2457409-2017-11-07-release@2014-03-19-23:25:59 58.0M - 2.11G -
rpool/ROOT/opus-2457409-2017-11-07-release@2014-04-12-17:55:40 0 - 2.10G -
rpool/ROOT/opus-2457409-2017-11-07-release@2014-04-12-17:55:48 0 - 2.10G -
rpool/ROOT/opus-2457409-2017-11-07-release@2014-04-12-18:13:10 1.44M - 2.10G -
rpool/ROOT/opus-2457409-2017-11-07-release@2014-04-12-18:14:31 2.17M - 2.12G -
rpool/ROOT/opus-2457409-2017-11-07-release@2015-01-31-21:55:47 15.3M - 5.61G -
rpool/ROOT/opus-2457409-2017-11-07-release@2015-01-31-22:34:52 9.18M - 5.61G -
rpool/ROOT/opus-2457409-2017-11-07-release@2015-01-31-22:43:54 362K - 5.61G -
rpool/ROOT/opus-2457409-2017-11-07-release@2015-01-31-22:44:05 362K - 5.61G -
rpool/ROOT/opus-2457409-2017-11-07-release@2015-05-19-21:49:36 227M - 6.32G -
rpool/ROOT/opus-2457409-2017-11-07-release@2016-10-04-16:11:30 3.15M - 31.3G -
rpool/ROOT/opus-2457409-2017-11-07-release@2016-10-04-16:34:30 936K - 31.5G -
rpool/ROOT/opus-2457409-2017-11-07-release@2016-10-04-16:34:42 986K - 31.5G -
rpool/ROOT/opus-2457409-2017-11-07-release@2016-10-04-16:53:00 112M - 31.8G -
rpool/ROOT/pre_napp-it-0.8l3 35K 34.6G 1.58G /
rpool/ROOT/pre_napp-it-0.9e1 71K 34.6G 2.10G /
rpool/ROOT/sv02-4-10-14 70K 34.6G 2.10G /
rpool/ROOT/sv02-4-10-14-v2 4.17M 34.6G 2.12G /
rpool/dump 8.00G 34.6G 8.00G -
rpool/export 404M 34.6G 32K /export
rpool/export/home 404M 34.6G 86.5K /export/home
rpool/export/home/open 404M 34.6G 404M /export/home/open
rpool/swap 8.50G 43.0G 132M -
有 34 GB 可用，但我不知道在哪里？不知所措，不幸的是，我对 zfs 的了解还不够，无法正确排除故障。重启后仍然存在，我最近没有删除任何大文件或任何东西，所以不要认为这是一个保留任何东西的过程……任何指导都将不胜感激。
添加：
[root@SV02 /]# zfs list -t all
NAME USED AVAIL REFER MOUNTPOINT
rpool 23.5G 66.6G 43.5K /rpool
rpool/ROOT 6.58G 66.6G 31K legacy
rpool/ROOT/opus-2457409-2017-11-07-release 6.58G 66.6G 6.58G /
rpool/dump 8.00G 66.6G 8.00G -
rpool/export 404M 66.6G 32K /export
rpool/export/home 404M 66.6G 86.5K /export/home
rpool/export/home/open 404M 66.6G 404M /export/home/open
rpool/swap 8.50G 75.0G 132M -
答案1
看起来有几个“叶节点”数据集（没有子数据集）占据了磁盘使用量的大部分rpool：
rpool/ROOT/opus-2457409-2017-11-07-release 38.5G
rpool/dump 8.00G
rpool/swap 8.50G
总计为 55G，与 报告的 55.5G 非常接近rpool。USED大概您想保留rpool/dump和rpool/swap定义它们现在的样子，这样就只剩下rpool/ROOT/opus-...-11-07-release您可以从中删除内容以释放空间的东西了。
出于某种我不明白的原因，在您的输出中，该数据集的挂载点列为/，但在许多其他数据集中也是如此。您实际上无法将多个文件系统挂载到同一个目录，因此显然那里有些混乱。尝试创建一个新目录，zfs mount将数据集挂载在那里，用 标识要从中删除的内容du，然后删除一些文件。
不幸的是，当您删除那里的东西时，您很快就会意识到它没有释放任何空间，这是因为您也拥有该数据集的一堆快照：
rpool/ROOT/opus-2457409-2017-11-07-release 38.5G 34.6G 6.57G /
rpool/ROOT/opus-2457409-2017-11-07-release@install 4.40M - 1.56G -
rpool/ROOT/opus-2457409-2017-11-07-release@2014-02-25-22:01:25 6.64M - 1.58G -
rpool/ROOT/opus-2457409-2017-11-07-release@2014-02-25-22:05:33 84.6M - 2.02G -
rpool/ROOT/opus-2457409-2017-11-07-release@2014-03-19-23:25:59 58.0M - 2.11G -
rpool/ROOT/opus-2457409-2017-11-07-release@2014-04-12-17:55:40 0 - 2.10G -
rpool/ROOT/opus-2457409-2017-11-07-release@2014-04-12-17:55:48 0 - 2.10G -
rpool/ROOT/opus-2457409-2017-11-07-release@2014-04-12-18:13:10 1.44M - 2.10G -
rpool/ROOT/opus-2457409-2017-11-07-release@2014-04-12-18:14:31 2.17M - 2.12G -
rpool/ROOT/opus-2457409-2017-11-07-release@2015-01-31-21:55:47 15.3M - 5.61G -
rpool/ROOT/opus-2457409-2017-11-07-release@2015-01-31-22:34:52 9.18M - 5.61G -
rpool/ROOT/opus-2457409-2017-11-07-release@2015-01-31-22:43:54 362K - 5.61G -
rpool/ROOT/opus-2457409-2017-11-07-release@2015-01-31-22:44:05 362K - 5.61G -
rpool/ROOT/opus-2457409-2017-11-07-release@2015-05-19-21:49:36 227M - 6.32G -
rpool/ROOT/opus-2457409-2017-11-07-release@2016-10-04-16:11:30 3.15M - 31.3G -
rpool/ROOT/opus-2457409-2017-11-07-release@2016-10-04-16:34:30 936K - 31.5G -
rpool/ROOT/opus-2457409-2017-11-07-release@2016-10-04-16:34:42 986K - 31.5G -
rpool/ROOT/opus-2457409-2017-11-07-release@2016-10-04-16:53:00 112M - 31.8G -
具体来说，请查看最后一个快照，@2016-10-04-16:53:00总共 38.5G 中的 31.8G 将由该快照保留。看起来大部分使用量至少可以追溯到@2016-10-04-16:11:30，因此您还需要删除（至少）这些快照以恢复大部分数据：
rpool/ROOT/opus-2457409-2017-11-07-release@2016-10-04-16:11:30 3.15M - 31.3G -
rpool/ROOT/opus-2457409-2017-11-07-release@2016-10-04-16:34:30 936K - 31.5G -
rpool/ROOT/opus-2457409-2017-11-07-release@2016-10-04-16:34:42 986K - 31.5G -
rpool/ROOT/opus-2457409-2017-11-07-release@2016-10-04-16:53:00 112M - 31.8G -
如果您不需要更旧的快照，您也可以删除它们。一般建议，最好只在需要时保留快照，而不是无限期地保留，因为您最终会意外地在其中一个快照中捕获一些重要信息，并陷入这种情况。