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当服务器无法确认 zfs 数据集是否已安装时，我该如何排除故障？

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当服务器无法确认 zfs 数据集是否已安装时，我该如何排除故障？

我有一个存在于和/proc/mounts中的 ZFS 数据集/etc/mtab，但文件夹在文件系统中不存在，zfs umount报告数据集不存在，并zfs mount报告数据集已挂载。

这是在 RHEL 8.8（完全更新）上运行 zfs dkms 2.1.11-1

是否可以在不重启服务器的情况下卸载此数据集？我该如何开始解决此类问题？

我认为这种情况发生在数据集上启用 sharenfs 设置，然后zfs umount在 nfs 守护进程共享时尝试执行 a 操作时。我尝试过设置sharenfs=off（成功了，但不能解决问题）。nfs 服务已关闭，问题仍然存在。我可以将zfs send数据集传输到另一个系统并验证它们是否完好无损，但我只需要将它们安装在这服务器。

我没有使用容器或者额外的挂载命名空间（据我所知）。

坐骑列表如下/etc/mtab：/proc/mounts

topher@nzxt:/$ grep Backups -H /etc/mtab /proc/mounts
/etc/mtab:array/Backups /array/Backups zfs rw,seclabel,nosuid,nodev,noexec,noatime,xattr,noacl 0 0
/etc/mtab:array/Backups/gwen /array/Backups/gwen zfs rw,seclabel,nosuid,nodev,noexec,noatime,xattr,noacl 0 0
/proc/mounts:array/Backups /array/Backups zfs rw,seclabel,nosuid,nodev,noexec,noatime,xattr,noacl 0 0
/proc/mounts:array/Backups/gwen /array/Backups/gwen zfs rw,seclabel,nosuid,nodev,noexec,noatime,xattr,noacl 0 0

文件系统中不存在该目录

topher@nzxt:/$ ls /array/Backups
ls: cannot access '/array/Backups': No such file or directory

数据集确实存在于 zfs 中（池是array）

topher@nzxt:/$ zfs list array/Backups array/Backups/gwen
NAME                 USED  AVAIL     REFER  MOUNTPOINT
array/Backups       2.62T  1.59T     1.71T  /array/Backups
array/Backups/gwen   364G  1.59T      364G  /array/Backups/gwen

卸载（延迟、强制或其他方式）失败。

topher@nzxt:/$ sudo zfs umount array/Backups
cannot unmount '/array/Backups/gwen': no such pool or dataset

topher@nzxt:/$ sudo zfs umount array/Backups/gwen
cannot unmount '/array/Backups/gwen': no such pool or dataset

topher@nzxt:/$ sudo umount /array/Backups/gwen
umount: /array/Backups/gwen: no mount point specified.

topher@nzxt:/$ sudo umount /array/Backups
umount: /array/Backups: no mount point specified.

我也无法导出 zfs 池。

topher@nzxt:~$ sudo zpool export array
cannot unmount '/array/Backups/gwen': unmount failed

尝试重新挂载目录，但报告称该目录已挂载

topher@nzxt:/$ sudo zfs mount array/Backups
cannot mount 'array/Backups': filesystem already mounted

topher@nzxt:/$ sudo zfs mount array/Backups/gwen
cannot mount 'array/Backups/gwen': filesystem already mounted

lsof尝试遍历受影响的目录时会抛出错误，并且不会返回这些路径中任何打开的文件句柄

topher@nzxt:/$ sudo lsof | grep Backups
lsof: WARNING: can't stat() zfs file system /array/Backups
      Output information may be incomplete.
lsof: WARNING: can't stat() zfs file system /array/Backups/gwen
      Output information may be incomplete.

fuser认为该坐骑不存在

topher@nzxt:~$ sudo fuser -vm /array/Backups
Specified filename /array/Backups does not exist.
topher@nzxt:~$ sudo fuser -vm /array/Backups/gwen
Specified filename /array/Backups/gwen does not exist.

答案1

尝试一下偷懒或者强制umount，看看会发生什么？

umount -l或者umount -f

看：https://github.com/openzfs/zfs/issues/2435和Linux 挂载点无论如何都无法卸载？

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