由于服务器卡死，强制重启后，系统只能进入emergency mode，
通过提示的命令journalctl -xb 查看日志
juli 09 15:40:16 kim-SSD-Sationary systemd-fsck[414]: /dev/sdb1 contains a file system with errors, check forced.
juli 09 15:40:16 kim-SSD-Sationary systemd-fsck[414]: /dev/sdb1: Inodes that were part of a corrupted orphan linked list found.
juli 09 15:40:16 kim-SSD-Sationary systemd-fsck[414]: /dev/sdb1: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.发现是挂载的挂载不上/dev/sdb1而导致系统无法正常启动，
还提示说运行
RUN fsck MANUALLY于是，先修改/etc/fstab，取消开机挂载/dev/sdb1,尝试开机
vi /etc/fstab #注释掉自动挂载/dev/sdb1的那行reboot
重启正常进入系统
挂载/dev/sdb1会提示 can't read superblock on /dev/sda1
乖乖按照提示，fsck 检查修复磁盘
sudo fsck /dev/sdb1 -y
漫长等待后，重新修改 /etc/fstab 后 mount -a 就好了
如果有提示
mount.nfs: Stale file handle
就
sudo umount -lf /mnt